Peatland

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A variety of mire types in Carbajal Valley, Argentina ARG-2016-Aerial-Tierra del Fuego (Ushuaia)-Valle Carbajal 01.jpg
A variety of mire types in Carbajal Valley, Argentina
Avaste Fen, one of the largest fens in Estonia Avaste soo pohjaosa vaated (3).JPG
Avaste Fen, one of the largest fens in Estonia

A peatland is a type of wetland whose soils consist of organic matter from decaying plants, forming layers of peat. Peatlands arise because of incomplete decomposition of organic matter, usually litter from vegetation, due to water-logging and subsequent anoxia. [1] Like coral reefs, peatlands are unusual landforms that derive mostly from biological rather than physical processes, and can take on characteristic shapes and surface patterning.

Contents

The formation of peatlands 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. [2] 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. [3] A peatland that 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. [4]

Peatlands are the largest natural carbon store on land. Covering around 3 million km2 globally, they sequester 0.37 gigatons (Gt) of carbon dioxide (CO2) a year. Peat soils store over 600Gt of carbon, more than the carbon stored in all other vegetation types, including forests. In their natural state, peatlands provide a range of ecosystem services, including minimising flood risk and erosion, purifying water and regulating climate. [5] [6]

Peatlands are under threat by commercial peat harvesting, drainage and conversion for agriculture (notably palm oil in 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.

A valley mire creates a level ground surface in otherwise dramatic topography. Upper Bigo Bog, Rwenzori Mountains, Uganda. Ruwenzori Upper Bigo Bog.jpg
A valley mire creates a level ground surface in otherwise dramatic topography. Upper Bigo Bog, Rwenzori Mountains, Uganda.

Types

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., 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. [1]

There are two types of mire: bog and fen. [2] A bog is a mire that, due to its raised location relative to the surrounding landscape, obtains all its water solely from precipitation (ombrotrophic). [7] A fen 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. [8] 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 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. [9]

Some swamps can also be peatlands (e.g.: peat swamp forest), while marshes are generally not considered to be peatlands. [2] Swamps are characterized by their forest canopy or 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.

Global distribution

PEATMAP showing the global distribution of peatlands PEATMAP.jpg
PEATMAP showing the global distribution of peatlands

Peatlands are found around the globe, although are at their greatest extent at high latitudes in the Northern Hemisphere. Peatlands are estimated to cover around 3% of the globe's surface, [10] although estimating the extent of their cover worldwide is difficult due to the varying accuracy and methodologies of land surveys from many countries. [2] 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. [11] 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 is found in the temperate, boreal and subarctic zones of the Northern Hemisphere. [12] 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 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 is known to occur in coastal mangroves as well as in areas of high altitude. [3] Tropical mires largely form where high precipitation is combined with poor conditions for drainage. [2] 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. [12] In the early 21st century, the world's largest tropical mire was found in the Central Congo Basin, covering 145,500 km2 and storing up to 1013 kg of carbon. [13]

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 km2 has been lost. [14] [ clarification needed ] Some of the largest losses have been in Russia, Finland, the Netherlands, the United Kingdom, Poland and Belarus. A catalog of the peat research collection at the University of Minnesota Duluth provides references to research on worldwide peat and peatlands. [15]

Biochemical processes

The carbon cycle within peatlands Carbon Cycle in Peatlands.pdf
The carbon cycle within 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 Ca2+ 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 the inflow of groundwater (bringing in supplementary cations) is high. [16]

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. [17] Peat-forming vegetation is typically also recalcitrant (poorly decomposing) due to high lignin and low nutrient content. [18] Topographically, accumulating peat elevates the ground surface above the original topography. Mires can reach considerable heights above the underlying mineral soil or bedrock: peat depths of above 10m 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. [7] When the absolute decay rate of peat in the catotelm (the lower, water-saturated zone of the peat layer) matches the rate of input of new peat into the catotelm, the mire will stop growing in height. [8]

