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96-668: The Kopuatai Peat Dome is a large peatland complex on the Hauraki Plains in the North Island of New Zealand . It consists of two raised domes, one in the north and the other in the south, that are up to three metres higher at the center than at the edge. The 10,201 hectares (25,210 acres) wetland contains the largest intact raised bog in New Zealand and was listed under the Ramsar Convention in 1989 as

192-456: A fen (or, on acidic substrates, valley bog), to a carr , as silt or peat accumulates within the lake. Eventually, peat builds up to a level where the land surface is too flat for ground or surface water to reach the center of the wetland. This part, therefore, becomes wholly rain-fed (ombrotrophic), and the resulting acidic conditions allow the development of bog (even if the substrate is non-acidic). The bog continues to form peat, and over time

288-425: A Wetland of International Importance. Most of the wetland is ombrotrophic , meaning it receives water and nutrient inputs solely from rain and is hydrologically isolated from the surrounding canals and rivers. Locally, a popular misconception persists that water flows from the nearby Piako River into the bog and that the wetland acts as a significant store for floodwater. Kopuatai has survived extensive draining of

384-497: A broad definition: Because all bogs have peat, they are a type of peatland. As a peat-producing ecosystem, they are also classified as mires , along with fens. Bogs differ from fens, in that fens receive water and nutrients from mineral-rich surface or groundwater, while bogs receive water and nutrients from precipitation. Because fens are supplied with mineral-rich water, they tend to range from slightly acidic to slightly basic, while bogs are always acidic because precipitation lacks

480-812: A butterfly called the bog copper ( Lycaena epixanthe ). In Ireland, the viviparous lizard , the only known reptile in the country, dwells in bogland. The United Kingdom in its Biodiversity Action Plan establishes bog habitats as a priority for conservation. Russia has a large reserve system in the West Siberian Lowland . The highest protected status occurs in Zapovedniks ( IUCN category IV); Gydansky and Yugansky are two prominent examples. Bogs are fragile ecosystems, and have been deteriorating quickly, as archaeologists and scientists have been recently finding. Bone material found in bogs has had accelerated deterioration from first analyses in

576-612: A characteristic brown colour, which comes from dissolved peat tannins . In general, the low fertility and cool climate result in relatively slow plant growth, but decay is even slower due to low oxygen levels in saturated bog soils. Hence, peat accumulates. Large areas of the landscape can be covered many meters deep in peat. Bogs have distinctive assemblages of animal, fungal, and plant species, and are of high importance for biodiversity , particularly in landscapes that are otherwise settled and farmed. Bogs are widely distributed in cold, temperate climes , mostly in boreal ecosystems in

672-604: A consequence of changes in physical and chemical compositions. The change in soil strongly affects the sensitive vegetation and forest die-off is common. The short-term effect is a decrease in biodiversity but the long-term effect, since these encroachments are hard to reverse, is a loss of habitat. Poor knowledge about peatlands' sensitive hydrology and lack of nutrients often lead to failing plantations, resulting in increasing pressure on remaining peatlands. Tropical peatland vegetation varies with climate and location. Three different characterizations are mangrove woodlands present in

768-687: A greater carbon sequestration capacity. The carbon sequestration abilities of wetlands can be improved through restoration and protection strategies, but it takes several decades for these restored ecosystems to become comparable in carbon storage to peatlands and other forms of natural wetlands. Studies highlight the critical role of peatlands in biodiversity conservation and hydrological stability. These ecosystems are unique habitats for diverse species , including specific insects and amphibians , and act as natural water reservoirs , releasing water during dry periods to sustain nearby freshwater ecosystems and agriculture . The exchange of carbon between

864-424: A net cooling effect on the atmosphere. The water table position of a peatland is the main control of its carbon release to the atmosphere. When the water table rises after a rainstorm, the peat and its microbes are submerged under water inhibiting access to oxygen, reducing CO 2 release via respiration. Carbon dioxide release increases when the water table falls lower, such as during a drought, as this increases

960-534: A number of governmental and conservation agencies. They can provide habitat for mammals, such as caribou , moose , and beavers , as well as for species of nesting shorebirds, such as Siberian cranes and yellowlegs . Bogs contain species of vulnerable reptilians such as the bog turtle . Bogs even have distinctive insects; English bogs give a home to a yellow fly called the hairy canary fly ( Phaonia jaroschewskii ), and bogs in North America are habitat for

1056-450: A peatland can be dry). A peatland that is still capable of forming new peat is called a mire , while drained and converted peatlands might still have a peat layer but are not considered mires as the formation of new peat has ceased. There are two types of mire: bog and fen . A bog is a mire that, due to its raised location relative to the surrounding landscape, obtains all its water solely from precipitation ( ombrotrophic ). A fen

