183-513: Hickory is a common name for trees composing the genus Carya , which includes 19 species accepted by Plants of the World Online . Seven species are native to southeast Asia in China , Indochina , and northeastern India ( Assam ), and twelve are native to North America . A number of hickory species are used for their edible nuts or for their wood. The name "hickory" derives from
366-527: A Homo erectus who used fire , have been dated to between 680,000 and 780,000 years ago . The fossilized teeth of Homo sapiens (dated to 125,000–80,000 years ago) have been discovered in Fuyan Cave . Chinese proto-writing existed in Jiahu around 6600 BCE, at Damaidi around 6000 BCE, Dadiwan from 5800 to 5400 BCE, and Banpo dating from the 5th millennium BCE. Some scholars have suggested that
549-535: A Native American word in an Algonquian language (perhaps Powhatan ). It is a shortening of pockerchicory , pocohicora , or a similar word, which may be the name for the hickory tree's nut, or may be a milky drink made from such nuts. The genus name Carya is Ancient Greek : κάρυον , káryon , meaning " nut ". Hickories are temperate to subtropical forest trees with pinnately compound leaves and large nuts . Most are deciduous , but one species ( C. sinensis , syn. Annamocarya sinensis ) in southeast Asia
732-577: A failed war in northern Korea provoked widespread unrest. Under the succeeding Tang and Song dynasties , Chinese economy, technology, and culture entered a golden age. The Tang dynasty retained control of the Western Regions and the Silk Road, which brought traders to as far as Mesopotamia and the Horn of Africa , and made the capital Chang'an a cosmopolitan urban center. However, it
915-473: A nuclear-weapon state with the world's largest standing army by military personnel and the second-largest defense budget . It is a great power , and has been described as an emerging superpower . China is known for its cuisine and culture, and has 59 UNESCO World Heritage Sites , the second-highest number of any country . The word "China" has been used in English since the 16th century; however, it
1098-409: A symbiotic relationship with Frankia species, a filamentous bacterium that can fix nitrogen from the air, converting it into ammonia . They have actinorhizal root nodules on their roots in which the bacteria live. This process enables the tree to live in low nitrogen habitats where they would otherwise be unable to thrive. The plant hormones called cytokinins initiate root nodule formation, in
1281-531: A 100 gram (3.5 oz) reference amount, dried hickory nuts supply 657 calories , and are a rich source (20% or more of the Daily Value , DV) of several B vitamins and dietary minerals , especially manganese at 220% DV. An extract from shagbark hickory bark is used in an edible syrup similar to maple syrup , with a slightly bitter, smoky taste. The Cherokee people would produce a green dye from hickory bark, which they used to dye cloth. When this bark
1464-416: A classic example of parallel evolution . With an estimated 60,000-100,000 species, the number of trees worldwide might total twenty-five per cent of all living plant species. The greatest number of these grow in tropical regions; many of these areas have not yet been fully surveyed by botanists , making tree diversity and ranges poorly known. The majority of tree species are angiosperms or hardwoods. Of
1647-401: A climate very suitable for agriculture and the country has been the world's largest producer of rice, wheat, tomatoes, eggplant, grapes, watermelon, spinach, and many other crops. In 2021, 12 percent of global permanent meadows and pastures belonged to China, as well as 8% of global cropland. China is one of 17 megadiverse countries , lying in two of the world's major biogeographic realms :
1830-532: A cultural identity among its populace still remembered in the ethnonym of the modern Han Chinese . The Han expanded the empire's territory considerably , with military campaigns reaching Central Asia, Mongolia , Korea , and Yunnan , and the recovery of Guangdong and northern Vietnam from Nanyue . Han involvement in Central Asia and Sogdia helped establish the land route of the Silk Road , replacing
2013-634: A disputed land border with India and Bhutan . China is additionally involved in maritime disputes with multiple countries over territory in the East and South China Seas , such as the Senkaku Islands and the entirety of South China Sea Islands . The People's Republic of China is a one-party state governed by the Chinese Communist Party (CCP). The CCP is officially guided by socialism with Chinese characteristics , which
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#17327914568942196-503: A drier savanna climate and insufficient rainfall to support dense forests, the canopy is not closed, and plenty of sunshine reaches the ground which is covered with grass and scrub. Acacia and baobab are well adapted to living in such areas. The roots of a tree serve to anchor it to the ground and gather water and nutrients to transfer to all parts of the tree. They are also used for reproduction, defence, survival, energy storage and many other purposes. The radicle or embryonic root
2379-730: A far-reaching popular uprising (the May Fourth Movement ). In the late 1920s, the Kuomintang under Chiang Kai-shek was able to reunify the country under its own control with a series of deft military and political maneuverings known collectively as the Northern Expedition . The Kuomintang moved the nation's capital to Nanjing and implemented "political tutelage", an intermediate stage of political development outlined in Sun Yat-sen's Three Principles of
2562-475: A high density of plant species including numerous rare endemics. Tropical and seasonal rainforests , though confined to Yunnan and Hainan , contain a quarter of all the animal and plant species found in China. China has over 10,000 recorded species of fungi . In the early 2000s, China has suffered from environmental deterioration and pollution due to its rapid pace of industrialization. Regulations such as
2745-418: A hundred litres are required to make one litre of birch syrup. Various parts of trees are used as spices. These include cinnamon , made from the bark of the cinnamon tree ( Cinnamomum zeylanicum ) and allspice , the dried small fruits of the pimento tree ( Pimenta dioica ). Nutmeg is a seed found in the fleshy fruit of the nutmeg tree ( Myristica fragrans ) and cloves are the unopened flower buds of
2928-497: A major focus, special economic zones (SEZs) were created. Inefficient state-owned enterprises (SOEs) were restructured and some closed. This marked China's transition away from planned economy. China adopted its current constitution on 4 December 1982. In 1989, there were protests such those in Tiananmen Square , and then throughout the entire nation. Zhao Ziyang was put under house arrest for his sympathies to
3111-556: A member of Eastern North American landscapes, however its range has contracted and Carya is no longer extant west of the Rocky Mountains . Fossils of early hickory nuts show simpler, thinner shells than modern species with the exception of pecans , suggesting that the trees gradually developed defenses to rodent seed predation. During this time, the genus had a distribution across the Northern Hemisphere, but
3294-404: A permanent navy which was supported by the developed shipbuilding industry along with the sea trade. Between the 10th and 11th century CE, the population of China doubled to around 100 million people, mostly because of the expansion of rice cultivation in central and southern China, and the production of abundant food surpluses. The Song dynasty also saw a revival of Confucianism , in response to
3477-509: A process closely related to mycorrhizal association. It has been demonstrated that some trees are interconnected through their root system, forming a colony. The interconnections are made by the inosculation process, a kind of natural grafting or welding of vegetal tissues. The tests to demonstrate this networking are performed by injecting chemicals, sometimes radioactive , into a tree, and then checking for its presence in neighbouring trees. The roots are, generally, an underground part of
3660-404: A process known as cladoptosis . The crown is the spreading top of a tree including the branches and leaves, while the uppermost layer in a forest, formed by the crowns of the trees, is known as the canopy . A sapling is a young tree. Many tall palms are herbaceous monocots, which do not undergo secondary growth and never produce wood. In many tall palms, the terminal bud on the main stem
3843-422: A second spurt of growth, a Lammas growth may occur which is believed to be a strategy to compensate for loss of early foliage to insect predators. Primary growth is the elongation of the stems and roots. Secondary growth consists of a progressive thickening and strengthening of the tissues as the outer layer of the epidermis is converted into bark and the cambium layer creates new phloem and xylem cells. The bark
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#17327914568944026-489: A significant role in reducing erosion and moderating the climate . They remove carbon dioxide from the atmosphere and store large quantities of carbon in their tissues. Trees and forests provide a habitat for many species of animals and plants. Tropical rainforests are among the most biodiverse habitats in the world. Trees provide shade and shelter , timber for construction, fuel for cooking and heating, and fruit for food as well as having many other uses. In much of
4209-424: A similar growth form, by usually growing larger and having a single main stem; but there is no consistent distinction between a tree and a shrub, made more confusing by the fact that trees may be reduced in size under harsher environmental conditions such as on mountains and subarctic areas. The tree form has evolved separately in unrelated classes of plants in response to similar environmental challenges, making it