Carbon storage and methanogenesis

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. [3] Peatlands interact with the atmosphere primarily through the exchange of carbon dioxide, methane and nitrous oxide, [1] and can be damaged by excess nitrogen from agriculture or rainwater. [19] 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. [2] In their natural state, mires are 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. [20] Due to the continued CO2 sequestration over millennia, and because of the longer atmospheric lifespan of the CO2 molecules compared with methane and nitrous oxide, peatlands have had a net cooling effect on the atmosphere. [21]

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 CO2 release via respiration. Carbon dioxide release increases when the water table falls lower, such as during a drought, as this increases the availability of oxygen to the aerobic microbes thus accelerating peat decomposition. [22] 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 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. [23]

Peatlands are important for studying past climate because they are sensitive to changes in the environment and can reveal levels of isotopes, pollutants, macrofossils, metals from the atmosphere, and pollen. [24] 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. [25]

Humic substances

Peat contains 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. [26] Upon extreme drying, 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. [27] [ clarification needed ] The loads of organic matter in the form of humic acid is a source of precursors of coal.[ clarification needed ] Prematurely exposing the organic matter to the atmosphere promotes the conversion of organics to carbon dioxide to be released in the atmosphere.

Use by humans

Extraction of peat from derelict blanket bog, South Uist, Scotland. This old bog is no longer forming peat because the vegetation has been changed, and therefore it is not a mire. Peat cuttings near Unasary - geograph.org.uk - 176303.jpg
Extraction of peat from derelict blanket bog, South Uist, Scotland. This old bog is no longer forming peat because the vegetation has been changed, and therefore it is not a mire.

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. [3]

Peatlands are used by humans in modern times for a range of purposes, the most dominant being agriculture and forestry, which accounts for around a quarter of global peatland area. [3] 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. [1] Agricultural uses for mires include the use of natural vegetation for hay crop or grazing, or the cultivation of crops on a modified surface. [2] In addition, the commercial extraction of peat for energy production is widely practiced in Northern European countries, such as Russia, Sweden, Finland, Ireland and the Baltic states. [3]

Tropical peatlands comprise 0.25% of Earth's terrestrial land surface but store 3% of all soil and forest carbon stocks. [28] 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 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. [12] This releases stored carbon dioxide and preventing the system from sequestering carbon again.

Tropical peatlands

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 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. [2] 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 is therefore vulnerable to changes in hydrology or vegetation cover. [29] 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. [2] Drainage of tropical peatlands alters the hydrology and increases their susceptibility to fire and soil erosion, as a consequence of changes in physical and chemical compositions. [30] 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. [2]

Biology and peat characteristics

Tropical peatland vegetation varies with climate and location. Three different characterizations are mangrove woodlands present in 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. [2] The diversity of woody species, like trees and shrubs, are far greater in tropical peatlands than in peatlands of other types. Peat in 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. [2] It's only partly decomposed and the surface consists of a thick layer of leaf litter. [2] Forestry in peatlands leads to drainage and rapid carbon losses since it decreases inputs of organic matter and accelerate the decomposition. [31] 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. [30] [32]

Greenhouse gases and fires

Satellite image of burning tropical peat swamp, Borneo. In 1997 alone, 73000 ha of swamp was burned in Borneo, releasing the same amount of carbon as 13-40% of the mean annual global carbon emissions of fossil fuels. The majority of this carbon was released from peat rather than overlying tropical rainforest. Borneo fires and smoke, 2002.jpg
Satellite image of burning tropical peat swamp, Borneo. In 1997 alone, 73000 ha of swamp was burned in Borneo, releasing the same amount of carbon as 13-40% of the mean annual global carbon emissions of fossil fuels. The majority of this carbon was released from peat rather than overlying tropical rainforest.

The tropical peatlands in Southeast Asia only cover 0.2% of earths land area but CO2 emissions are estimated to be 2 Gt per year, equal to 7% of global fossil fuel emissions. [29] These emissions get bigger with drainage and burning of peatlands and a severe fire can release up to 4000 t of CO2/ha. Burning events in tropical peatlands are becoming more frequent due to large scale drainage and land clearance and in the past 10 years, more than 2 million ha was burnt in Southeast Asia alone. These fires last typically for 1–3 months and release large amounts of CO2.