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1152-419: A quarter of global peatland area. This involves cutting drainage ditches to lower the water table with the intended purpose of enhancing the productivity of forest cover or for use as pasture or cropland. Agricultural uses for mires include the use of natural vegetation for hay crop or grazing, or the cultivation of crops on a modified surface. In addition, the commercial extraction of peat for energy production

1248-649: A result of developing land use and agriculture. During the El Niño -event in 1997–1998 more than 24,400 km of peatland was lost to fires in Indonesia alone from which 10,000 km was burnt in Kalimantan and Sumatra. The output of CO 2 was estimated to 0.81–2.57 Gt, equal to 13–40% of that year's global output from fossil fuel burning. Indonesia is now considered the third-biggest contributor to global CO 2 emissions, caused primarily by these fires. With

1344-527: A roothold. The result is a narrow, permanently wet habitat. After drying, peat is used as a fuel , and it has been used that way for centuries. More than 20% of home heat in Ireland comes from peat, and it is also used for fuel in Finland, Scotland, Germany, and Russia. Russia is the leading exporter of peat for fuel, at more than 90 million metric tons per year. Ireland's Bord na Móna ("peat board")

1440-561: A severe fire can release up to 4,000 t of CO 2 /ha. Burning events in tropical peatlands are becoming more frequent due to large-scale drainage and land clearance and in the past ten years, more than 2 million hectares was burnt in Southeast Asia alone. These fires last typically for 1–3 months and release large amounts of CO 2 . Indonesia is one of the countries suffering from peatland fires, especially during years with ENSO -related drought, an increasing problem since 1982 as

1536-402: A shallow dome of bog peat develops into a raised bog. The dome is typically a few meters high in the center and is often surrounded by strips of fen or other wetland vegetation at the edges or along streamsides where groundwater can percolate into the wetland. The various types of raised bog may be divided into: In cool climates with consistently high rainfall (on more than c. 235 days a year),

1632-464: A small atmospheric carbon dioxide sink through the photosynthesis of peat vegetation, which outweighs their release of greenhouse gases. On the other hand, most mires are generally net emitters of methane and nitrous oxide. Due to the continued CO 2 sequestration over millennia, and because of the longer atmospheric lifespan of the CO 2 molecules compared with methane and nitrous oxide, peatlands have had

1728-477: A substantial amount of organic matter, where humic acid dominates. Humic materials are able to store very large amounts of water, making them an essential component in the peat environment, contributing to an increased amount of carbon storage due to the resulting anaerobic condition. If the peatland is dried from long-term cultivation and agricultural use, it will lower the water table and the increased aeration will subsequently release carbon. Upon extreme drying,

1824-490: A warming climate these burnings are expected to increase in intensity and number. This is a result of a dry climate together with an extensive rice farming project, called the Mega Rice Project , started in the 1990s, which converted 1 Mha of peatlands to rice paddies . Forest and land was cleared by burning and 4000 km of channels drained the area. Drought and acidification of the lands led to bad harvest and

1920-433: A way that preserves the hydrological state of a mire, the anthropogenic use of mires' resources can avoid significant greenhouse gas emissions . However, continued drainage will result in increased release of carbon, contributing to global warming. As of 2016, it was estimated that drained peatlands account for around 10% of all greenhouse gas emissions from agriculture and forestry. Palm oil has increasingly become one of

2016-545: Is blanket bog where precipitation is very high i.e., in maritime climates inland near the coasts of the north-east and south Pacific, and the north-west and north-east Atlantic. In the sub-tropics, mires are rare and restricted to the wettest areas. Mires can be extensive in the tropics, typically underlying tropical rainforest (for example, in Kalimantan , the Congo Basin and Amazon basin ). Tropical peat formation

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2112-564: Is a wetland that accumulates peat as a deposit of dead plant materials – often mosses , typically sphagnum moss. It is one of the four main types of wetlands . Other names for bogs include mire , mosses, quagmire, and muskeg ; alkaline mires are called fens . A bayhead is another type of bog found in the forest of the Gulf Coast states in the United States. They are often covered in heath or heather shrubs rooted in

2208-435: Is actively forming peat is called a mire . All types of mires share the common characteristic of being saturated with water, at least seasonally with actively forming peat , while having their own ecosystem. Peatlands are the largest natural carbon store on land. Covering around 3 million km globally, they sequester 0.37 gigatons (Gt) of carbon dioxide (CO 2 ) a year. Peat soils store over 600 Gt of carbon, more than

2304-411: Is especially prevalent in the tropics. Peatlands release the greenhouse gas methane which has strong global warming potential . However, subtropical wetlands have shown high CO 2 binding per mol of released methane, which is a function that counteracts global warming. Tropical peatlands are suggested to contain about 100 Gt carbon, corresponding to more than 50% of the carbon present as CO 2 in