4392-467: A single tree species, which will not flourish in the absence of its mycorrhizal associate. Others are generalists and associate with many species. The tree acquires minerals such as phosphorus from the fungus, while the fungus obtains the carbohydrate products of photosynthesis from the tree. The hyphae of the fungus can link different trees and a network is formed, transferring nutrients and signals from one place to another. The fungus promotes growth of
4575-640: A slightly looser definition; while the Joshua tree , bamboos and palms do not have secondary growth and never produce true wood with growth rings, they may produce "pseudo-wood" by lignifying cells formed by primary growth. Tree species in the genus Dracaena , despite also being monocots, do have secondary growth caused by meristem in their trunk, but it is different from the thickening meristem found in dicotyledonous trees. Aside from structural definitions, trees are commonly defined by use; for instance, as those plants which yield lumber. The tree growth habit
4758-563: A specified height. In wider definitions, the taller palms , tree ferns , bananas , and bamboos are also trees. Trees are not a monophyletic taxonomic group but consist of a wide variety of plant species that have independently evolved a trunk and branches as a way to tower above other plants to compete for sunlight. The majority of tree species are angiosperms or hardwoods; of the rest, many are gymnosperms or softwoods. Trees tend to be long-lived, some reaching several thousand years old. Trees evolved around 370 million years ago, and it
4941-829: A term which developed under the Western Zhou dynasty in reference to its royal demesne . It was used in official documents as an synonym for the state under the Qing . The name Zhongguo is also translated as 'Middle Kingdom' in English. China is sometimes referred to as " mainland China " or "the Mainland" when distinguishing it from the Republic of China or the PRC's Special Administrative Regions . Archaeological evidence suggests that early hominids inhabited China 2.25 million years ago. The hominid fossils of Peking Man ,
5124-484: A tree is any plant with the general form of an elongated stem, or trunk, which supports the photosynthetic leaves or branches at some distance above the ground. Trees are also typically defined by height, with smaller plants from 0.5 to 10 m (1.6 to 32.8 ft) being called shrubs , so the minimum height of a tree is only loosely defined. Large herbaceous plants such as papaya and bananas are trees in this broad sense. A commonly applied narrower definition
5307-436: A wide range of edible fruits are found in the tropics. Other commercially important fruit include dates, figs and olives. Palm oil is obtained from the fruits of the oil palm ( Elaeis guineensis ). The fruits of the cocoa tree ( Theobroma cacao ) are used to make cocoa and chocolate and the berries of coffee trees, Coffea arabica and Coffea canephora , are processed to extract the coffee beans. In many rural areas of
5490-416: A wide range of shapes and sizes, in response to environmental pressures including climate and predation. They can be broad or needle-like, simple or compound, lobed or entire, smooth or hairy, delicate or tough, deciduous or evergreen. The needles of coniferous trees are compact but are structurally similar to those of broad-leaved trees. They are adapted for life in environments where resources are low or water
5673-552: A widespread diverse group of which the only survivor is the maidenhair tree Ginkgo biloba . This is considered to be a living fossil because it is virtually unchanged from the fossilised specimens found in Triassic deposits. During the Mesozoic (245 to 66 million years ago) the conifers flourished and became adapted to live in all the major terrestrial habitats. Subsequently, the tree forms of flowering plants evolved during
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5856-457: Is Marxism adapted to Chinese circumstances . The Chinese constitution states that the PRC "is a socialist state governed by a people's democratic dictatorship that is led by the working class and based on an alliance of workers and peasants," that the state institutions "shall practice the principle of democratic centralism ," and that "the defining feature of socialism with Chinese characteristics
6039-403: Is evergreen . Hickory flowers are small, yellow-green catkins produced in spring. They are wind-pollinated and self-incompatible . The fruit is a globose or oval nut, 2–5 cm (0.8–2.0 in) long and 1.5–3 cm (0.6–1.2 in) diameter, enclosed in a four- valved husk , which splits open at maturity. The nut shell is thick and bony in most species, but thin in a few, notably
6222-557: Is a flavouring obtained from distilling bark from the roots of the sassafras tree ( Sassafras albidum ). The leaves of trees are widely gathered as fodder for livestock and some can be eaten by humans but they tend to be high in tannins which makes them bitter. Leaves of the curry tree ( Murraya koenigii ) are eaten, those of kaffir lime ( Citrus × hystrix ) (in Thai food ) and Ailanthus (in Korean dishes such as bugak ) and those of
6405-473: Is a matter of debate. Alternative suggestions include the names for Yelang and the Jing or Chu state. The official name of the modern state is the "People's Republic of China" ( simplified Chinese : 中华人民共和国 ; traditional Chinese : 中華人民共和國 ; pinyin : Zhōnghuá rénmín gònghéguó ). The shorter form is "China" ( 中国 ; 中國 ; Zhōngguó ), from zhōng ('central') and guó ('state'),
6588-516: Is a rudimentary stalk and neatly folded miniature leaves, ready to expand when the next growing season arrives. Buds also form in the axils of the leaves ready to produce new side shoots. A few trees, such as the eucalyptus , have "naked buds" with no protective scales and some conifers, such as the Lawson's cypress , have no buds but instead have little pockets of meristem concealed among the scale-like leaves. When growing conditions improve, such as
6771-416: Is a sudden movement of sap at the end of the winter as trees prepare to burst into growth. In North America, the sap of the sugar maple ( Acer saccharum ) is used in the production of maple syrup . About 90% of the sap is water, the remaining 10% being a mixture of various sugars and certain minerals. The sap is harvested by drilling holes in the trunks of the trees and collecting the liquid that flows out of
6954-576: Is also a preferred type for smoking cured meats. In the Southern United States , hickory is popular for cooking barbecue , as hickory grows abundantly in the region and adds flavor to the meat. Tree In botany , a tree is a perennial plant with an elongated stem , or trunk , usually supporting branches and leaves. In some usages, the definition of a tree may be narrower, including only woody plants with secondary growth , plants that are usable as lumber or plants above
7137-557: Is also found in the southern hemisphere, as for example in the Eastern Australia temperate forest, characterised by Eucalyptus forest and open acacia woodland. In tropical regions with a monsoon or monsoon-like climate, where a drier part of the year alternates with a wet period as in the Amazon rainforest , different species of broad-leaved trees dominate the forest, some of them being deciduous. In tropical regions with
7320-528: Is an evolutionary adaptation found in different groups of plants: by growing taller, trees are able to compete better for sunlight. Trees tend to be tall and long-lived, some reaching several thousand years old. Several trees are among the oldest organisms now living. Trees have modified structures such as thicker stems composed of specialised cells that add structural strength and durability, allowing them to grow taller than many other plants and to spread out their foliage. They differ from shrubs , which have
7503-856: Is bounded by the Bohai , Yellow , East China and South China seas. China connects through the Kazakh border to the Eurasian Steppe . The territory of China lies between latitudes 18° and 54° N , and longitudes 73° and 135° E . The geographical center of China is marked by the Center of the Country Monument at 35°50′40.9″N 103°27′7.5″E / 35.844694°N 103.452083°E / 35.844694; 103.452083 ( Geographical center of China ) . China's landscapes vary significantly across its vast territory. In
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7686-585: Is commonly agreed that pre-modern China's population experienced two growth spurts, one during the Northern Song period (960–1127), and other during the Qing period (around 1700–1830). By the High Qing era China was possibly the most commercialized country in the world, and imperial China experienced a second commercial revolution by the end of the 18th century. On the other hand, the centralized autocracy
7869-418: Is continually replaced by a living layer of cells called the cork cambium or phellogen. The London plane ( Platanus × hispanica ) periodically sheds its bark in large flakes. Similarly, the bark of the silver birch ( Betula pendula ) peels off in strips. As the tree's girth expands, newer layers of bark are larger in circumference, and the older layers develop fissures in many species. In some trees such as
8052-503: Is developed by the Indian banyan . Many large trees have buttress roots which flare out from the lower part of the trunk. These brace the tree rather like angle brackets and provide stability, reducing sway in high winds. They are particularly prevalent in tropical rainforests where the soil is poor and the roots are close to the surface. Some tree species have developed root extensions that pop out of soil, in order to get oxygen, when it
8235-415: Is divided into 33 province-level divisions : 22 provinces , five autonomous regions , four municipalities , and two semi-autonomous special administrative regions . Beijing is the country's capital, while Shanghai is its most populous city by urban area and largest financial center . China is considered one of the cradles of civilization : the first human inhabitants in the region arrived during
8418-414: Is estimated that there are around three trillion mature trees in the world currently. A tree typically has many secondary branches supported clear of the ground by the trunk, which typically contains woody tissue for strength, and vascular tissue to carry materials from one part of the tree to another. For most trees the trunk is surrounded by a layer of bark which serves as a protective barrier. Below