Indonesia is one of the countries suffering from peatland fires, especially during years with ENSO-related drought, an increasing problem since 1982 as a result of developing land use and agriculture. [30] During the El Niño-event in 1997-1998 more than 24,400 km2 [2] of peatland was lost to fires in Indonesia alone from which 10,000 km2 was burnt in Kalimantan and Sumatra. The output of CO2 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 3rd biggest contributor to global CO2 emissions, caused primarily by these fires. [33] With 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. [34] Drought and acidification of the lands led to bad harvest and the project was abandoned in 1999. [35] Similar projects in China have led to immense loss of tropical marshes and fens due to rice production. [36]

Drainage, which also increases the risk of burning, can cause additional emissions of CO2 by 30–100 t/ha/year if the water table is lowered by only 1 m. [37] The draining of peatlands is likely the most important and long-lasting threat to peatlands globally, but is especially prevalent in the tropics. [30]

Peatlands release the greenhouse gas methane which has strong global warming potential. However, subtropical wetlands have shown high CO2 binding per mol of released methane, which is a function that counteracts global warming. [38] Tropical peatlands are suggested to contain about 100 Gt carbon, [39] [30] corresponding to more than 50% of the carbon present as CO2 in the atmosphere. [2] Accumulation rates of carbon during the last millennium were close to 40 g C/m2/yr. [40]

Northern peatlands

Wooded bog in Lahemaa National Park, Estonia. 65% of mires in Estonia have been strongly affected or damaged by human activity in recent years. EE-Lahemaa-Bagno Viru.jpg
Wooded bog in Lahemaa National Park, Estonia. 65% of mires in Estonia have been strongly affected or damaged by human activity in recent years.

Northern peatlands are associated with boreal and subarctic climates. [42] 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. [43]

Of all northern circumpolar countries, Russia has the largest area of peatlands [44] and contains the largest peatland in the world, The Great Vasyugan Mire. [45] Nakaikemi Wetland in southwest Honshu, Japan is more than 50,000 years old and has a depth of 45 m. [46] The Philippi Peatland in Greece has probably one of the deepest peat layers with a depth of 190m. [47]

Impacts on global climate

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. [48]

Wetlands provide an environment where organic carbon 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. [49]

Wetlands make up about 5-8% of Earth's terrestrial land surface but contain about 20-30% of the planet's 2500 Gt soil carbon stores. [50] Peatlands contain the highest amounts of soil organic carbon of all wetland types. [51] Wetlands can become sources of carbon, rather than sinks, as the decomposition occurring within the ecosystem emits methane. [49] 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 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 is oxidised quickly and removed from the atmosphere whereas atmospheric carbon dioxide is continuously absorbed. [52] 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 20-30 grams of carbon per square meter per year. [1] [53]

Peatlands insulate the permafrost in subarctic regions, thus delaying thawing during summer, as well as inducing the formation of permafrost. [52] As the global climate continues to warm, wetlands could become major carbon sources as higher temperatures cause higher carbon dioxide emissions. [54]

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 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. [49]

Drainage for agriculture and forestry

The exchange of carbon between the peatlands and the atmosphere has been of current concern globally in the field of ecology and biogeochemical studies. [2] 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 the subsequent oxidative degradation results in the release of carbon into the atmosphere. [55] As such, drainage of mires for agriculture transforms them from net carbon sinks to net carbon emitters. [1] Although the emission of methane from mires has been observed to decrease following drainage, [20] 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. [56] [57]

When undertaken in such 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. [3]

Palm oil plantations

Palm oil plantation in Kunak, Malaysia. Peatlands in South East Asia are being converted to palm oil plantation, releasing as much as 76.6 tonnes of CO2 per hectare. Kunak-District Sabah Oil-palm-plantation-01.jpg
Palm oil plantation in Kunak, Malaysia. Peatlands in South East Asia are being converted to palm oil plantation, releasing as much as 76.6 tonnes of CO2 per hectare.