2400-496: Is estimated to be between the equivalent of 12.4 (best case) to 76.6 t CO 2 /ha (worst case). Tropical peatland converted to palm oil plantation can remain a net source of carbon to the atmosphere after 12 years. In their natural state, peatlands are resistant to fire. Drainage of peatlands for palm oil plantations creates a dry layer of flammable peat. As peat is carbon dense, fires occurring in compromised peatlands release extreme amounts of both carbon dioxide and toxic smoke into

2496-659: Is forbidden in Chile since April 2024. The Global Peatlands Initiative is an effort made by leading experts and institutions formed in 2016 by 13 founding members at the UNFCCC COP in Marrakech, Morocco. The mission of the Initiative is to protect and conserve peatlands as the world's largest terrestrial organic carbon stock and to prevent it from being emitted into the atmosphere. Bog A bog or bogland

2592-544: Is found in the temperate, boreal and subarctic zones of the Northern Hemisphere. Mires are usually shallow in polar regions because of the slow rate of accumulation of dead organic matter, and often contain permafrost and palsas . Very large swathes of Canada, northern Europe and northern Russia are covered by boreal mires. In temperate zones mires are typically more scattered due to historical drainage and peat extraction, but can cover large areas. One example

2688-616: Is known to occur in coastal mangroves as well as in areas of high altitude. Tropical mires largely form where high precipitation is combined with poor conditions for drainage. Tropical mires account for around 11% of peatlands globally (more than half of which can be found in Southeast Asia), and are most commonly found at low altitudes, although they can also be found in mountainous regions, for example in South America, Africa and Papua New Guinea . Indonesia, particularly on

2784-427: Is located on a slope, flat, or in a depression and gets most of its water from the surrounding mineral soil or from groundwater ( minerotrophic ). Thus, while a bog is always acidic and nutrient-poor, a fen may be slightly acidic, neutral, or alkaline, and either nutrient-poor or nutrient-rich. All mires are initially fens when the peat starts to form, and may turn into bogs once the height of the peat layer reaches above

2880-534: Is oxidised by methanotrophs above the water table level. Therefore, changes in water table level influence the size of these methane production and consumption zones. Increased soil temperatures also contribute to increased seasonal methane flux. A study in Alaska found that methane may vary by as much as 300% seasonally with wetter and warmer soil conditions due to climate change. Peatlands are important for studying past climate because they are sensitive to changes in

2976-527: Is oxidised quickly and removed from the atmosphere whereas atmospheric carbon dioxide is continuously absorbed. Throughout the Holocene (the past 12,000 years), peatlands have been persistent terrestrial carbon sinks and have had a net cooling effect, sequestering 5.6 to 38 grams of carbon per square metre per year. On average, it has been estimated that today northern peatlands sequester 20 to 30 grams of carbon per square metre per year. Peatlands insulate

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3072-399: Is primarily controlled by climatic conditions such as precipitation and temperature, although terrain relief is a major factor as waterlogging occurs more easily on flatter ground and in basins. Peat formation typically initiates as a paludification of a mineral soil forests, terrestrialisation of lakes, or primary peat formation on bare soils on previously glaciated areas. A peatland that

3168-407: Is remarkable for being an exceptionally strong sink for carbon dioxide compared to other bogs globally. Carbon dioxide is absorbed from the atmosphere by the peat-forming plants and transformed into peat which can be up to 12 meters thick in parts of the bog. 37°26′S 175°33′E  /  37.433°S 175.550°E  / -37.433; 175.550 Mire The formation of peatlands

3264-585: Is stored in living plants, dead plants and peat, as well as converted to carbon dioxide and methane. Three main factors give wetlands the ability to sequester and store carbon: high biological productivity, high water table and low decomposition rates. Suitable meteorological and hydrological conditions are necessary to provide an abundant water source for the wetland. Fully water-saturated wetland soils allow anaerobic conditions to manifest, storing carbon but releasing methane. Wetlands make up about 5-8% of Earth's terrestrial land surface but contain about 20-30% of

3360-451: Is therefore vulnerable to changes in hydrology or vegetation cover. These peatlands are mostly located in developing regions with impoverished and rapidly growing populations. These lands have become targets for commercial logging , paper pulp production and conversion to plantations through clear-cutting , drainage and burning. Drainage of tropical peatlands alters the hydrology and increases their susceptibility to fire and soil erosion, as

3456-584: Is widely practiced in Northern European countries, such as Russia, Sweden, Finland, Ireland and the Baltic states . Tropical peatlands comprise 0.25% of Earth's terrestrial land surface but store 3% of all soil and forest carbon stocks. The use of this land by humans, including draining and harvesting of tropical peat forests, results in the emission of large amounts of carbon dioxide into the atmosphere. In addition, fires occurring on peatland dried by

