Profound loss of microbial necromass carbon in permafrost thaw-subsidence in the central Tibetan PlateauOA
Profound loss of microbial necromass carbon in permafrost thaw-subsidence in the central Tibetan Plateau
Climate warming is causing rapid permafrost degradation,including thaw-induced subsidence,potentially resulting in heightened carbon release.Nevertheless,our understanding of the levels and variations of carbon components in permafrost,particularly during the degradation process,remains limited.The uncertainties arising from this process lead to inaccurate assessments of the climate effects during permafrost degradation.With vast expanses of permafrost in the Tibetan Plateau,there is limited research available on SOC components,particularly in the central Tibetan Plateau.Given remarkable variations in hydrothermal conditions across different areas of the Tibetan Plateau,the existing limited studies make it challenging to assess the overall SOC components in the permafrost across the Tibetan Plateau and simulate their future changes.In this study,we examined the properties of soil organic carbon(SOC)and microbial necromass carbon(MicrobialNC)in a representative permafrost thaw-subsidence area at the southern edge of continuous permafrost in the central Tibetan Plateau.The results indicate that prior to the thaw-subsidence,the permafrost had a SOC content of 72.68±18.53 mg g-1,with MicrobialNC accounting for 49.6％.The thaw-subsidence of permafrost led to a 56.4％reduction in SOC,with MicrobialNC accounting for 70.0％of the lost SOC.MicrobialNC constitutes the primary component of permafrost SOC,and it is the main component that is lost during thaw-subsidence formation.Changes in MicrobialNC are primarily correlated with factors pH,plant input,and microbial properties.The present study holds crucial implications for both the ecological and biogeochemical processes associated with carbon release from permafrost,and it furnishes essential data necessary for modeling the global response of permafrost to climate warming.Based on this study and previous research,permafrost thawing in the Tibetan Plateau causes substantial loss of SOC.However,there's remarkable heterogeneity in SOC component changes across different regions,warranting further in-depth investigation.
Wen-Ting ZHOU;Dipesh RUPAKHETI;Da-He QIN;Xiu-Feng YIN;Quan-Lian LI;Shi-Chang KANG;Xiao-Dong WU;Tian MA;Xiao-Bo WU;Xin XIONG;Tanuj SHUKLA;Maheswar RUPAKHETI
Cryosphere Research Station on the Qinghai-Tibet Plateau,State Key Laboratory of Cryospheric Science,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China||Key Laboratory of Cryospheric Science and Frozen Soil Engineering,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China||University of Chinese Academy of Sciences,Beijing 100049,ChinaJiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control,Collaborative Innovation Center of Atmospheric Environment and Equipment Technology,School of Environmental Science and Engineering,Nanjing University of Information Science and Technology,Nanjing 210044,ChinaKey Laboratory of Cryospheric Science and Frozen Soil Engineering,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China||University of Chinese Academy of Sciences,Beijing 100049,ChinaCryosphere Research Station on the Qinghai-Tibet Plateau,State Key Laboratory of Cryospheric Science,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China||Key Laboratory of Cryospheric Science and Frozen Soil Engineering,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,ChinaKey Laboratory of Cryospheric Science and Frozen Soil Engineering,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,ChinaState Key Laboratory of Herbage Improvement and Grassland Agro-ecosystems,and College of Pastoral Agriculture Science and Technology,Lanzhou University,Lanzhou 730020,ChinaLushan Botanical Garden,Chinese Academy of Sciences,Jiujiang 332900,ChinaResearch Institute for Sustainability-Helmholtz Centre Potsdam,Potsdam 14467,Germany
Tibetan PlateauThaw-subsidenceSoil organic carbonMicrobial necromass carbonAmino sugars
《气候变化研究进展（英文版）》 2024 (004)
647-657 / 11
This study was supported by the National Natural Science Foundation of China(U23A2062,32361133551),State Key Laboratory of Cryospheric Science(SKLCS-ZZ-2023),Sec-ond Tibetan Plateau Scientific Expedition and Research Pro-gram(STEP,2019QZKK0605),and Natural Science Foundation of Gansu Province(21JR7RA500 and 22ZD6FA005).We appreciate Linwei Lu's great help in the field work.
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