8601-516: Is hard, stiff, dense and shock resistant. There are woods stronger than hickory and woods that are harder, but the combination of strength, toughness, hardness, and stiffness found in hickory wood is not found in any other commercial wood. Hickory is therefore used in a number of items requiring these properties, such as tool handles, bows , wheel spokes, walking sticks , drumsticks and wood flooring . Baseball bats were formerly made of hickory, but are now more commonly made of ash ; however, it
8784-461: Is home to a variety of forest types. Cold coniferous forests predominate in the north of the country, supporting animal species such as moose and Asian black bear , along with over 120 bird species. The understory of moist conifer forests may contain thickets of bamboo . In higher montane stands of juniper and yew , the bamboo is replaced by rhododendrons . Subtropical forests, which are predominate in central and southern China, support
8967-486: Is inelastic. Eventually the growth of a tree slows down and stops and it gets no taller. If damage occurs the tree may in time become hollow. Leaves are structures specialised for photosynthesis and are arranged on the tree in such a way as to maximise their exposure to light without shading each other. They are an important investment by the tree and may be thorny or contain phytoliths , lignins , tannins or poisons to discourage herbivory. Trees have evolved leaves in
9150-424: Is not available in the soil because of excess water. These root extensions are called pneumatophores , and are present, among others, in black mangrove and pond cypress. The main purpose of the trunk is to raise the leaves above the ground, enabling the tree to overtop other plants and outcompete them for light. It also transports water and nutrients from the roots to the aerial parts of the tree, and distributes
9333-451: Is protected by law, and as of 2005 , the country has over 2,349 nature reserves , covering a total area of 149.95 million hectares, 15 percent of China's total land area. Most wild animals have been eliminated from the core agricultural regions of east and central China, but they have fared better in the mountainous south and west. The Baiji was confirmed extinct on 12 December 2006. China has over 32,000 species of vascular plants, and
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#17327914568949516-458: Is ready to eat when the process is complete, having been tenderised and flavoured by the smoke it has absorbed. In the cold process, the temperature is not allowed to rise above 100 °F (38 °C). The flavour of the food is enhanced but raw food requires further cooking. If it is to be preserved, meat should be cured before cold smoking. Wood has traditionally been used for fuel, especially in rural areas. In less developed nations it may be
9699-428: Is related to climatic conditions; growth normally ceases when conditions are either too cold or too dry. In readiness for the inactive period, trees form buds to protect the meristem , the zone of active growth. Before the period of dormancy, the last few leaves produced at the tip of a twig form scales. These are thick, small and closely wrapped and enclose the growing point in a waterproof sheath. Inside this bud there
9882-493: Is replacing ash as the wood of choice for Scottish shinty sticks. Hickory was also extensively used for the construction of early aircraft. Due to its grain structure, hickory is more susceptible to moisture absorption than other species of wood, and is therefore more prone to shrinkage, warping or swelling with changes in humidity. Hickory is also highly prized for wood-burning stoves and chimineas , as its density and high energy content make it an efficient fuel. Hickory wood
10065-407: Is scarce. Frozen ground may limit water availability and conifers are often found in colder places at higher altitudes and higher latitudes than broad leaved trees. In conifers such as fir trees, the branches hang down at an angle to the trunk, enabling them to shed snow. In contrast, broad leaved trees in temperate regions deal with winter weather by shedding their leaves. When the days get shorter and
10248-402: Is that a tree has a woody trunk formed by secondary growth , meaning that the trunk thickens each year by growing outwards, in addition to the primary upwards growth from the growing tip . Under such a definition, herbaceous plants such as palms , bananas and papayas are not considered trees regardless of their height, growth form or stem girth. Certain monocots may be considered trees under
10431-451: Is the direct ancestor of modern Chinese characters . The Shang were overthrown by the Zhou , who ruled between the 11th and 5th centuries BCE, though the centralized authority of Son of Heaven was slowly eroded by fengjian lords. Some principalities eventually emerged from the weakened Zhou and continually waged war with each other during the 300-year Spring and Autumn period . By
10614-471: Is the first part of a seedling to emerge from the seed during the process of germination . This develops into a taproot which goes straight downwards. Within a few weeks lateral roots branch out of the side of this and grow horizontally through the upper layers of the soil. In most trees, the taproot eventually withers away and the wide-spreading laterals remain. Near the tip of the finer roots are single cell root hairs . These are in immediate contact with
10797-401: Is the leadership of the Chinese Communist Party." The PRC officially terms itself as a democracy , using terms such as "socialist consultative democracy", and " whole-process people's democracy ". However, the country is commonly described as an authoritarian one-party state and a dictatorship , with among the heaviest restrictions worldwide in many areas, most notably against freedom of
10980-452: Is the only one to develop, so they have unbranched trunks with large spirally arranged leaves. Some of the tree ferns, order Cyatheales , have tall straight trunks, growing up to 20 metres (66 ft), but these are composed not of wood but of rhizomes which grow vertically and are covered by numerous adventitious roots . The number of trees in the world, according to a 2015 estimate, is 3.04 trillion, of which 1.39 trillion (46%) are in
11163-559: Is the world's leading investor in renewable energy and its commercialization , with $ 546 billion invested in 2022; it is a major manufacturer of renewable energy technologies and invests heavily in local-scale renewable energy projects. Long heavily relying on non-renewable energy sources such as coal, China's adaptation of renewable energy has increased significantly in recent years, with their share increasing from 26.3 percent in 2016 to 31.9 percent in 2022. In 2023, 60.5% of China's electricity came from coal (largest producer in
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#173279145689411346-501: Is used as a food plant by the larvae of some Lepidoptera species. These include: The hickory leaf stem gall phylloxera ( Phylloxera caryaecaulis ) also uses the hickory tree as a food source. Phylloxeridae are related to aphids and have a similarly complex life cycle. Eggs hatch in early spring and the galls quickly form around the developing insects. Phylloxera galls may damage weakened or stressed hickories, but are generally harmless. Deformed leaves and twigs can rain down from
11529-702: The Encyclopædia Britannica , to 9,596,961 km (3,705,407 sq mi) according to the UN Demographic Yearbook , and The World Factbook . China has the longest combined land border in the world , measuring 22,117 km (13,743 mi) and its coastline covers approximately 14,500 km (9,000 mi) from the mouth of the Yalu River (Amnok River) to the Gulf of Tonkin . China borders 14 nations and covers
11712-456: The 18th CCP National Congress in 2012. Shortly after his ascension to power, Xi launched a vast anti-corruption crackdown , that prosecuted more than 2 million officials by 2022. During his tenure , Xi has consolidated power unseen since the initiation of economic and political reforms. China's landscape is vast and diverse, ranging from the Gobi and Taklamakan Deserts in the arid north to
11895-515: The Cretaceous period. These began to displace the conifers during the Tertiary era (66 to 2 million years ago) when forests covered the globe. When the climate cooled 1.5 million years ago and the first of four glacial periods occurred, the forests retreated as the ice advanced. In the interglacials , trees recolonised the land that had been covered by ice, only to be driven back again in
12078-778: The Cultural Revolution , sparking a decade of political recrimination and social upheaval that lasted until Mao's death in 1976. In October 1971, the PRC replaced the ROC in the United Nations, and took its seat as a permanent member of the Security Council. After Mao's death, the Gang of Four was arrested by Hua Guofeng and held responsible for the Cultural Revolution. The Cultural Revolution
12261-776: The Great Leap Forward was largely responsible for the Great Chinese Famine that ended with millions of Chinese people having died, and the subsequent Cultural Revolution was a period of social turmoil and persecution characterized by Maoist populism. Following the Sino-Soviet split , the Shanghai Communiqué in 1972 would precipitate the normalization of relations with the United States . Economic reforms that began in 1978 moved
12444-513: The Jiahu symbols (7th millennium BCE) constituted the earliest Chinese writing system. According to traditional Chinese historiography , the Xia dynasty was established during the late 3rd millennium BCE, marking the beginning of the dynastic cycle that was understood to underpin China's entire political history. In the modern era, the Xia's historicity came under increasing scrutiny, in part due to
12627-636: The Kuomintang and the Communists led to the resumption of civil war. Constitutional rule was established in 1947, but because of the ongoing unrest, many provisions of the ROC constitution were never implemented in mainland China. Afterwards, the CCP took control of most of mainland China, and the ROC government retreated offshore to Taiwan . On 1 October 1949, CCP Chairman Mao Zedong formally proclaimed