3552-675: The Haraldskær Woman and Tollund Man in Denmark, and Lindow man found at Lindow Common in England. The Tollund Man was so well preserved that when the body was discovered in 1950, the discoverers thought it was a recent murder victim and researchers were even able to tell the last meal that the Tollund Man ate before he died: porridge and fish. This process happens because of the low oxygen levels of bogs in combination with

3648-1318: The Northern Hemisphere . The world's largest wetland is the peat bogs of the Western Siberian Lowlands in Russia , which cover more than a million square kilometres. Large peat bogs also occur in North America, particularly the Hudson Bay Lowland and the Mackenzie River Basin. They are less common in the Southern Hemisphere, with the largest being the Magellanic moorland , comprising some 44,000 square kilometres (17,000 sq mi) in southern South America. Sphagnum bogs were widespread in northern Europe but have often been cleared and drained for agriculture. A paper led by Graeme T. Swindles in 2019 showed that peatlands across Europe have undergone rapid drying in recent centuries owing to human impacts including drainage, peat cutting and burning. A 2014 expedition leaving from Itanga village, Republic of

3744-464: The barley used in making Scotch whisky . Once the peat has been extracted it can be difficult to restore the wetland , since peat accumulation is a slow process. More than 90% of the bogs in England have been damaged or destroyed. In 2011 plans for the elimination of peat in gardening products were announced by the UK government. The peat in bogs is an important place for the storage of carbon. If

3840-565: The permafrost in subarctic regions, thus delaying thawing during summer, as well as inducing the formation of permafrost. As the global climate continues to warm, wetlands could become major carbon sources as higher temperatures cause higher carbon dioxide emissions. Compared with untilled cropland, wetlands can sequester around two times the carbon. Carbon sequestration can occur in constructed wetlands as well as natural ones. Estimates of greenhouse gas fluxes from wetlands indicate that natural wetlands have lower fluxes, but man-made wetlands have

3936-416: The 1940s. This has been found to be from fluctuations in ground water and increase in acidity in lower areas of bogs that is affecting the rich organic material. Many of these areas have been permeated to the lowest levels with oxygen, which dries and cracks layers. There have been some temporary solutions to try and fix these issues, such as adding soil to the tops of threatened areas, yet they do not work in

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4032-690: The Central Congo Basin , covering 145,500 km and storing up to 10 kg of carbon. The total area of mires has declined globally due to drainage for agriculture, forestry and peat harvesting. For example, more than 50% of the original European mire area which is more than 300,000 km has been lost. Some of the largest losses have been in Russia, Finland, the Netherlands, the United Kingdom, Poland and Belarus. A catalog of

4128-523: The Congo , discovered a peat bog "as big as England " which stretches into neighboring Democratic Republic of Congo . Like all wetlands, it is difficult to rigidly define bogs for a number of reasons, including variations between bogs, the in-between nature of wetlands as an intermediate between terrestrial and aquatic ecosystems, and varying definitions between wetland classification systems. However, there are characteristics common to all bogs that provide

4224-635: The Northern Hemisphere. Peatlands are estimated to cover around 3% of the globe's surface, although estimating the extent of their cover worldwide is difficult due to the varying accuracy and methodologies of land surveys from many countries. Mires occur wherever conditions are right for peat accumulation: largely where organic matter is constantly waterlogged. Hence the distribution of mires is dependent on topography , climate, parent material, biota and time. The type of mire—bog, fen, marsh or swamp—depends also on each of these factors. The largest accumulation of mires constitutes around 64% of global peatlands and

4320-476: The air. These fires add to greenhouse gas emissions while also causing thousands of deaths every year. Decreased biodiversity due to deforestation and drainage makes these ecosystem more vulnerable and less resilient to change. Homogenous ecosystems are at an increased risk to extreme climate conditions and are less likely to recover from fires. Some peatlands are being dried out by climate change . Drainage of peatlands due to climatic factors may also increase

4416-454: The atmosphere primarily through the exchange of carbon dioxide , methane and nitrous oxide , and can be damaged by excess nitrogen from agriculture or rainwater. The sequestration of carbon dioxide takes place at the surface via the process of photosynthesis , while losses of carbon dioxide occur through living plants via autotrophic respiration and from the litter and peat via heterotrophic respiration. In their natural state, mires are

4512-463: The atmosphere. Accumulation rates of carbon during the last millennium were close to 40 g C/m /yr. Northern peatlands are associated with boreal and subarctic climates. Northern peatlands were mostly built up during the Holocene after the retreat of Pleistocene glaciers, but in contrast tropical peatlands are much older. Total northern peat carbon stocks are estimated to be 1055 Gt of carbon. Of all northern circumpolar countries, Russia has

4608-444: The availability of oxygen to the aerobic microbes thus accelerating peat decomposition. Levels of methane emissions also vary with the water table position and temperature. A water table near the peat surface gives the opportunity for anaerobic microorganisms to flourish. Methanogens are strictly anaerobic organisms and produce methane from organic matter in anoxic conditions below the water table level, while some of that methane