Palm oil has increasingly become one of 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. [58] 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, the land selected for plantations are typically substantial carbon stores that promote biodiverse ecosystems. [59]

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. [60] In their natural state, peatlands are waterlogged with high water tables making for an inefficient soil.[ clarification needed ] [58] To create viable soil for plantation, 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. [60] 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 is estimated to be between the equivalent of 12.4 (best case) to 76.6 t CO2/ha (worst case). [58] Tropical peatland converted to palm oil plantation can remain a net source of carbon to the atmosphere after 12 years. [61]

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 the air. These fires add to greenhouse gas emissions while also causing thousands of deaths every year.[ citation needed ]

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.

Satellite image of peat fire in Yekaterinburg, Russia, in 2021 Unseasonal peat fire in Russia (Copernicus).jpg
Satellite image of peat fire in Yekaterinburg, Russia, in 2021

Fires

Some peatlands are being dried out by climate change. [62] Drainage of peatlands due to climatic factors may also increase the risk of fires, presenting further risk of carbon and methane to release into the atmosphere. [3] 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 the surface causing incomplete combustion of the organic matter and resulting in extreme emissions events. [3]

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. [1] This resulting loss of biomass through combustion has led to significant emissions of greenhouse gasses both in tropical and boreal/temperate peatlands. [63] Fire events are predicted to become more frequent with the warming and drying of the global climate. [2]

Management and rehabilitation

The United Nations Convention of 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. [3]

Often, restoration is done by blocking drainage channels in the peatland, and allowing natural vegetation to recover. [64] 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. [3] UNEP is supporting peatland restoration in Indonesia. [65]

Global Peatlands Initiative

This section is an excerpt from Global Peatlands Initiative.[ edit ]

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. [66] 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.

Members of the Initiative are working together within their respective areas of expertise to improve the conservation, restoration and sustainable management of peatlands. The Initiative is therefore contributing to several Sustainable Development Goals (SDGs), by keeping carbon stocks in the ground (SDG 13), by avoiding health impacts associated with serious air pollution from burning drained peatlands (SDG 3), by protecting water-related ecosystems and facilitating improved water quality (SDG 6), and by ensuring conservation of ecosystems and threatened species, protecting life on land (SDG 15). [67]

Related Research Articles

<span class="mw-page-title-main">Carbon sink</span> Reservoir absorbing more carbon from, than emitting to, the air

A carbon sink is anything, natural or otherwise, that accumulates and stores some carbon-containing chemical compound for an indefinite period and thereby removes carbon dioxide from the atmosphere. These sinks form an important part of the natural carbon cycle. An overarching term is carbon pool, which is all the places where carbon can be. A carbon sink is a type of carbon pool that has the capability to take up more carbon from the atmosphere than it releases.

<span class="mw-page-title-main">Peat</span> Accumulation of partially decayed vegetation

Peat is an accumulation of partially decayed vegetation or organic matter. It is unique to natural areas called peatlands, bogs, mires, moors, or muskegs. Sphagnum moss, also called peat moss, is one of the most common components in peat, although many other plants can contribute. The biological features of sphagnum mosses act to create a habitat aiding peat formation, a phenomenon termed 'habitat manipulation'. Soils consisting primarily of peat are known as histosols. Peat forms in wetland conditions, where flooding or stagnant water obstructs the flow of oxygen from the atmosphere, slowing the rate of decomposition. Peat properties such as organic matter content and saturated hydraulic conductivity can exhibit high spatial heterogeneity.

<span class="mw-page-title-main">Wetland</span> Land area that is permanently, or seasonally saturated with water

A wetland is a distinct ecosystem that is flooded or saturated by water, either permanently for years or decades or seasonally for a shorter periods. Flooding results in oxygen-free anoxic processes prevailing, especially in the soils. The primary factor that distinguishes wetlands from terrestrial land forms or water bodies is the characteristic vegetation of aquatic plants, adapted to the unique anoxic hydric soils. Wetlands are considered among the most biologically diverse of all ecosystems, serving as home to a wide range of plant and animal species. Methods for assessing wetland functions, wetland ecological health, and general wetland condition have been developed for many regions of the world. These methods have contributed to wetland conservation partly by raising public awareness of the functions some wetlands provide. Constructed wetlands are designed and built to treat municipal and industrial wastewater as well as to divert stormwater runoff. Constructed wetlands may also play a role in water-sensitive urban design.