12810-568: The Northern Chinese Famine of 1876–1879 , in which between 9 and 13 million people died. The Guangxu Emperor drafted a reform plan in 1898 to establish a modern constitutional monarchy , but these plans were thwarted by the Empress Dowager Cixi . The ill-fated anti-foreign Boxer Rebellion of 1899–1901 further weakened the dynasty. Although Cixi sponsored a program of reforms known as the late Qing reforms ,
12993-620: The Palearctic and the Indomalayan . By one measure, China has over 34,687 species of animals and vascular plants, making it the third-most biodiverse country in the world, after Brazil and Colombia . The country is a party to the Convention on Biological Diversity ; its National Biodiversity Strategy and Action Plan was received by the convention in 2010. China is home to at least 551 species of mammals (the third-highest in
13176-578: The Paleolithic . By the late 2nd millennium BCE, the earliest dynastic states had emerged in the Yellow River basin. The 8th–3rd centuries BCE saw a breakdown in the authority of the Zhou dynasty , accompanied by the emergence of administrative and military techniques, literature , philosophy , and historiography . In 221 BCE, China was unified under an emperor , ushering in more than two millennia of imperial dynasties including
13359-565: The People's Republic of China ( PRC ), is a country in East Asia . With a population exceeding 1.4 billion, it is the second-most populous country after India , representing 17.4% of the world population. China spans the equivalent of five time zones and borders fourteen countries by land . With an area of nearly 9.6 million square kilometers (3,700,000 sq mi), it is the third-largest country by total land area. The country
13542-630: The Pleistocene Ice Age beginning 2 million years ago obliterated it from Europe. In Anatolia, the genus appears to have disappeared only in the early Holocene , probably related to human disturbance. The distribution of Carya in North America also contracted and it completely disappeared from the continent west of the Rocky Mountains . It is likely that the genus originated in North America, and later spread to Europe and Asia. The genus Carya (not to be confused with Careya in
13725-557: The Qin , Han , Tang , Yuan , Ming , and Qing . With the invention of gunpowder and paper , the establishment of the Silk Road , and the building of the Great Wall , Chinese culture flourished and has heavily influenced both its neighbors and lands further afield. However, China began to cede parts of the country in the late 19th century to various European powers by a series of unequal treaties . After decades of Qing China on
13908-476: The State Council , China's cabinet, composed of four vice premiers, state councilors , and the heads of ministries and commissions. The Chinese People's Political Consultative Conference (CPPCC) is a political advisory body that is critical in China's " united front " system, which aims to gather non-CCP voices to support the CCP. Similar to the people's congresses, CPPCC's exist at various division, with
14091-505: The Turpan Depression . China's climate is mainly dominated by dry seasons and wet monsoons , which lead to pronounced temperature differences between winter and summer. In the winter, northern winds coming from high-latitude areas are cold and dry; in summer, southern winds from coastal areas at lower latitudes are warm and moist. A major environmental issue in China is the continued expansion of its deserts , particularly
14274-621: The World Trade Organization in 2001. At the 16th CCP National Congress in 2002, Hu Jintao succeeded Jiang as the general secretary. Under Hu, China maintained its high rate of economic growth, overtaking the United Kingdom, France, Germany and Japan to become the world's second-largest economy. However, the growth also severely impacted the country's resources and environment, and caused major social displacement. Xi Jinping succeeded Hu as paramount leader at
14457-719: The Xi , Mekong , Brahmaputra and Amur . To the west sit major mountain ranges, most notably the Himalayas. High plateaus feature among the more arid landscapes of the north, such as the Taklamakan and the Gobi Desert. The world's highest point, Mount Everest (8,848 m), lies on the Sino-Nepalese border. The country's lowest point, and the world's third-lowest, is the dried lake bed of Ayding Lake (−154 m) in
14640-549: The Xinhai Revolution of 1911–1912 ended the Qing dynasty and established the Republic of China . Puyi , the last Emperor, abdicated in 1912 . On 1 January 1912, the Republic of China was established, and Sun Yat-sen of the Kuomintang (KMT) was proclaimed provisional president. In March 1912, the presidency was given to Yuan Shikai , a former Qing general who in 1915 proclaimed himself Emperor of China . In
14823-414: The annual growth rings There may also be rays running at right angles to growth rings. These are vascular rays which are thin sheets of living tissue permeating the wood. Many older trees may become hollow but may still stand upright for many years. Trees do not usually grow continuously throughout the year but mostly have spurts of active expansion followed by periods of rest. This pattern of growth
15006-576: The campaigns against Western Xia by Genghis Khan , who also invaded Jin territories . In 1271, the Mongol leader Kublai Khan established the Yuan dynasty , which conquered the last remnant of the Song dynasty in 1279. Before the Mongol invasion, the population of Song China was 120 million citizens; this was reduced to 60 million by the time of the census in 1300. A peasant named Zhu Yuanzhang overthrew
15189-552: The pine ( Pinus species) the bark exudes sticky resin which deters attackers whereas in rubber trees ( Hevea brasiliensis ) it is a milky latex that oozes out. The quinine bark tree ( Cinchona officinalis ) contains bitter substances to make the bark unpalatable. Large tree-like plants with lignified trunks in the Pteridophyta , Arecales , Cycadophyta and Poales such as the tree ferns, palms, cycads and bamboos have different structures and outer coverings. Although
15372-548: The subtropical forests in the wetter south. The Himalaya , Karakoram , Pamir and Tian Shan mountain ranges separate China from much of South and Central Asia . The Yangtze and Yellow Rivers, the third- and sixth-longest in the world, respectively, run from the Tibetan Plateau to the densely populated eastern seaboard. China's coastline along the Pacific Ocean is 14,500 km (9,000 mi) long and
15555-540: The 12,000 years since the start of human agriculture, the number of trees worldwide has decreased by 46%. There are approximately 64,100 known tree species in the world. With 43% of all tree species, South America has the highest biodiversity, followed by Eurasia (22%), Africa (16%), North America (15%), and Oceania (11%). In suitable environments, such as the Daintree Rainforest in Queensland , or
15738-440: The 1979 Environmental Protection Law are fairly stringent, though they are poorly enforced, frequently disregarded in favor of rapid economic development. China has the second-highest death toll because of air pollution, after India , with approximately 1 million deaths. Although China ranks as the highest CO 2 emitting country, it only emits 8 tons of CO 2 per capita , significantly lower than developed countries such as
15921-600: The 2010s. In 2020, the Chinese government announced its aims for the country to reach its peak emissions levels before 2030, and achieve carbon neutrality by 2060 in line with the Paris Agreement , which, according to Climate Action Tracker , would lower the expected rise in global temperature by 0.2–0.3 degrees – "the biggest single reduction ever estimated by the Climate Action Tracker". China
16104-668: The British under the 1842 Treaty of Nanking , the first of what have been termed as the " unequal treaties ". The First Sino-Japanese War (1894–1895) resulted in Qing China's loss of influence in the Korean Peninsula , as well as the cession of Taiwan to Japan . The Qing dynasty also began experiencing internal unrest in which tens of millions of people died, especially in the White Lotus Rebellion ,
16287-449: The CCP. The NPC is dominated by the CCP, with another eight minor parties having nominal representation under the condition of upholding CCP leadership. The president is elected by the NPC. The presidency is the ceremonial state representative, but not the constitutional head of state. The incumbent president is Xi Jinping, who is also the general secretary of the CCP and the chairman of
16470-638: The Central Military Commission , making him China's paramount leader and supreme commander of the Armed Forces. The premier is the head of government , with Li Qiang being the incumbent. The premier is officially nominated by the president and then elected by the NPC, and has generally been either the second- or third-ranking member of the Politburo Standing Committee (PSC). The premier presides over
16653-752: The Cherokee in Kanuchi soup, but more often edible oil would be extracted through crushing the nuts and then either straining or boiling the remains. Shagbark and shellbark hickory, along with pecan , are regarded by some as the finest nut trees. Pecans are the most important nut tree native to North America. When cultivated for their nuts , clonal ( grafted ) trees of the same cultivar cannot pollinate each other because of their self-incompatibility. Two or more cultivars must be planted together for successful pollination . Seedlings (grown from hickory nuts) will usually have sufficient genetic variation. Hickory wood
16836-501: The English oak ( Quercus robur ) and 306 species of invertebrate on the Tasmanian oak ( Eucalyptus obliqua ). Non-native tree species provide a less biodiverse community, for example in the United Kingdom the sycamore ( Acer pseudoplatanus ), which originates from southern Europe, has few associated invertebrate species, though its bark supports a wide range of lichens, bryophytes and other epiphytes. Trees differ ecologically in