4704-505: The carbon stored in all other vegetation types, including forests. This substantial carbon storage represents about 30% of the world's soil carbon , underscoring their critical importance in the global carbon cycle . In their natural state, peatlands provide a range of ecosystem services , including minimising flood risk and erosion, purifying water and regulating climate. Peatlands are under threat by commercial peat harvesting, drainage and conversion for agriculture (notably palm oil in

4800-518: The combination of low nutrient levels and waterlogging. Sphagnum is generally abundant, along with ericaceous shrubs. The shrubs are often evergreen, which may assist in conservation of nutrients. In drier locations, evergreen trees can occur, in which case the bog blends into the surrounding expanses of boreal evergreen forest. Sedges are one of the more common herbaceous species. Carnivorous plants such as sundews ( Drosera ) and pitcher plants (for example Sarracenia purpurea ) have adapted to

4896-406: The conversion of organics to carbon dioxide to be released in the atmosphere. Records of past human behaviour and environments can be contained within peatlands. These may take the form of human artefacts, or palaeoecological and geochemical records. Peatlands are used by humans in modern times for a range of purposes, the most dominant being agriculture and forestry, which accounts for around

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4992-400: The deepest part of the valley, and a stream may run through the surface of the bog. Valley bogs may develop in relatively dry and warm climates, but because they rely on ground or surface water, they only occur on acidic substrates. These develop from a lake or flat marshy area, over either non-acidic or acidic substrates. Over centuries there is a progression from open lake, to a marsh, to

5088-558: The dissolved minerals (e.g. calcium , magnesium , carbonate ) that act to buffer the natural acidity of atmospheric carbon dioxide . Geography and geology both impact the hydrology: as groundwater mineral content reflects the bedrock geology, there can be great deal of variability in some common ions (e.g. manganese , iron ) while proximity to coastal areas is associated with higher sulfate and sodium concentrations. There are many highly specialized animals, fungi, and plants associated with bog habitat. Most are capable of tolerating

5184-484: The draining of peat bogs release even more carbon dioxide. The economic value of a tropical peatland was once derived from raw materials, such as wood, bark, resin and latex, the extraction of which did not contribute to large carbon emissions. In Southeast Asia, peatlands are drained and cleared for human use for a variety of reasons, including the production of palm oil and timber for export in primarily developing nations. This releases stored carbon dioxide and preventing

5280-406: The ecosystem can undergo a state shift, turning the mire into a barren land with lower biodiversity and richness. The formation of humic acid occurs during the biogeochemical degradation of vegetation debris, animal residue and degraded segments. The loads of organic matter in the form of humic acid is a source of precursors of coal. Prematurely exposing the organic matter to the atmosphere promotes

5376-460: The edges of acidic lakes. The bog vegetation, mostly sphagnum moss anchored by sedges (such as Carex lasiocarpa ), forms a floating mat approximately half a meter thick on the surface of water or above very wet peat. White spruce ( Picea glauca ) may grow in this bog regime. Walking on the surface causes it to move – larger movements may cause visible ripples on the surface, or they may even make trees sway. The bog mat may eventually spread across

5472-478: The emission of methane, which is a strong greenhouse gas. However, given the short "lifetime" of methane (12 years), it is often said that methane emissions are unimportant within 300 years compared to carbon sequestration in wetlands. Within that time frame or less, most wetlands become both net carbon and radiative sinks. Hence, peatlands do result in cooling of the Earth's climate over a longer time period as methane

5568-628: The environment and can reveal levels of isotopes , pollutants, macrofossils , metals from the atmosphere and pollen. For example, carbon-14 dating can reveal the age of the peat. The dredging and destruction of a peatland will release the carbon dioxide that could reveal irreplaceable information about the past climatic conditions. Many kinds of microorganisms inhabit peatlands, due to the regular supply of water and abundance of peat forming vegetation. These microorganisms include but are not limited to methanogens , algae, bacteria, zoobenthos , of which Sphagnum species are most abundant. Peat contains

5664-553: The global average. Because bogs and other peatlands are carbon sinks, they are releasing large amounts of greenhouse gases as they warm up. These changes have resulted in a severe decline of biodiversity and species populations of peatlands throughout Northern Europe. Bog habitats may develop in various situations, depending on the climate and topography. Bogs may be classified on their topography, proximity to water, method of recharge, and nutrient accumulation. These develop in gently sloping valleys or hollows. A layer of peat fills

5760-434: The ground surface above the original topography. Mires can reach considerable heights above the underlying mineral soil or bedrock : peat depths of above 10 m have been commonly recorded in temperate regions (many temperate and most boreal mires were removed by ice sheets in the last Ice Age), and above 25 m in tropical regions. When the absolute decay rate of peat in the catotelm (the lower, water-saturated zone of

