Soil organic carbon pools and stocks in permafrost-affected soils on the tibetan plateau.
The Tibetan Plateau reacts particularly sensitively to possible effects of climate change. Approximately two thirds of the total area is affected by permafrost. To get a better understanding of the role of permafrost on soil organic carbon pools and stocks, investigations were carried out including...
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ftdoajarticles:oai:doaj.org/article:20cf36c05cc8459f96abf628e93df421 2023-05-15T13:02:59+02:00 Soil organic carbon pools and stocks in permafrost-affected soils on the tibetan plateau. Corina Dörfer Peter Kühn Frank Baumann Jin-Sheng He Thomas Scholten 2013-01-01T00:00:00Z https://doi.org/10.1371/journal.pone.0057024 https://doaj.org/article/20cf36c05cc8459f96abf628e93df421 EN eng Public Library of Science (PLoS) http://europepmc.org/articles/PMC3582616?pdf=render https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0057024 https://doaj.org/article/20cf36c05cc8459f96abf628e93df421 PLoS ONE, Vol 8, Iss 2, p e57024 (2013) Medicine R Science Q article 2013 ftdoajarticles https://doi.org/10.1371/journal.pone.0057024 2022-12-31T11:02:17Z The Tibetan Plateau reacts particularly sensitively to possible effects of climate change. Approximately two thirds of the total area is affected by permafrost. To get a better understanding of the role of permafrost on soil organic carbon pools and stocks, investigations were carried out including both discontinuous (site Huashixia, HUA) and continuous permafrost (site Wudaoliang, WUD). Three organic carbon fractions were isolated using density separation combined with ultrasonic dispersion: the light fractions (<1.6 g cm(-3)) of free particulate organic matter (FPOM) and occluded particulate organic matter (OPOM), plus a heavy fraction (>1.6 g cm(-3)) of mineral associated organic matter (MOM). The fractions were analyzed for C, N, and their portion of organic C. FPOM contained an average SOC content of 252 g kg(-1). Higher SOC contents (320 g kg(-1)) were found in OPOM while MOM had the lowest SOC contents (29 g kg(-1)). Due to their lower density the easily decomposable fractions FPOM and OPOM contribute 27% (HUA) and 22% (WUD) to the total SOC stocks. In HUA mean SOC stocks (0-30 cm depth) account for 10.4 kg m(-2), compared to 3.4 kg m(-2) in WUD. 53% of the SOC is stored in the upper 10 cm in WUD, in HUA only 39%. Highest POM values of 36% occurred in profiles with high soil moisture content. SOC stocks, soil moisture and active layer thickness correlated strongly in discontinuous permafrost while no correlation between SOC stocks and active layer thickness and only a weak relation between soil moisture and SOC stocks could be found in continuous permafrost. Consequently, permafrost-affected soils in discontinuous permafrost environments are susceptible to soil moisture changes due to alterations in quantity and seasonal distribution of precipitation, increasing temperature and therefore evaporation. Article in Journal/Newspaper Active layer thickness permafrost Directory of Open Access Journals: DOAJ Articles PLoS ONE 8 2 e57024 |
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Medicine R Science Q |
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Medicine R Science Q Corina Dörfer Peter Kühn Frank Baumann Jin-Sheng He Thomas Scholten Soil organic carbon pools and stocks in permafrost-affected soils on the tibetan plateau. |
topic_facet |
Medicine R Science Q |
description |
The Tibetan Plateau reacts particularly sensitively to possible effects of climate change. Approximately two thirds of the total area is affected by permafrost. To get a better understanding of the role of permafrost on soil organic carbon pools and stocks, investigations were carried out including both discontinuous (site Huashixia, HUA) and continuous permafrost (site Wudaoliang, WUD). Three organic carbon fractions were isolated using density separation combined with ultrasonic dispersion: the light fractions (<1.6 g cm(-3)) of free particulate organic matter (FPOM) and occluded particulate organic matter (OPOM), plus a heavy fraction (>1.6 g cm(-3)) of mineral associated organic matter (MOM). The fractions were analyzed for C, N, and their portion of organic C. FPOM contained an average SOC content of 252 g kg(-1). Higher SOC contents (320 g kg(-1)) were found in OPOM while MOM had the lowest SOC contents (29 g kg(-1)). Due to their lower density the easily decomposable fractions FPOM and OPOM contribute 27% (HUA) and 22% (WUD) to the total SOC stocks. In HUA mean SOC stocks (0-30 cm depth) account for 10.4 kg m(-2), compared to 3.4 kg m(-2) in WUD. 53% of the SOC is stored in the upper 10 cm in WUD, in HUA only 39%. Highest POM values of 36% occurred in profiles with high soil moisture content. SOC stocks, soil moisture and active layer thickness correlated strongly in discontinuous permafrost while no correlation between SOC stocks and active layer thickness and only a weak relation between soil moisture and SOC stocks could be found in continuous permafrost. Consequently, permafrost-affected soils in discontinuous permafrost environments are susceptible to soil moisture changes due to alterations in quantity and seasonal distribution of precipitation, increasing temperature and therefore evaporation. |
format |
Article in Journal/Newspaper |
author |
Corina Dörfer Peter Kühn Frank Baumann Jin-Sheng He Thomas Scholten |
author_facet |
Corina Dörfer Peter Kühn Frank Baumann Jin-Sheng He Thomas Scholten |
author_sort |
Corina Dörfer |
title |
Soil organic carbon pools and stocks in permafrost-affected soils on the tibetan plateau. |
title_short |
Soil organic carbon pools and stocks in permafrost-affected soils on the tibetan plateau. |
title_full |
Soil organic carbon pools and stocks in permafrost-affected soils on the tibetan plateau. |
title_fullStr |
Soil organic carbon pools and stocks in permafrost-affected soils on the tibetan plateau. |
title_full_unstemmed |
Soil organic carbon pools and stocks in permafrost-affected soils on the tibetan plateau. |
title_sort |
soil organic carbon pools and stocks in permafrost-affected soils on the tibetan plateau. |
publisher |
Public Library of Science (PLoS) |
publishDate |
2013 |
url |
https://doi.org/10.1371/journal.pone.0057024 https://doaj.org/article/20cf36c05cc8459f96abf628e93df421 |
genre |
Active layer thickness permafrost |
genre_facet |
Active layer thickness permafrost |
op_source |
PLoS ONE, Vol 8, Iss 2, p e57024 (2013) |
op_relation |
http://europepmc.org/articles/PMC3582616?pdf=render https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0057024 https://doaj.org/article/20cf36c05cc8459f96abf628e93df421 |
op_doi |
https://doi.org/10.1371/journal.pone.0057024 |
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PLoS ONE |
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8 |
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e57024 |
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