17019-546: The European bay tree ( Laurus nobilis ) and the California bay tree ( Umbellularia californica ) are used for flavouring food. Camellia sinensis , the source of tea, is a small tree but seldom reaches its full height, being heavily pruned to make picking the leaves easier. Wood smoke can be used to preserve food. In the hot smoking process the food is exposed to smoke and heat in a controlled environment. The food
17202-450: The Gobi Desert. Although barrier tree lines planted since the 1970s have reduced the frequency of sandstorms , prolonged drought and poor agricultural practices have resulted in dust storms plaguing northern China each spring, which then spread to other parts of East Asia, including Japan and Korea. Water quality, erosion , and pollution control have become important issues in China's relations with other countries. Melting glaciers in
17385-717: The Himalayas could potentially lead to water shortages for hundreds of millions of people. According to academics, in order to limit climate change in China to 1.5 °C (2.7 °F) electricity generation from coal in China without carbon capture must be phased out by 2045. With current policies, the GHG emissions of China will probably peak in 2025, and by 2030 they will return to 2022 levels. However, such pathway still leads to three-degree temperature rise. Official government statistics about Chinese agricultural productivity are considered unreliable, due to exaggeration of production at subsidiary government levels. Much of China has
17568-761: The Kuomintang and the CCP. Japanese forces committed numerous war atrocities against the civilian population; as many as 20 million Chinese civilians died. An estimated 40,000 to 300,000 Chinese were massacred in Nanjing alone during the Japanese occupation. China, along with the UK, the United States, and the Soviet Union , were recognized as the Allied " Big Four " in the Declaration by United Nations . Along with
17751-533: The Lecythidaceae) is in the walnut family, Juglandaceae . In the APG system , this family is included in the order Fagales . Several species are known to hybridize, with around nine accepted, named hybrids. Carya sect. Sinocarya C. sinensis has sometimes been split out in a separate genus as Annamocarya sinensis , but not by Plants of the World Online , as genetic data support it being embedded within
17934-580: The PRC initially allied closely with the Soviet Union , the relations between the two communist nations gradually deteriorated , leading China to develop an independent industrial system and its own nuclear weapons . The Chinese population increased from 550 million in 1950 to 900 million in 1974. However, the Great Leap Forward , an idealistic massive industrialization project, resulted in an estimated 15 to 55 million deaths between 1959 and 1961, mostly from starvation. In 1964, China detonated its first atomic bomb. In 1966, Mao and his allies launched
18117-1002: The People program for transforming China into a modern democratic state. The Kuomintang briefly allied with the Chinese Communist Party (CCP) during the Northern Expedition, though the alliance broke down in 1927 after Chiang violently suppressed the CCP and other leftists in Shanghai, marking the beginning of the Chinese Civil War . The CCP declared areas of the country as the Chinese Soviet Republic (Jiangxi Soviet) in November 1931 in Ruijin , Jiangxi . The Jiangxi Soviet
18300-535: The People's Republic of China in Tiananmen Square , Beijing . In 1950, the PRC captured Hainan from the ROC and annexed Tibet . However, remaining Kuomintang forces continued to wage an insurgency in western China throughout the 1950s. The CCP consolidated its popularity among the peasants through the Land Reform Movement , which included the state-tolerated executions of between 1 and 2 million landlords by peasants and former tenants. Though
18483-949: The UN representative for China was changed from the ROC to the PRC in 1971. It is a founding member of several multilateral and regional organizations such as the AIIB , the Silk Road Fund , the New Development Bank , and the RCEP . It is a member of the BRICS , the G20 , APEC , the SCO , and the East Asia Summit . Making up around one-fifth of the world economy, the Chinese economy is
18666-488: The United States (16.1), Australia (16.8) and South Korea (13.6). Greenhouse gas emissions by China are the world's largest . The country has significant water pollution problems; only 89.4% of China's national surface water was graded suitable for human consumption by the Ministry of Ecology and Environment in 2023. China has prioritized clamping down on pollution, bringing a significant decrease in air pollution in
18849-681: The Yuan in 1368 and founded the Ming dynasty as the Hongwu Emperor . Under the Ming dynasty, China enjoyed another golden age, developing one of the strongest navies in the world and a rich and prosperous economy amid a flourishing of art and culture. It was during this period that admiral Zheng He led the Ming treasure voyages throughout the Indian Ocean, reaching as far as East Africa. In
19032-496: The arrival of warmer weather and the longer days associated with spring in temperate regions, growth starts again. The expanding shoot pushes its way out, shedding the scales in the process. These leave behind scars on the surface of the twig. The whole year's growth may take place in just a few weeks. The new stem is unlignified at first and may be green and downy. The Arecaceae (palms) have their leaves spirally arranged on an unbranched trunk. In some tree species in temperate climates,
19215-437: The bark functions as a protective barrier, it is itself attacked by boring insects such as beetles. These lay their eggs in crevices and the larvae chew their way through the cellulose tissues leaving a gallery of tunnels. This may allow fungal spores to gain admittance and attack the tree. Dutch elm disease is caused by a fungus ( Ophiostoma species) carried from one elm tree to another by various beetles. The tree reacts to
19398-820: The bulk of East Asia, bordering Vietnam , Laos , and Myanmar in Southeast Asia; India , Bhutan , Nepal , Pakistan and Afghanistan in South Asia; Tajikistan , Kyrgyzstan and Kazakhstan in Central Asia; and Russia, Mongolia , and North Korea in Inner Asia and Northeast Asia . It is narrowly separated from Bangladesh and Thailand to the southwest and south, and has several maritime neighbors such as Japan , Philippines , Malaysia , and Indonesia . China has resolved its land borders with 12 out of 14 neighboring countries, having pursued substantial compromises in most of them. China currently has
19581-440: The clove tree ( Syzygium aromaticum ). Many trees have flowers rich in nectar which are attractive to bees. The production of forest honey is an important industry in rural areas of the developing world where it is undertaken by small-scale beekeepers using traditional methods. The flowers of the elder ( Sambucus ) are used to make elderflower cordial and petals of the plum ( Prunus spp. ) can be candied. Sassafras oil
19764-465: The cone for years waiting for a trigger event to liberate it. Fire stimulates release and germination of seeds of the jack pine , and also enriches the forest floor with wood ash and removes competing vegetation. Similarly, a number of angiosperms including Acacia cyclops and Acacia mangium have seeds that germinate better after exposure to high temperatures. The single extant species of Ginkgophyta ( Ginkgo biloba ) has fleshy seeds produced at
19947-492: The country away from a socialist planned economy towards an increasingly capitalist market economy , spurring significant economic growth. The corresponding movement for increased democracy and liberalization stalled after the Tiananmen Square protests and massacre in 1989. China is a unitary one-party socialist republic led by the CCP. It is one of the five permanent members of the UN Security Council ;
20130-505: The decline, the 1911 Revolution overthrew the Qing dynasty and the monarchy and the Republic of China (ROC) was established the following year. The country under the nascent Beiyang government was unstable and ultimately fragmented during the Warlord Era , which was ended upon the Northern Expedition conducted by the Kuomintang (KMT) to reunify the country. The Chinese Civil War began in 1927, when KMT forces purged members of
20313-610: The earlier path over the Himalayas to India. Han China gradually became the largest economy of the ancient world. Despite the Han's initial decentralization and the official abandonment of the Qin philosophy of Legalism in favor of Confucianism , Qin's legalist institutions and policies continued to be employed by the Han government and its successors. After the end of the Han dynasty , a period of strife known as Three Kingdoms followed, at
20496-436: The earliest for which there are both contemporary written records and undisputed archaeological evidence. The Shang ruled much of the Yellow River valley until the 11th century BCE, with the earliest hard evidence dated c. 1300 BCE . The oracle bone script , attested from c. 1250 BCE but generally assumed to be considerably older, represents the oldest known form of written Chinese , and
20679-455: The earliest known attestation of the Xia being written millennia after the date given for their collapse. In 1958, archaeologists discovered sites belonging to the Erlitou culture that existed during the early Bronze Age ; they have since been characterized as the remains of the historical Xia, but this conception is often rejected. The Shang dynasty that traditionally succeeded the Xia is
20862-537: The early Ming dynasty, China's capital was moved from Nanjing to Beijing. With the budding of capitalism, philosophers such as Wang Yangming critiqued and expanded Neo-Confucianism with concepts of individualism and equality of four occupations . The scholar-official stratum became a supporting force of industry and commerce in the tax boycott movements, which, together with the famines and defense against Japanese invasions of Korea (1592–1598) and Later Jin incursions led to an exhausted treasury. In 1644, Beijing
