World World's largest peatland with vast carbon-storage capacity found in Congo

22:40  11 january  2017
22:40  11 january  2017 Source:   The Guardian

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Carbon -rich peatlands in remote Congo basin could store three years’ worth of world ’ s fossil fuel emissions, say scientists.

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The new study found that the central Congo peatlands cover 145,500 square kilometres – an area larger than England. © Provided by Guardian News The new study found that the central Congo peatlands cover 145,500 square kilometres – an area larger than England. Scientists have discovered the world’s largest tropical peatland in the remote Congo swamps, estimated to store the equivalent of three year’s worth of the world’s total fossil fuel emissions.

Researchers mapped the Cuvette Centrale peatlands in the central Congo basin and found they cover 145,500 sq km – an area larger than England. The swamps could lock in 30bn tonnes of carbon that was previously not known to exist, making the region one of the most carbon-rich ecosystems on Earth.

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The UK-Congolese research team, co-led by Prof Simon Lewis and Dr Greta Dargie, from the University of Leeds and University College London, first discovered the swamps five years ago. Their research, published in Nature on Wednesday, combined three year’s worth of peat analysis with satellite data to estimate that the Congo basin peatlands store the equivalent of nearly 30% of the world’s tropical peatland carbon.

Lewis said: “Our research shows that the peat in the central Congo basin covers a colossal amount of land. It is 16 times larger than the previous estimate and is the single largest peatland complex found anywhere in the tropics. 

“We have also found 30bn tonnes of carbon that nobody knew existed. The peat covers only 4% of the whole Congo basin, but stores the same amount of carbon below ground as that stored above ground in the trees covering the other 96%.

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The largest peatland complex in Amazonia. Peatlands in Amazonian Peru are known to store large quantities of carbon , but there is high uncertainty in the spatial extent and total carbon stocks of these ecosystems. Using a multi-sensor (Landsat, ALOS PALSAR and SRTM) remote sensing approach, together with field data including 24 forest census plots and 218 peat thickness measurements it was found that theses A vast peatland has been discovered in a remote part of Congo -Brazzaville covering an area the size of England and is thought to contain billions of tonnes of peat.

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“These peatlands hold nearly 30% of the world’s tropical peatland carbon, that’s about 20 years’ of the fossil fuel emissions of the United States of America.”

Peat is an organic wetland soil made from part-decomposed plant debris, more commonly found in cool environments, such as northern Russia, Europe and Canada. Healthy peatlands act as carbon sinks, removing carbon from the atmosphere through plant growth. Further decomposition of the peat is prevented by its waterlogged environment, locking up carbon. Year-round waterlogging is needed for peat to form in the tropics.

If peatlands dry out, either through changes in land use such as drainage for agriculture or reduced rainfall, further decomposition resumes, releasing carbon dioxide into the atmosphere.

Lewis said: “Peatlands are only a resource in the fight against climate change when are left intact, and so maintaining large stores of carbon in undisturbed peatlands should be a priority. Our new results show that carbon has been building up in the Congo basin’s peat for nearly 11,000 years.

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A vast peatland in the Congo Basin has been mapped for the first time, revealing it to be the largest in the tropics. The new study found that the Cuvette Centrale peatlands in the central Congo Basin, which were unknown to exist five years ago, cover 145,500 square kilometres -- an area larger than England. They lock in 30 billion tonnes of carbon making the region one of the most carbon -rich ecosystems on Earth.

A vast peatland in the Congo Basin has been mapped for the first time, revealing it to be the largest in the tropics. The new study found that the Cuvette Centrale peatlands in the central Congo Basin, which were unknown to exist five years ago, cover 145,500 square kilometres -- an area larger than England. They lock in 30 billion tonnes of carbon making the region one of the most carbon -rich ecosystems on Earth.

“If the Congo basin peatland complex was to be destroyed, this would release billions of tonnes of carbon dioxide into our atmosphere.”

Because of their remote location, the peatlands in the Congo basin are relatively undisturbed, but because they are so newly discovered, they are not protected by conservation plans. They could face threats from drainage for agricultural plantations, particularly for palm oil, as is happening in Indonesia.

The study places the Democratic Republic of Congo (DRC) and the Republic of Congo (RoC) as the second and third most important countries in the world for tropical peat carbon stocks. In first place is Indonesia, that contains tropical peatlands across the islands of Borneo, Sumatra and New Guinea. However, the islands have suffered damage or loss to about 94,000 km2 of peatland over recent decades, primarily due to forest fires or drainage for agricultural use.

The peat may also be vulnerable to the effects of climate change – increased evaporation due to rising temperatures or reduced rainfall could cause it to dry out and begin to release its carbon to the atmosphere.

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Billions of tons of carbon sequestered in the world ' s peat bogs could be released into the atmosphere in the coming decades as a result of global warming, according to a new analysis of the interplay between peat bogs, water University of Alberta researchers have determined that the influence of northern peatlands on the prehistorical record of climate change has been over estimated, but the vast northern wetlands must still be watched closely

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The study’s co-author Dr Ifo Suspense, from the Université Marien Ngouabi in the RoC capital Brazzaville, said: “The discovery of the Cuvette Centrale peatlands could have a large impact on the climate and conservation policies of the Congo. The maintenance and protection of this peatland complex, alongside protecting our forests, could be central Africa’s great contribution to the global climate change problem.

“It is of the utmost importance that governments, conservation and scientific communities work with the people of the Cuvette Centrale to improve local livelihoods without compromising the integrity of this globally significant region of Earth.”

In addition to their status as a globally important region for carbon storage, the Congo basin swamps are refuges for endangered species including lowland gorillas and forest elephants.

Dr Emma Stokes, director of the central Africa program of the Wildlife Conservation Society said: “This research highlights the immense significance of these swamp forests for the stability of our climate. However, these forests, in the geographical heart of Africa, are also a vital refuge for many thousands of great apes, elephants and other large forest mammals that are threatened by developments in the surrounding landscape.

“The RoC government is considering the expansion of Lac Télé community reserve, a move that could safeguard an additional 50,000 sq km of swamp forest – much of it overlying peat – from future disturbance. We strongly support this move and commend the RoC government for this initiative. We urge both countries to continue efforts to protect these habitats from industrial transformation.”

Dargie said: “With so many of the world’s tropical peatlands under threat from land development and the need to reduce carbon emissions to zero over the coming decades, it is essential that the Congo basin peatlands remain intact.”

He added: “The sheer expanse of these peatlands makes central Africa home to the world’s most extensive peatland complex. It is astonishing that in 2016 discoveries like this can still be made.”

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