5856-421: The ground surface may remain waterlogged for much of the time, providing conditions for the development of bog vegetation . In these circumstances, bog develops as a layer "blanketing" much of the land, including hilltops and slopes. Although a blanket bog is more common on acidic substrates, under some conditions it may also develop on neutral or even alkaline ones, if abundant acidic rainwater predominates over

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5952-469: The groundwater. A blanket bog can occur in drier or warmer climates, because under those conditions hilltops and sloping ground dry out too often for peat to form – in intermediate climates a blanket bog may be limited to areas which are shaded from direct sunshine. In periglacial climates a patterned form of blanket bog may occur, known as a string bog . In Europe, these mostly very thin peat layers without significant surface structures are distributed over

6048-840: The headwaters of large rivers. Even the enormous Yangtze River arises in the Ruoergai peatland near its headwaters in Tibet . Blueberries , cranberries , cloudberries , huckleberries , and lingonberries are harvested from the wild in bogs. Bog oak , wood that has been partially preserved by bogs, has been used in the manufacture of furniture . Sphagnum bogs are also used for outdoor recreation, with activities including ecotourism and hunting. For example, many popular canoe routes in northern Canada include areas of peatland. Some other activities, such as all-terrain vehicle use, are especially damaging to bogs. The anaerobic environment and presence of tannic acids within bogs can result in

6144-521: The hills and valleys of Ireland, Scotland, England, and Norway. In North America, blanket bogs occur predominantly in Canada east of Hudson Bay . These bogs are often still under the influence of mineral soil water (groundwater). Blanket bogs do not occur north of the 65th latitude in the northern hemisphere. A quaking bog , schwingmoor , or swingmoor is a form of floating bog occurring in wetter parts of valley bogs and raised bogs and sometimes around

6240-494: The inflow of groundwater (bringing in supplementary cations) is high. Generally, whenever the inputs of carbon into the soil from dead organic matter exceed the carbon outputs via organic matter decomposition , peat is formed. This occurs due to the anoxic state of water-logged peat, which slows down decomposition. Peat-forming vegetation is typically also recalcitrant (poorly decomposing) due to high lignin and low nutrient content. Topographically , accumulating peat elevates

6336-400: The islands of Sumatra, Kalimantan and Papua, has one of the largest peatlands in the world, with an area of about 24 million hectares. These peatlands play an important role in global carbon storage and have very high biodiversity. However, peatlands in Indonesia also face major threats from deforestation and forest fires. In the early 21st century, the world's largest tropical mire was found in

6432-448: The land selected for plantations are typically substantial carbon stores that promote biodiverse ecosystems. Palm oil plantations have replaced much of the forested peatlands in Southeast Asia. Estimates now state that 12.9 Mha or about 47% of peatlands in Southeast Asia were deforested by 2006. In their natural state, peatlands are waterlogged with high water tables making for an inefficient soil. To create viable soil for plantation,

6528-752: The largest area of peatlands, and contains the largest peatland in the world, The Great Vasyugan Mire . Nakaikemi Wetland in southwest Honshu, Japan is more than 50,000 years old and has a depth of 45 m. The Philippi Peatland in Greece has probably one of the deepest peat layers with a depth of 190 m. According to the IPCC Sixth Assessment Report , the conservation and restoration of wetlands and peatlands has large economic potential to mitigate greenhouse gas emissions, providing benefits for adaptation, mitigation and biodiversity. Wetlands provide an environment where organic carbon

6624-575: The littoral zones and deltas of salty water, followed inland by swamp forests . These forests occur on the margin of peatlands with a palm rich flora with trees 70 m tall and 8 m in girth accompanied by ferns and epiphytes. The third, padang , from the Malay and Indonesian word for forest, consists of shrubs and tall thin trees and appear in the center of large peatlands. The diversity of woody species, like trees and shrubs, are far greater in tropical peatlands than in peatlands of other types. Peat in

6720-497: The long-term. Extreme weather like dry summers are likely the cause, as they lower precipitation and the groundwater table. It is speculated that these issues will only increase with a rise in global temperature and climate change. Since bogs take thousands of years to form and create the rich peat that is used as a resource, once they are gone they are extremely hard to recover. Arctic and sub-Arctic circles where many bogs are warming at 0.6 °C per decade, an amount twice as large as

6816-408: The low-nutrient conditions by using invertebrates as a nutrient source. Orchids have adapted to these conditions through the use of mycorrhizal fungi to extract nutrients. Some shrubs such as Myrica gale (bog myrtle) have root nodules in which nitrogen fixation occurs, thereby providing another supplemental source of nitrogen. Bogs are recognized as a significant/specific habitat type by

6912-470: The mires in tropical regions of Indonesia and Malaysia are drained and cleared. The peatland forests harvested for palm oil production serve as above- and below-ground carbon stores, containing at least 42,069 million metric tonnes (Mt) of soil carbon. Exploitation of this land raises many environmental concerns, namely increased greenhouse gas emissions , risk of fires and a decrease in biodiversity. Greenhouse gas emissions for palm oil planted on peatlands