21045-424: The ease with which they can be found by herbivores. Tree apparency varies with a tree's size and semiochemical content, and with the extent to which it is concealed by nonhost neighbours from its insect pests . In ecosystems such as mangrove swamps, trees play a role in developing the habitat, since the roots of the mangrove trees reduce the speed of flow of tidal currents and trap water-borne sediment, reducing
21228-737: The east, along the shores of the Yellow Sea and the East China Sea, there are extensive and densely populated alluvial plains , while on the edges of the Inner Mongolian plateau in the north, broad grasslands predominate. Southern China is dominated by hills and low mountain ranges, while the central-east hosts the deltas of China's two major rivers, the Yellow River and the Yangtze River. Other major rivers include
21411-656: The end of which Wei was swiftly overthrown by the Jin dynasty . The Jin fell to civil war upon the ascension of a developmentally disabled emperor ; the Five Barbarians then rebelled and ruled northern China as the Sixteen States . The Xianbei unified them as the Northern Wei , whose Emperor Xiaowen reversed his predecessors' apartheid policies and enforced a drastic sinification on his subjects . In
21594-664: The ends of short branches on female trees, and Gnetum , a tropical and subtropical group of gymnosperms produce seeds at the tip of a shoot axis. The earliest trees were tree ferns , horsetails and lycophytes , which grew in forests in the Carboniferous period. The first tree may have been Wattieza , fossils of which were found in New York state in 2007 dating back to the Middle Devonian (about 385 million years ago). Prior to this discovery, Archaeopteris
21777-473: The face of popular condemnation and opposition from his own Beiyang Army , he was forced to abdicate and re-establish the republic in 1916. After Yuan Shikai's death in 1916, China was politically fragmented. Its Beijing-based government was internationally recognized but virtually powerless; regional warlords controlled most of its territory. During this period , China participated in World War I and saw
21960-555: The failed Taiping Rebellion that ravaged southern China in the 1850s and 1860s and the Dungan Revolt (1862–1877) in the northwest. The initial success of the Self-Strengthening Movement of the 1860s was frustrated by a series of military defeats in the 1880s and 1890s. In the 19th century, the great Chinese diaspora began. Losses due to emigration were added to by conflicts and catastrophes such as
22143-461: The far north of the northern hemisphere is moist taiga or northern coniferous forest (also called boreal forest). Taiga is the world's largest land biome , forming 29% of the world's forest cover. The long cold winter of the far north is unsuitable for plant growth and trees must grow rapidly in the short summer season when the temperature rises and the days are long. Light is very limited under their dense cover and there may be little plant life on
22326-480: The food produced by the leaves to all other parts, including the roots. In the case of angiosperms and gymnosperms, the outermost layer of the trunk is the bark , mostly composed of dead cells of phellem (cork). It provides a thick, waterproof covering to the living inner tissue. It protects the trunk against the elements, disease, animal attack and fire. It is perforated by a large number of fine breathing pores called lenticels , through which oxygen diffuses. Bark
22509-401: The forest floor, although fungi may abound. Similar woodland is found on mountains where the altitude causes the average temperature to be lower thus reducing the length of the growing season. Where rainfall is relatively evenly spread across the seasons in temperate regions, temperate broadleaf and mixed forest typified by species like oak, beech, birch and maple is found. Temperate forest
22692-399: The fruit to be a nut. The oldest fossils attributed to Carya are Cretaceous pollen grains from Mexico and New Mexico . Fossil and molecular data suggest the genus Carya may have diversified during the Miocene . Modern Carya first appear in Oligocene strata 34 million years ago. Recent discoveries of Carya fruit fossils further support the hypothesis that the genus has long been
22875-425: The fruits and either discard the seeds, or swallow them so they pass through the gut to be deposited in the animal's droppings well away from the parent tree. The germination of some seeds is improved when they are processed in this way. Nuts may be gathered by animals such as squirrels that cache any not immediately consumed. Many of these caches are never revisited; the nut-casing softens with rain and frost, and
23058-480: The ground underneath trees there is shade, and often there is undergrowth, leaf litter , and decaying wood that provide other habitat. Trees stabilise the soil, prevent rapid run-off of rain water, help prevent desertification, have a role in climate control and help in the maintenance of biodiversity and ecosystem balance. Many species of tree support their own specialised invertebrates . In their natural habitats, 284 different species of insect have been found on
23241-557: The ground, the roots branch and spread out widely; they serve to anchor the tree and extract moisture and nutrients from the soil . Above ground, the branches divide into smaller branches and shoots. The shoots typically bear leaves, which capture light energy and convert it into sugars by photosynthesis , providing the food for the tree's growth and development. Trees usually reproduce using seeds . Flowering plants have their seeds inside fruits, while conifers carry their seeds in cones, and tree ferns produce spores instead. Trees play
23424-421: The ground. Trees use a variety of methods of seed dispersal . Some rely on wind, with winged or plumed seeds. Others rely on animals, for example with edible fruits. Others again eject their seeds (ballistic dispersal), or use gravity so that seeds fall and sometimes roll. Seeds are the primary way that trees reproduce and their seeds vary greatly in size and shape. Some of the largest seeds come from trees, but
23607-460: The growth of Buddhism during the Tang, and a flourishing of philosophy and the arts, as landscape art and porcelain were brought to new levels of complexity. However, the military weakness of the Song army was observed by the Jin dynasty . In 1127, Emperor Huizong of Song and the capital Bianjing were captured during the Jin–Song wars . The remnants of the Song retreated to southern China . The Mongol conquest of China began in 1205 with
23790-413: The growth of the fungus by blocking off the xylem tissue carrying sap upwards and the branch above, and eventually the whole tree, is deprived of nourishment and dies. In Britain in the 1990s, 25 million elm trees were killed by this disease. The innermost layer of bark is known as the phloem and this is involved in the transport of the sap containing the sugars made by photosynthesis to other parts of
23973-447: The heartwood are blocked in some species. Heartwood is usually darker in colour than the sapwood. It is the dense central core of the trunk giving it rigidity. Three quarters of the dry mass of the xylem is cellulose , a polysaccharide , and most of the remainder is lignin, a complex polymer . A transverse section through a tree trunk or a horizontal core will show concentric circles of lighter or darker wood – tree rings. These rings are
24156-400: The informal paramount leader . The current general secretary is Xi Jinping , who took office on 15 November 2012. At the local level, the secretary of the CCP committee of a subdivision outranks the local government level; CCP committee secretary of a provincial division outranks the governor while the CCP committee secretary of a city outranks the mayor. The government in China is under
24339-411: The inserted spigots; the sap is then heated to concentrate the flavour. Similarly in northern Europe the spring rise in the sap of the silver birch ( Betula pendula ) is tapped and collected, either to be drunk fresh or fermented into an alcoholic drink. In Alaska, the sap of the sweet birch ( Betula lenta ) is made into a syrup with a sugar content of 67%. Sweet birch sap is more dilute than maple sap;
24522-400: The inside. The newly created xylem is the sapwood . It is composed of water-conducting cells and associated cells which are often living, and is usually pale in colour. It transports water and minerals from the roots to the upper parts of the tree. The oldest, inner part of the sapwood is progressively converted into heartwood as new sapwood is formed at the cambium. The conductive cells of
24705-409: The largest importer of Russian crude oil in 2022. China is the third-largest country in the world by land area after Russia , and the third- or fourth-largest country in the world by total area. China's total area is generally stated as being approximately 9,600,000 km (3,700,000 sq mi). Specific area figures range from 9,572,900 km (3,696,100 sq mi) according to
24888-528: The largest tree, Sequoiadendron giganteum , produces one of the smallest tree seeds. The great diversity in tree fruits and seeds reflects the many different ways that tree species have evolved to disperse their offspring. For a tree seedling to grow into an adult tree it needs light. If seeds only fell straight to the ground, competition among the concentrated saplings and the shade of the parent would likely prevent it from flourishing. Many seeds such as birch are small and have papery wings to aid dispersal by
25071-409: The mixed podocarp and broadleaf forest of Ulva Island, New Zealand , forest is the more-or-less stable climatic climax community at the end of a plant succession, where open areas such as grassland are colonised by taller plants, which in turn give way to trees that eventually form a forest canopy. In cool temperate regions, conifers often predominate; a widely distributed climax community in
25254-478: The multiple consultation mechanisms that exist in Chinese government. According to the CCP constitution , its highest body is the National Congress held every five years. The National Congress elects the Central Committee , who then elects the party's Politburo , Politburo Standing Committee and the general secretary ( party leader ), the top leadership of the country. The general secretary holds ultimate power and authority over party and state and serves as
