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Carbon fluxes and soil carbon dynamics along a gradient of biogeomorphic succession in alpine wetlands of Tibetan Plateau

查看全文 作　　者：Hao [1,2]Wang;Lingfei [3]Yu;Litong [4]Chen;Zhenhua [4]Zhang;Xuefei [5]Li;Naishen [6]Liang;Changhui [7]Peng;Jin-Sheng [2,8]He 高影响力作者 机构地区：[1]State Key Laboratory of Herbage Improvement and Grassland Agro-ecosystems,College of Ecology,Lanzhou University,Lanzhou 730000,China;[2]Institute of Ecology,College of Urban and Environmental Sciences,and Key Laboratory for Earth Surface Processes of the Ministry of Education,Peking University,Beijing 100871,China;[3]State Key Laboratory of Vegetation and Environmental Change,Institute of Botany,Chinese Academy of Sciences,Beijing 100093,China;[4]Qinghai Haibei National Field Research Station of Alpine Grassland Ecosystem,and Key Laboratory of Adaptation and Evolution of Plateau Biota,Northwest Institute of Plateau Biology,Chinese Academy of Sciences,Xining 810008,China;[5]Institute for Atmospheric and Earth System Research(INAR)/Physics,Faculty of Science,University of Helsinki,P.O.Box 68,Helsinki FI-00014,Finland;[6]Earth System Division,National Institute for Environmental Studies,Tsukuba,Ibaraki 305-8506,Japan g;[7]Department of Biology Sciences,Institute of Environment Sciences,University of Quebec at Montreal,Montreal,QC H3C 3P8,Canada;[8]State Key Laboratory of Herbage Improvement and Grassland Agro-ecosystems,College of Pastoral Agriculture Science and Technology,Lanzhou University,Lanzhou 730000,China高影响力机构 出　　处：《Fundamental Research》索引2023年第3卷第2期,共9页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China (32130065,31901145,32111530062);the Discipline Construction Fund of Peking University and the Academy of Finland (341294). 摘　　要：Hydrological changes under climate warming drive the biogeomorphic succession of wetlands and may trigger substantial carbon loss from the carbon-rich ecosystems.Although many studies have explored the responses of wetland carbon emissions to short-term hydrological change,it remains poorly understood how the carbon cycle evolves with hydrology-driven wetland succession.Here,we used a space-for-time approach across hydrological gradients on the Tibetan Plateau to examine the dynamics of ecosystem carbon fluxes(carbon dioxide(CO_(2))and methane(CH4))and soil organic carbon pools during alpine wetland succession.We found that the succession from mesic meadow to fen changed the seasonality of both CO_(2) and CH4 fluxes,which was related to the shift in plant community composition,enhanced regulation of soil hydrology and increasing contribution of spring-thaw emission.The paludification caused a switch from net uptake of gaseous carbon to net release on an annual timescale but produced a large accumulation of soil organic carbon.We attempted to attribute the paradox between evidence from the carbon fluxes and pools to the lateral carbon input and the systematic changes of historical climate,given that the wetlands are spatially low-lying with strong temporal climate-carbon cycle interactions.These findings demonstrate a systematic change in the carbon cycle with succession and suggest that biogeomorphic succession and lateral carbon flows are both important for understanding the long-term dynamics of wetland carbon footprints. 关 键 词：Carbon dioxide METHANE Soil organic carbon Climate change Hydrological change
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