永久冻土
热岩溶
土壤碳
表土
环境化学
微粒
总有机碳
分解
土壤科学
环境科学
碳纤维
土壤有机质
高原(数学)
有机质
地球科学
地质学
作者
Futing Liu,Shuqi Qin,Kai Fang,Leiyi Chen,Yunfeng Peng,Pete Smith,Yuanhe Yang
标识
DOI:10.1038/s41467-022-32681-7
摘要
Abstract 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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