25437-519: The next glacial period. Trees are an important part of the terrestrial ecosystem , providing essential habitats including many kinds of forest for communities of organisms. Epiphytic plants such as ferns , some mosses, liverworts, orchids and some species of parasitic plants (e.g., mistletoe ) hang from branches; these along with arboreal lichens, algae, and fungi provide micro-habitats for themselves and for other organisms, including animals. Leaves, flowers and fruits are seasonally available. On
25620-420: The old lineages of flowering plants called basal angiosperms or paleodicots ; these include Amborella , Magnolia , nutmeg and avocado , while trees such as bamboo, palms and bananas are monocots . Wood gives structural strength to the trunk of most types of tree; this supports the plant as it grows larger. The vascular system of trees allows water, nutrients and other chemicals to be distributed around
25803-477: The only fuel available and collecting firewood is often a time-consuming task as it becomes necessary to travel further and further afield in the search for fuel. It is often burned inefficiently on an open fire. In more developed countries other fuels are available and burning wood is a choice rather than a necessity. Modern wood-burning stoves are very fuel efficient and new products such as wood pellets are available to burn. China China , officially
25986-416: The other Asian Carya . Carya sect. Carya – typical hickories Carya sect. Apocarya – pecans Seven species are native to southeast Asia in China , Indochina , and northeastern India ( Assam ), and twelve are native to North America, of which eleven occur in the United States, four in Mexico (of which one, C. palmeri , endemic there), and five extending into southern Canada . Hickory
26169-420: The other three great powers, China was one of the four major Allies of World War II , and was later considered one of the primary victors in the war. After the surrender of Japan in 1945, Taiwan, including the Penghu , was handed over to Chinese control ; however, the validity of this handover is controversial. China emerged victorious but war-ravaged and financially drained. The continued distrust between
26352-492: The pecan ( C. illinoinensis ); it is divided into two halves, which split apart when the seed germinates . Some fruit are borderline and difficult to categorize. Hickory ( Carya ) nuts and walnut ( Juglans ) nuts, both in the family Juglandaceae , grow within an outer husk; these fruit are sometimes considered to be drupes or drupaceous nuts, rather than true botanical nuts. "Tryma" is a specialized term for such nut-like drupes. The Angiosperm Phylogeny Group however consider
26535-585: The plant and reduce water loss. Both the production of wood and the production of cork are forms of secondary growth. Trees are either evergreen , having foliage that persists and remains green throughout the year, or deciduous , shedding their leaves at the end of the growing season and then having a dormant period without foliage. Most conifers are evergreens, but larches ( Larix and Pseudolarix ) are deciduous, dropping their needles each autumn, and some species of cypress ( Glyptostrobus , Metasequoia and Taxodium ) shed small leafy shoots annually in
26718-409: The plant, and without it trees would not be able to grow as large as they do. Trees need to draw water high up the stem through the xylem from the roots by capillary action , as water continually evaporates from the leaves in the process of transpiration . If insufficient water is available the leaves will die. The three main parts of trees include the root, stem, and leaves; they are integral parts of
26901-417: The press , freedom of assembly , free formation of social organizations , freedom of religion and free access to the Internet . China has consistently been ranked amongst the lowest as an "authoritarian regime" by the Economist Intelligence Unit 's Democracy Index , ranking at 148th out of 167 countries in 2023. Other sources suggest that terming China as "authoritarian" does not sufficiently account for
27084-417: The protests and was replaced by Jiang Zemin . Jiang continued economic reforms, closing many SOEs and trimming down " iron rice bowl " (life-tenure positions). China's economy grew sevenfold during this time. British Hong Kong and Portuguese Macau returned to China in 1997 and 1999 , respectively, as special administrative regions under the principle of one country, two systems . The country joined
27267-437: The rest, many are gymnosperms or softwood trees; these include conifers , cycads , ginkgophytes and gnetales , which produce seeds which are not enclosed in fruits, but in open structures such as pine cones , and many have tough waxy leaves, such as pine needles. Most angiosperm trees are eudicots , the "true dicotyledons", so named because the seeds contain two cotyledons or seed leaves. There are also some trees among
27450-406: The rival Chinese Communist Party (CCP), who proceeded to engage in sporadic fighting against the KMT-led Nationalist government . Following the country's invasion by the Empire of Japan in 1937, the CCP and KMT formed the Second United Front to fight the Japanese. The Second Sino-Japanese War eventually ended in a Chinese victory; however, the CCP and the KMT resumed their civil war as soon as
27633-428: The roots and helps protect the trees against predators and pathogens. It can also limit damage done to a tree by pollution as the fungus accumulate heavy metals within its tissues. Fossil evidence shows that roots have been associated with mycorrhizal fungi since the early Paleozoic , four hundred million years ago, when the first vascular plants colonised dry land. Some trees such as Alder ( Alnus species) have
27816-464: The seeds on the surface of water. Mangroves often grow in water and some species have buoyant fruits with seeds that start germinating before they detach from the parent tree. These float on the water and may become lodged on emerging mudbanks and successfully take root. Other seeds, such as apple pips and plum stones, have fleshy receptacles and smaller fruits like hawthorns have seeds enclosed in edible tissue; animals including mammals and birds eat
27999-434: The soil particles and can absorb water and nutrients such as potassium in solution. The roots require oxygen to respire and only a few species such as mangroves and the pond cypress ( Taxodium ascendens ) can live in permanently waterlogged soil. In the soil, the roots encounter the hyphae of fungi. Many of these are known as mycorrhiza and form a mutualistic relationship with the tree roots. Some are specific to
28182-563: The sole control of the CCP. The CCP controls appointments in government bodies, with most senior government officials being CCP members. The National People's Congress (NPC), with nearly 3,000-members, is constitutionally the " highest organ of state power ", though it has been also described as a " rubber stamp " body. The NPC meets annually, while the NPC Standing Committee , around 150 members elected from NPC delegates, meets every couple of months. Elections are indirect and not pluralistic, with nominations at all levels being controlled by
28365-495: The south, the general Liu Yu secured the abdication of the Jin in favor of the Liu Song . The various successors of these states became known as the Northern and Southern dynasties , with the two areas finally reunited by the Sui in 581. The Sui restored the Han to power through China, reformed its agriculture, economy and imperial examination system, constructed the Grand Canal , and patronized Buddhism . However, they fell quickly when their conscription for public works and
28548-443: The standardization of Chinese characters, measurements , road widths, and currency . His dynasty also conquered the Yue tribes in Guangxi , Guangdong , and Northern Vietnam . The Qin dynasty lasted only fifteen years, falling soon after the First Emperor's death. Following widespread revolts during which the imperial library was burned , the Han dynasty emerged to rule China between 206 BCE and 220 CE, creating
28731-471: The start of the dry season. Many deciduous trees flower before the new leaves emerge. A few trees do not have true leaves but instead have structures with similar external appearance such as Phylloclades – modified stem structures – as seen in the genus Phyllocladus . Trees can be pollinated either by wind or by animals, mostly insects. Many angiosperm trees are insect pollinated. Wind pollination may take advantage of increased wind speeds high above
28914-413: The surviving seeds germinate in the spring. Pine cones may similarly be hoarded by red squirrels , and grizzly bears may help to disperse the seed by raiding squirrel caches. The seeds of conifers, the largest group of gymnosperms, are enclosed in a cone and most species have seeds that are light and papery that can be blown considerable distances once free from the cone. Sometimes the seed remains in
29097-661: The temperature begins to decrease, the leaves no longer make new chlorophyll and the red and yellow pigments already present in the blades become apparent. Synthesis in the leaf of a plant hormone called auxin also ceases. This causes the cells at the junction of the petiole and the twig to weaken until the joint breaks and the leaf floats to the ground. In tropical and subtropical regions, many trees keep their leaves all year round. Individual leaves may fall intermittently and be replaced by new growth but most leaves remain intact for some time. Other tropical species and those in arid regions may shed all their leaves annually, such as at
29280-458: The time of the Warring States period of the 5th–3rd centuries BCE, there were seven major powerful states left. The Warring States period ended in 221 BCE after the state of Qin conquered the other six states, reunited China and established the dominant order of autocracy . King Zheng of Qin proclaimed himself the Emperor of the Qin dynasty , becoming the first emperor of a unified China. He enacted Qin's legalist reforms, notably
