IMHE OpenIR  > 山地表生过程与生态调控重点实验室
Soil moisture as a key factor in carbon release from thawing permafrost in a boreal forest
Song Xiaoyan1,2; Wang Genxu2; Ran Fei2; Huang Kewei2,3; Sun Juying2,3; Song Chunlin2
Source PublicationGEODERMA
Contribution Rank2
AbstractThe feedback between the atmosphere and permafrost soils containing large carbon stocks is currently considered the most important carbon-cycle feedback but it is missing from climate models due to many uncertainties. Knowledge of how differences in post-thaw hydrological conditions affect carbon (C) release is critical for predicting permafrost feedback but this knowledge remains limited. In this study permafrost and active layer soils from the southern margin of the Eurasian boreal permafrost region in Northeast China were collected and incubated under experimentally modified moisture to monitor their CO2 and CH4 productions under simulated natural drier and flooded conditions. We also characterized soil properties related to soil organic carbon (SOC) quality and microbial activities to determine their relations with measured C productions. We found that permafrost had higher C release per gram of SOC basis (C vulnerability) than the active layer which suggested that there would be a high risk for C emissions in the permafrost region when permafrost thaws in the warming future. However hydrological conditions following the permafrost thaw control these emissions. Permafrost C decomposed in relatively aerobic upland systems had higher C emissions than that decomposed in anaerobic wetland environments. Our results suggest a greater climate forcing of C release in aerobic than anaerobic conditions but there are some uncertainties resulting from the unknown long-term CH4 production rates. Moreover we found that the aerobic C production in permafrost after thawing could be constrained by water stress suggesting that previous predictions based on soil incubations at natural soil moisture might overestimate the aerobic permafrost C release.
KeywordMethane Carbon dioxide Organic carbon Active layer Incubation experiment
Indexed BySCI
WOS IDWOS:000496837300025
Citation statistics
Document Type期刊论文
Corresponding AuthorWang Genxu
Affiliation1.Institute of Qinghai-Tibetan Plateau, Southwest Minzu University, Chengdu 610041, China;
2.Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China;
3.University of Chinese Academy of Sciences, Beijing 100049, China
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Corresponding Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
Song Xiaoyan,Wang Genxu,Ran Fei,et al. Soil moisture as a key factor in carbon release from thawing permafrost in a boreal forest[J]. GEODERMA,2020,357:113975.
APA Song Xiaoyan,Wang Genxu,Ran Fei,Huang Kewei,Sun Juying,&Song Chunlin.(2020).Soil moisture as a key factor in carbon release from thawing permafrost in a boreal forest.GEODERMA,357,113975.
MLA Song Xiaoyan,et al."Soil moisture as a key factor in carbon release from thawing permafrost in a boreal forest".GEODERMA 357(2020):113975.
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