<span class="mw-page-title-main">Fen</span> Type of wetland fed by mineral-rich ground or surface water

A fen is a type of peat-accumulating wetland fed by mineral-rich ground or surface water. It is one of the main types of wetlands along with marshes, swamps, and bogs. Bogs and fens, both peat-forming ecosystems, are also known as mires. The unique water chemistry of fens is a result of the ground or surface water input. Typically, this input results in higher mineral concentrations and a more basic pH than found in bogs. As peat accumulates in a fen, groundwater input can be reduced or cut off, making the fen ombrotrophic rather than minerotrophic. In this way, fens can become more acidic and transition to bogs over time.

<span class="mw-page-title-main">Bog</span> Type of wetland with peat-rich soil

A bog or bogland 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 the sphagnum moss and peat. The gradual accumulation of decayed plant material in a bog functions as a carbon sink.

<span class="mw-page-title-main">Climate change mitigation</span> Actions to reduce net greenhouse gas emissions to limit climate change

Climate change mitigation is action to limit climate change. This action either reduces emissions of greenhouse gases or removes those gases from the atmosphere. The recent rise in global temperature is mostly due to emissions from burning fossil fuels such as coal, oil, and natural gas. There are various ways that mitigation can reduce emissions. These are transitioning to sustainable energy sources, conserving energy, and increasing efficiency. It is possible to remove carbon dioxide from the atmosphere. This can be done by enlarging forests, restoring wetlands and using other natural and technical processes. The name for these processes is carbon sequestration. Governments and companies have pledged to reduce emissions to prevent dangerous climate change. These pledges are in line with international negotiations to limit warming.

<span class="mw-page-title-main">Peat swamp forest</span> Tropical moist forests where waterlogged soil prevents dead leaves and wood from fully decomposing

Peat swamp forests are tropical moist forests where waterlogged soil prevents dead leaves and wood from fully decomposing. Over time, this creates a thick layer of acidic peat. Large areas of these forests are being logged at high rates.

<span class="mw-page-title-main">Carbon sequestration</span> Storing carbon in a carbon pool (natural as well as enhanced or artificial processes)

Carbon sequestration is the process of storing carbon in a carbon pool. Carbon sequestration is a naturally occurring process but it can also be enhanced or achieved with technology, for example within carbon capture and storage projects. There are two main types of carbon sequestration: geologic and biologic.

<span class="mw-page-title-main">Tropical peat</span>

Tropical peat is a type of histosol that is found in tropical latitudes, including South East Asia, Africa, and Central and South America. Tropical peat mostly consists of dead organic matter from trees instead of spaghnum which are commonly found in temperate peat. This soils usually contain high organic matter content, exceeding 75% with dry low bulk density around 0.2 mg/m3 (0.0 gr/cu ft).

<span class="mw-page-title-main">Arctic methane emissions</span> Release of methane from seas and soils in permafrost regions of the Arctic

Arctic methane release is the release of methane from Arctic ocean waters as well as from soils in permafrost regions of the Arctic. While it is a long-term natural process, methane release is exacerbated by global warming. This results in a positive climate change feedback, as methane is a powerful greenhouse gas. The Arctic region is one of many natural sources of methane. Climate change could accelerate methane release in the Arctic, due to the release of methane from existing stores, and from methanogenesis in rotting biomass. When permafrost thaws as a consequence of warming, large amounts of organic material can become available for methanogenesis and may ultimately be released as methane.

<span class="mw-page-title-main">Atmospheric methane</span> Methane in Earths atmosphere

Atmospheric methane is the methane present in Earth's atmosphere. The concentration of atmospheric methane is increasing due to methane emissions, and is causing climate change. Methane is one of the most potent greenhouse gases. Methane's radiative forcing (RF) of climate is direct, and it is the second largest contributor to human-caused climate forcing in the historical period. Methane is a major source of water vapour in the stratosphere through oxidation; and water vapour adds about 15% to methane's radiative forcing effect. The global warming potential (GWP) for methane is about 84 in terms of its impact over a 20-year timeframe. and 28 in terms of its impact over a 100-year timeframe.