29463-491: The tree in the spring as squirrels break off infected tissue and eat the galls, possibly for the protein content or because the galls are fleshy and tasty to the squirrels. The pecan gall curculio ( Conotrachelus elegans ) is a true weevil species also found feeding on galls of the hickory leaf stem gall phylloxera. The banded hickory borer ( Knulliana cincta ) is also found on hickories. Dried hickory nuts are 3% water, 18% carbohydrates , 13% protein , and 64% fats . In
29646-408: The tree, but some tree species have evolved roots that are aerial . The common purposes for aerial roots may be of two kinds, to contribute to the mechanical stability of the tree, and to obtain oxygen from air. An instance of mechanical stability enhancement is the red mangrove that develops prop roots that loop out of the trunk and branches and descend vertically into the mud. A similar structure
29829-432: The tree. It is a soft spongy layer of living cells, some of which are arranged end to end to form tubes. These are supported by parenchyma cells which provide padding and include fibres for strengthening the tissue. Inside the phloem is a layer of undifferentiated cells one cell thick called the vascular cambium layer. The cells are continually dividing, creating phloem cells on the outside and wood cells known as xylem on
30012-492: The tropics or sub-tropics , 0.61 trillion (20%) in the temperate zones , and 0.74 trillion (24%) in the coniferous boreal forests . The estimate is about eight times higher than previous estimates, and is based on tree densities measured on over 400,000 plots. It remains subject to a wide margin of error, not least because the samples are mainly from Europe and North America. The estimate suggests that about 15 billion trees are cut down annually and about 5 billion are planted. In
30195-403: The vascular system which interconnects all the living cells. In trees and other plants that develop wood, the vascular cambium allows the expansion of vascular tissue that produces woody growth. Because this growth ruptures the epidermis of the stem, woody plants also have a cork cambium that develops among the phloem. The cork cambium gives rise to thickened cork cells to protect the surface of
30378-424: The war ended. In 1949, the resurgent Communists established control over most of the country, proclaiming the People's Republic of China and forcing the Nationalist government to retreat to the island of Taiwan . The country was split, with both sides claiming to be the sole legitimate government of China . Following the implementation of land reforms , further attempts by the PRC to realize communism failed:
30561-429: The water depth and creating suitable conditions for further mangrove colonisation. Thus mangrove swamps tend to extend seawards in suitable locations. Mangrove swamps also provide an effective buffer against the more damaging effects of cyclones and tsunamis. Trees are the source of many of the world's best known fleshy fruits. Apples, pears, plums, cherries and citrus are all grown commercially in temperate climates and
30744-437: The wind. Ash trees and maples have larger seeds with blade shaped wings which spiral down to the ground when released. The kapok tree has cottony threads to catch the breeze. The flame tree Delonix regia shoots its seeds through the air when the two sides of its long pods crack apart explosively on drying. The miniature cone-like catkins of alder trees produce seeds that contain small droplets of oil that help disperse
30927-399: The world's largest economy by PPP-adjusted GDP , the second-largest economy by nominal GDP , and the second-wealthiest country , albeit ranking poorly in measures of democracy , human rights and religious freedom . The country has been one of the fastest-growing major economies and is the world's largest manufacturer and exporter , as well as the second-largest importer . China is
31110-485: The world), 1,221 species of birds (eighth), 424 species of reptiles (seventh) and 333 species of amphibians (seventh). Wildlife in China shares habitat with, and bears acute pressure from, one of the world's largest population of humans. At least 840 animal species are threatened, vulnerable or in danger of local extinction , due mainly to human activity such as habitat destruction, pollution and poaching for food, fur and traditional Chinese medicine . Endangered wildlife
31293-428: The world), 13.2% from hydroelectric power (largest), 9.4% from wind (largest), 6.2% from solar energy (largest), 4.6% from nuclear energy (second-largest), 3.3% from natural gas (fifth-largest), and 2.2% from bioenergy (largest); in total, 31% of China's energy came from renewable energy sources. Despite its emphasis on renewables, China remains deeply connected to global oil markets and next to India, has been
31476-465: The world, forests are shrinking as trees are cleared to increase the amount of land available for agriculture. Because of their longevity and usefulness, trees have always been revered, with sacred groves in various cultures, and they play a role in many of the world's mythologies . Although "tree" is a common word, there is no universally recognised precise definition of what a tree is, either botanically or in common language. In its broadest sense,
31659-769: The world, fruit is gathered from forest trees for consumption. Many trees bear edible nuts which can loosely be described as being large, oily kernels found inside a hard shell. These include coconuts ( Cocos nucifera ), Brazil nuts ( Bertholletia excelsa ), pecans ( Carya illinoinensis ), hazel nuts ( Corylus ), almonds ( Prunus dulcis ), walnuts ( Juglans regia ), pistachios ( Pistacia vera ) and many others. They are high in nutritive value and contain high-quality protein, vitamins and minerals as well as dietary fibre. A variety of nut oils are extracted by pressing for culinary use; some such as walnut, pistachio and hazelnut oils are prized for their distinctive flavours, but they tend to spoil quickly. In temperate climates there
31842-453: Was wiped out by the KMT armies in 1934, leading the CCP to initiate the Long March and relocate to Yan'an in Shaanxi . It would be the base of the communists before major combat in the Chinese Civil War ended in 1949. In 1931, Japan invaded and occupied Manchuria . Japan invaded other parts of China in 1937, precipitating the Second Sino-Japanese War (1937–1945), a theater of World War II . The war forced an uneasy alliance between
32025-406: Was captured by a coalition of peasant rebel forces led by Li Zicheng . The Chongzhen Emperor committed suicide when the city fell. The Manchu Qing dynasty , then allied with Ming dynasty general Wu Sangui , overthrew Li's short-lived Shun dynasty and subsequently seized control of Beijing, which became the new capital of the Qing dynasty. The Qing dynasty, which lasted from 1644 until 1912,
32208-417: Was devastated and weakened by the An Lushan rebellion in the 8th century. In 907, the Tang disintegrated completely when the local military governors became ungovernable. The Song dynasty ended the separatist situation in 960, leading to a balance of power between the Song and the Liao dynasty . The Song was the first government in world history to issue paper money and the first Chinese polity to establish
32391-414: Was first used in early Hindu scripture, including the Mahabharata (5th century BCE) and the Laws of Manu (2nd century BCE). In 1655, Martino Martini suggested that the word China is derived ultimately from the name of the Qin dynasty (221–206 BCE). Although use in Indian sources precedes this dynasty, this derivation is still given in various sources. The origin of the Sanskrit word
32574-436: Was mixed with maple bark, it produced a yellow dye pigment. The ashes of burnt hickory wood were traditionally used to produce a strong lye (potash) fit for soapmaking . The nuts of some species are palatable, while others are bitter and only suitable for animal feed. Hickory nuts were a significant food source for indigenous peoples of the Eastern Woodlands of North America since the middle Archaic period. They were used by
32757-448: Was not used by the Chinese themselves during this period. Its origin has been traced through Portuguese , Malay , and Persian back to the Sanskrit word Cīna , used in ancient India . "China" appears in Richard Eden 's 1555 translation of the 1516 journal of the Portuguese explorer Duarte Barbosa . Barbosa's usage was derived from Persian Chīn ( چین ), which in turn derived from Sanskrit Cīna ( चीन ). Cīna
32940-408: Was rebuked, with millions rehabilitated. Deng Xiaoping took power in 1978, and instituted large-scale political and economic reforms , together with the " Eight Elders ", most senior and influential members of the party. The government loosened its control and the communes were gradually disbanded. Agricultural collectivization was dismantled and farmlands privatized. While foreign trade became
33123-492: Was strengthened in part to suppress anti-Qing sentiment with the policy of valuing agriculture and restraining commerce, like the Haijin during the early Qing period and ideological control as represented by the literary inquisition , causing some social and technological stagnation. In the mid-19th century, the Opium Wars with Britain and France forced China to pay compensation, open treaty ports, allow extraterritoriality for foreign nationals, and cede Hong Kong to
33306-400: Was the earliest known tree. Both of these reproduced by spores rather than seeds and are considered to be links between ferns and the gymnosperms which evolved in the Triassic period. The gymnosperms include conifers, cycads, gnetales and ginkgos and these may have appeared as a result of a whole genome duplication event which took place about 319 million years ago. Ginkgophyta was once
33489-422: Was the last imperial dynasty of China. The Ming-Qing transition (1618–1683) cost 25 million lives, but the Qing appeared to have restored China's imperial power and inaugurated another flowering of the arts. After the Southern Ming ended, the further conquest of the Dzungar Khanate added Mongolia, Tibet and Xinjiang to the empire. Meanwhile, China's population growth resumed and shortly began to accelerate. It
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