7008-425: The only known food source for the rare endemic moth Houdinia flexilissima , also known as 'Fred the thread', described as recently as 2006 and remarkable for being the thinnest caterpillar in the world. A number of other undescribed insect species are thought to inhabit the peat dome. Other plant species found at Kopuatai are the peat-forming plant Empodisma robustum and the fern Gleichenia dicarpa . Kopuatai

7104-402: The other hand, is linked to poverty and is so widespread that it also has negatively impacts these peatlands. The biotic and abiotic factors controlling Southeast Asian peatlands are interdependent. Its soil, hydrology and morphology are created by the present vegetation through the accumulation of its own organic matter, building a favorable environment for this specific vegetation. This system

7200-475: The peat decays, carbon dioxide would be released to the atmosphere, contributing to global warming. Undisturbed, bogs function as a carbon sink . As one example, the peatlands of the former Soviet Union were calculated to be removing 52 Tg of carbon per year from the atmosphere. Therefore, the rewetting of drained peatlands may be one of the most cost-effective ways to mitigate climate change. Peat bogs are also important in storing fresh water, particularly in

7296-405: The peat layer) matches the rate of input of new peat into the catotelm, the mire will stop growing in height. Despite accounting for just 3% of Earth's land surfaces, peatlands are collectively a major carbon store containing between 500 and 700 billion tonnes of carbon. Carbon stored within peatlands equates to over half the amount of carbon found in the atmosphere . Peatlands interact with

7392-593: The peat research collection at the University of Minnesota Duluth provides references to research on worldwide peat and peatlands. Peatlands have unusual chemistry that influences, among other things, their biota and water outflow. Peat has very high cation-exchange capacity due to its high organic matter content: cations such as Ca are preferentially adsorbed onto the peat in exchange for H ions. Water passing through peat declines in nutrients and pH . Therefore, mires are typically nutrient-poor and acidic unless

7488-453: The peatland, and allowing natural vegetation to recover. Rehabilitation projects undertaken in North America and Europe usually focus on the rewetting of peatlands and revegetation of native species. This acts to mitigate carbon release in the short term before the new growth of vegetation provides a new source of organic litter to fuel the peat formation in the long term. UNEP is supporting peatland restoration in Indonesia. Peat extraction

7584-436: The peatlands and the atmosphere has been of current concern globally in the field of ecology and biogeochemical studies. The drainage of peatlands for agriculture and forestry has resulted in the emission of extensive greenhouse gases into the atmosphere, most notably carbon dioxide and methane. By allowing oxygen to enter the peat column within a mire, drainage disrupts the balance between peat accumulation and decomposition, and

7680-414: The planet's 2500 Gt soil carbon stores. Peatlands contain the highest amounts of soil organic carbon of all wetland types. Wetlands can become sources of carbon, rather than sinks, as the decomposition occurring within the ecosystem emits methane. Natural peatlands do not always have a measurable cooling effect on the climate in a short time span as the cooling effects of sequestering carbon are offset by

7776-407: The presence of other tall and dense vegetation like papyrus . Like fens, swamps are typically of higher pH level and nutrient availability than bogs. Some bogs and fens can support limited shrub or tree growth on hummocks . A marsh is a type of wetland within which vegetation is rooted in mineral soil. Peatlands are found around the globe, although are at their greatest extent at high latitudes in

7872-463: The project was abandoned in 1999. Similar projects in China have led to immense loss of tropical marshes and fens due to rice production. Drainage, which also increases the risk of burning, can cause additional emissions of CO 2 by 30–100 t/ha/year if the water table is lowered by only 1 m. The draining of peatlands is likely the most important and long-lasting threat to peatlands globally, but

7968-549: The remarkable preservation of organic material. Finds of such material have been made in Slovenia , Denmark , Germany , Ireland , Russia , and the United Kingdom. Some bogs have preserved bog-wood, such as ancient oak logs useful in dendrochronology . They have yielded extremely well-preserved bog bodies , with hair, organs, and skin intact, buried there thousands of years ago after apparent Germanic and Celtic human sacrifice . Excellent examples of such human specimens include

8064-412: The risk of fires, presenting further risk of carbon and methane to release into the atmosphere. Due to their naturally high moisture content, pristine mires have a generally low risk of fire ignition. The drying of this waterlogged state means that the carbon-dense vegetation becomes vulnerable to fire. In addition, due to the oxygen deficient nature of the vegetation, the peat fires can smolder beneath

