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Hydroclimatic vulnerability of peat carbon in the central Congo Basin
The forested swamps of the central Congo Basin store approximately 30 billion metric tonnes of carbon in peat(1,2). Little is known about the vulnerability of these carbon stocks. Here we investigate this vulnerability using peat cores from a large interfluvial basin in the Republic of the Congo and...
Autores principales: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9729114/ https://www.ncbi.nlm.nih.gov/pubmed/36323786 http://dx.doi.org/10.1038/s41586-022-05389-3 |
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author | Garcin, Yannick Schefuß, Enno Dargie, Greta C. Hawthorne, Donna Lawson, Ian T. Sebag, David Biddulph, George E. Crezee, Bart Bocko, Yannick E. Ifo, Suspense A. Mampouya Wenina, Y. Emmanuel Mbemba, Mackline Ewango, Corneille E. N. Emba, Ovide Bola, Pierre Kanyama Tabu, Joseph Tyrrell, Genevieve Young, Dylan M. Gassier, Ghislain Girkin, Nicholas T. Vane, Christopher H. Adatte, Thierry Baird, Andy J. Boom, Arnoud Gulliver, Pauline Morris, Paul J. Page, Susan E. Sjögersten, Sofie Lewis, Simon L. |
author_facet | Garcin, Yannick Schefuß, Enno Dargie, Greta C. Hawthorne, Donna Lawson, Ian T. Sebag, David Biddulph, George E. Crezee, Bart Bocko, Yannick E. Ifo, Suspense A. Mampouya Wenina, Y. Emmanuel Mbemba, Mackline Ewango, Corneille E. N. Emba, Ovide Bola, Pierre Kanyama Tabu, Joseph Tyrrell, Genevieve Young, Dylan M. Gassier, Ghislain Girkin, Nicholas T. Vane, Christopher H. Adatte, Thierry Baird, Andy J. Boom, Arnoud Gulliver, Pauline Morris, Paul J. Page, Susan E. Sjögersten, Sofie Lewis, Simon L. |
author_sort | Garcin, Yannick |
collection | PubMed |
description | The forested swamps of the central Congo Basin store approximately 30 billion metric tonnes of carbon in peat(1,2). Little is known about the vulnerability of these carbon stocks. Here we investigate this vulnerability using peat cores from a large interfluvial basin in the Republic of the Congo and palaeoenvironmental methods. We find that peat accumulation began at least at 17,500 calibrated years before present (cal. yr bp; taken as ad 1950). Our data show that the peat that accumulated between around 7,500 to around 2,000 cal. yr bp is much more decomposed compared with older and younger peat. Hydrogen isotopes of plant waxes indicate a drying trend, starting at approximately 5,000 cal. yr bp and culminating at approximately 2,000 cal. yr bp, coeval with a decline in dominant swamp forest taxa. The data imply that the drying climate probably resulted in a regional drop in the water table, which triggered peat decomposition, including the loss of peat carbon accumulated prior to the onset of the drier conditions. After approximately 2,000 cal. yr bp, our data show that the drying trend ceased, hydrologic conditions stabilized and peat accumulation resumed. This reversible accumulation–loss–accumulation pattern is consistent with other peat cores across the region, indicating that the carbon stocks of the central Congo peatlands may lie close to a climatically driven drought threshold. Further research should quantify the combination of peatland threshold behaviour and droughts driven by anthropogenic carbon emissions that may trigger this positive carbon cycle feedback in the Earth system. |
format | Online Article Text |
id | pubmed-9729114 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-97291142022-12-09 Hydroclimatic vulnerability of peat carbon in the central Congo Basin Garcin, Yannick Schefuß, Enno Dargie, Greta C. Hawthorne, Donna Lawson, Ian T. Sebag, David Biddulph, George E. Crezee, Bart Bocko, Yannick E. Ifo, Suspense A. Mampouya Wenina, Y. Emmanuel Mbemba, Mackline Ewango, Corneille E. N. Emba, Ovide Bola, Pierre Kanyama Tabu, Joseph Tyrrell, Genevieve Young, Dylan M. Gassier, Ghislain Girkin, Nicholas T. Vane, Christopher H. Adatte, Thierry Baird, Andy J. Boom, Arnoud Gulliver, Pauline Morris, Paul J. Page, Susan E. Sjögersten, Sofie Lewis, Simon L. Nature Article The forested swamps of the central Congo Basin store approximately 30 billion metric tonnes of carbon in peat(1,2). Little is known about the vulnerability of these carbon stocks. Here we investigate this vulnerability using peat cores from a large interfluvial basin in the Republic of the Congo and palaeoenvironmental methods. We find that peat accumulation began at least at 17,500 calibrated years before present (cal. yr bp; taken as ad 1950). Our data show that the peat that accumulated between around 7,500 to around 2,000 cal. yr bp is much more decomposed compared with older and younger peat. Hydrogen isotopes of plant waxes indicate a drying trend, starting at approximately 5,000 cal. yr bp and culminating at approximately 2,000 cal. yr bp, coeval with a decline in dominant swamp forest taxa. The data imply that the drying climate probably resulted in a regional drop in the water table, which triggered peat decomposition, including the loss of peat carbon accumulated prior to the onset of the drier conditions. After approximately 2,000 cal. yr bp, our data show that the drying trend ceased, hydrologic conditions stabilized and peat accumulation resumed. This reversible accumulation–loss–accumulation pattern is consistent with other peat cores across the region, indicating that the carbon stocks of the central Congo peatlands may lie close to a climatically driven drought threshold. Further research should quantify the combination of peatland threshold behaviour and droughts driven by anthropogenic carbon emissions that may trigger this positive carbon cycle feedback in the Earth system. Nature Publishing Group UK 2022-11-02 2022 /pmc/articles/PMC9729114/ /pubmed/36323786 http://dx.doi.org/10.1038/s41586-022-05389-3 Text en © The Author(s), under exclusive licence to Springer Nature Limited 2022, corrected publication 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . |
spellingShingle | Article Garcin, Yannick Schefuß, Enno Dargie, Greta C. Hawthorne, Donna Lawson, Ian T. Sebag, David Biddulph, George E. Crezee, Bart Bocko, Yannick E. Ifo, Suspense A. Mampouya Wenina, Y. Emmanuel Mbemba, Mackline Ewango, Corneille E. N. Emba, Ovide Bola, Pierre Kanyama Tabu, Joseph Tyrrell, Genevieve Young, Dylan M. Gassier, Ghislain Girkin, Nicholas T. Vane, Christopher H. Adatte, Thierry Baird, Andy J. Boom, Arnoud Gulliver, Pauline Morris, Paul J. Page, Susan E. Sjögersten, Sofie Lewis, Simon L. Hydroclimatic vulnerability of peat carbon in the central Congo Basin |
title | Hydroclimatic vulnerability of peat carbon in the central Congo Basin |
title_full | Hydroclimatic vulnerability of peat carbon in the central Congo Basin |
title_fullStr | Hydroclimatic vulnerability of peat carbon in the central Congo Basin |
title_full_unstemmed | Hydroclimatic vulnerability of peat carbon in the central Congo Basin |
title_short | Hydroclimatic vulnerability of peat carbon in the central Congo Basin |
title_sort | hydroclimatic vulnerability of peat carbon in the central congo basin |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9729114/ https://www.ncbi.nlm.nih.gov/pubmed/36323786 http://dx.doi.org/10.1038/s41586-022-05389-3 |
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