<span class="mw-page-title-main">Climate change feedbacks</span> Feedback related to climate change

Climate change feedbacks are effects of global warming that amplify or diminish the effect of forces that initially cause the warming. Positive feedbacks enhance global warming while negative feedbacks weaken it. Feedbacks are important in the understanding of climate change because they play an important part in determining the sensitivity of the climate to warming forces. Climate forcings and feedbacks together determine how much and how fast the climate changes. Large positive feedbacks can lead to tipping points—abrupt or irreversible changes in the climate system—depending upon the rate and magnitude of the climate change.

<span class="mw-page-title-main">Permafrost carbon cycle</span> Sub-cycle of the larger global carbon cycle

The permafrost carbon cycle or Arctic carbon cycle is a sub-cycle of the larger global carbon cycle. Permafrost is defined as subsurface material that remains below 0o C for at least two consecutive years. Because permafrost soils remain frozen for long periods of time, they store large amounts of carbon and other nutrients within their frozen framework during that time. Permafrost represents a large carbon reservoir, one which was often neglected in the initial research determining global terrestrial carbon reservoirs. Since the start of the 2000s, however, far more attention has been paid to the subject, with an enormous growth both in general attention and in the scientific research output.

<span class="mw-page-title-main">Greenhouse gas emissions from wetlands</span> Source of gas emissions

Greenhouse gas emissions from wetlands of concern consist primarily of methane and nitrous oxide emissions. Wetlands are the largest natural source of atmospheric methane in the world, and are therefore a major area of concern with respect to climate change. Wetlands account for approximately 20 - 30% of atmospheric methane through emissions from soils and plants, and contribute an approximate average of 161 Tg of methane to the atmosphere per year.

The atmospheric carbon cycle accounts for the exchange of gaseous carbon compounds, primarily carbon dioxide, between Earth's atmosphere, the oceans, and the terrestrial biosphere. It is one of the faster components of the planet's overall carbon cycle, supporting the exchange of more than 200 billion tons of carbon in and out of the atmosphere throughout the course of each year. Atmospheric concentrations of CO2 remain stable over longer timescales only when there exists a balance between these two flows. Methane, Carbon monoxide (CO), and other man-made compounds are present in smaller concentrations and are also part of the atmospheric carbon cycle.

<span class="mw-page-title-main">Climate-friendly gardening</span> Low greenhouse gases gardening

Climate-friendly gardening is a form of gardening that can reduce emissions of greenhouse gases from gardens and encourage the absorption of carbon dioxide by soils and plants in order to aid the reduction of global warming. To be a climate-friendly gardener means considering both what happens in a garden and the materials brought into it as well as the impact they have on land use and climate. It can also include garden features or activities in the garden that help to reduce greenhouse gas emissions through processes not directly related to gardening.

Increasing methane emissions are a major contributor to the rising concentration of greenhouse gases in Earth's atmosphere, and are responsible for up to one-third of near-term global heating. During 2019, about 60% of methane released globally was from human activities, while natural sources contributed about 40%. Reducing methane emissions by capturing and utilizing the gas can produce simultaneous environmental and economic benefits.

Paludiculture is wet agriculture and forestry on peatlands. Paludiculture combines the reduction of greenhouse gas emissions from drained peatlands through rewetting with continued land use and biomass production under wet conditions. “Paludi” comes from the Latin “palus” meaning “swamp, morass” and "paludiculture" as a concept was developed at Greifswald University. Paludiculture is a sustainable alternative to drainage-based agriculture, intended to maintain carbon storage in peatlands. This differentiates paludiculture from agriculture like rice paddies, which involve draining, and therefore degrading wetlands.

Jill L. Bubier is a professor emerita of environmental science at Mount Holyoke College (MHC). Her research examines how Northern ecosystems respond to climate change.

<span class="mw-page-title-main">Peatland restoration</span> Peatland restoration

Peatland restoration is a term describing measures to restore the original form and function of peatlands, or wet peat-rich areas. This landscape globally occupies 400 million hectares or 3% of land surface on Earth. Historically, peatlands have been drained for several main reasons; peat extraction, creation of agricultural land, and forestry usage. However, this activity has caused degradation affecting this landscape's structure through damage to habitats, hydrology, nutrients cycle, carbon balance and more.

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