Divergent changes in particulate and mineral-associated organic carbon upon permafrost thaw

被引：0
作者：
Futing Liu
Shuqi Qin
Kai Fang
Leiyi Chen
Yunfeng Peng
Pete Smith
Yuanhe Yang
机构：
[1] Chinese Academy of Forestry,Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration, Ecology and Nature Conservation Institute
[2] Chinese Academy of Sciences,State Key Laboratory of Vegetation and Environmental Change, Institute of Botany
[3] University of Chinese Academy of Sciences,Institute of Biological and Environmental Sciences
[4] University of Aberdeen,undefined
来源：
Nature Communications | / 13卷
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摘要：
Permafrost thaw can stimulate microbial decomposition and induce soil carbon (C) loss, potentially triggering a positive C-climate feedback. However, earlier observations have concentrated on bulk soil C dynamics upon permafrost thaw, with limited evidence involving soil C fractions. Here, we explore how the functionally distinct fractions, including particulate and mineral-associated organic C (POC and MAOC) as well as iron-bound organic C (OC-Fe), respond to permafrost thaw using systematic measurements derived from one permafrost thaw sequence and five additional thermokarst-impacted sites on the Tibetan Plateau. We find that topsoil POC content substantially decreases, while MAOC content remains stable and OC-Fe accumulates due to the enriched Fe oxides after permafrost thaw. Moreover, the proportion of MAOC and OC-Fe increases along the thaw sequence and at most of the thermokarst-impacted sites. The relatively enriched stable soil C fractions would alleviate microbial decomposition and weaken its feedback to climate warming over long-term thermokarst development.
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