8160-582: The sphagnum moss and peat. The gradual accumulation of decayed plant material in a bog functions as a carbon sink . Bogs occur where the water at the ground surface is acidic and low in nutrients. A bog usually is found at a freshwater soft spongy ground that is made up of decayed plant matter which is known as peat. They are generally found in cooler northern climates and are formed in poorly draining lake basins. In contrast to fens , they derive most of their water from precipitation rather than mineral-rich ground or surface water. Water flowing out of bogs has

8256-602: The subsequent oxidative degradation results in the release of carbon into the atmosphere. As such, drainage of mires for agriculture transforms them from net carbon sinks to net carbon emitters. Although the emission of methane from mires has been observed to decrease following drainage, the total magnitude of emissions from peatland drainage is often greater as rates of peat accumulation are low. Peatland carbon has been described as "irrecoverable" meaning that, if lost due to drainage, it could not be recovered within time scales relevant to climate mitigation. When undertaken in such

8352-596: The surface causing incomplete combustion of the organic matter and resulting in extreme emissions events. In recent years, the occurrence of wildfires in peatlands has increased significantly worldwide particularly in the tropical regions. This can be attributed to a combination of drier weather and changes in land use which involve the drainage of water from the landscape. This resulting loss of biomass through combustion has led to significant emissions of greenhouse gasses both in tropical and boreal/temperate peatlands. Fire events are predicted to become more frequent with

8448-514: The surrounding land. A quagmire is a floating (quaking) mire, bog, or any peatland being in a stage of hydrosere or hydrarch (hydroseral) succession, resulting in pond-filling yields underfoot. Ombrotrophic types of quagmire may be called quaking bog (quivering bog). Minerotrophic types can be named with the term quagfen. Some swamps can also be peatlands (e.g.: peat swamp forest ), while marshes are generally not considered to be peatlands. Swamps are characterized by their forest canopy or

8544-476: The system from sequestering carbon again. The global distribution of tropical peatlands is concentrated in Southeast Asia where agricultural use of peatlands has been increased in recent decades. Large areas of tropical peatland have been cleared and drained for the production of food and cash crops such as palm oil. Large-scale drainage of these plantations often results in subsidence , flooding, fire and deterioration of soil quality . Small scale encroachment on

8640-842: The tropics is therefore dominated by woody material from trunks of trees and shrubs and contain little to none of the sphagnum moss that dominates in boreal peatlands. It's only partly decomposed and the surface consists of a thick layer of leaf litter. Forestry in peatlands leads to drainage and rapid carbon losses since it decreases inputs of organic matter and accelerate the decomposition. In contrast to temperate wetlands, tropical peatlands are home to several species of fish. Many new, often endemic, species has been discovered but many of them are considered threatened. The tropical peatlands in Southeast Asia only cover 0.2% of Earth's land area but CO 2 emissions are estimated to be 2 Gt per year, equal to 7% of global fossil fuel emissions. These emissions get bigger with drainage and burning of peatlands and

8736-421: The tropics) and fires, which are predicted to become more frequent with climate change . The destruction of peatlands results in release of stored greenhouse gases into the atmosphere, further exacerbating climate change. For botanists and ecologists, the term peatland is a general term for any terrain dominated by peat to a depth of at least 30 cm (12 in), even if it has been completely drained (i.e.,

8832-436: The warming and drying of the global climate. The United Nations Convention on Biological Diversity highlights peatlands as key ecosystems to be conserved and protected. The convention requires governments at all levels to present action plans for the conservation and management of wetland environments. Wetlands are also protected under the 1971 Ramsar Convention . Often, restoration is done by blocking drainage channels in

8928-401: The water surface to cover bays or even entire small lakes. Bogs at the edges of lakes may become detached and form floating islands . A cataract bog is a rare ecological community formed where a permanent stream flows over a granite outcropping. The sheeting of water keeps the edges of the rock wet without eroding the soil, but in this precarious location, no tree or large shrub can maintain

9024-492: The wetlands on the Hauraki Plains and was given protection in 1987 when it came under the administration of the newly formed Department of Conservation . Kopuatai contains the largest remaining population of Sporadanthus ferrugineus , a peat-forming plant that was once widespread in the upper North Island, but is now found in only a few places, in the Hauraki Plains and Waikato basin. S. ferrugineus in turn provides

9120-513: The world's largest crops. In comparison to alternatives, palm oil is considered to be among the most efficient sources of vegetable oil and biofuel , requiring only 0.26 hectares of land to produce 1 ton of oil. Palm oil has therefore become a popular cash crop in many low-income countries and has provided economic opportunities for communities. With palm oil as a leading export in countries such as Indonesia and Malaysia, many smallholders have found economic success in palm oil plantations. However,

9216-452: Was one of the first companies to mechanically harvest peat, which is being phased out. The other major use of dried peat is as a soil amendment (sold as moss peat or sphagnum peat ) to increase the soil's capacity to retain moisture and enrich the soil. It is also used as a mulch . Some distilleries , notably in the Islay whisky-producing region, use the smoke from peat fires to dry

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