Modeling methane dynamics in three wetlands in Northeastern China by using the CLM-Microbe model  

作　　者：Yunjiang Zuo Yihui Wang Liyuan He Nannan Wang Jianzhao Liu Fenghui Yuan Kexin Li Ziyu Guo Ying Sun Xinhao Zhu Lihua Zhang Changchun Song Li Sun Xiaofeng Xu 

机构地区：[1]Key Laboratory of Wetland Ecology and Environment,Northeast Institute of Geography and Agroecology,Chinese Academy of Sciences,Changchun,Jilin,China [2]University of the Chinese Academy of Sciences,Beijing,China [3]Biology Department,San Diego State University,San Diego,CA,USA [4]Key Laboratory of Forest Ecology and Management,Institute of Applied Ecology,Chinese Academy of Sciences,Shenyang,Liaoning,China [5]Department of Soil,Water,and Climate,University of Minnesota,Saint Paul,MN,USA [6]College of Life and Environmental Sciences,Minzu University of China,Beijing,China

出　　处：《Ecosystem Health and Sustainability》2022年第1期109-122,共14页生态系统健康与可持续性（英文）

基　　金：This study was partially supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDA28020502);the National Natural Science Foundation(No.41771102,41730643,32171873,41701198)of China;Northeast Institute of Geography and Agroecology,Chinese Academy of Sciences.

摘　　要：Wetlands account for up to 70%of the natural source of methane(CH_(4))in terrestrial ecosystems on a global scale.Soil microbes are the ultimate producers and biological consumers of CH_(4)in wetlands.Therefore,simulating microbial mechanisms of CH_(4)production and consumptionwould improve the predictability of CH_(4)flux in wetland ecosystems.In this study,we applied a microbial-explicit model,the CLM-Microbe,to simulate CH_(4)flux in three major natural wetlands in northeastern China.The CLM-Microbe model was able to capture the seasonal variation of gross primary productivity(GPP),dissolved organic carbon(DOC),and CH_(4)flux.The CLM-Microbe model explained more than 40%of the variation in GPP and CH_(4)flux across sites.Marsh wetlands had higher CH_(4)flux than mountain peatlands.Ebullition dominated the CH_(4)transport pathway in all three wetlands.The methanogenesis dominates while methanotroph makes a minor contribution to the CH_(4)flux,making all wetlands a CH_(4)source.Sensitivity analysis indicated that microbial growth and death rates are the key factors governing CH_(4)emission and vegetation physiological properties(flnr)and maintenance respiration predominate GPP variation.Explicitly simulating microbial processes allows genomic information to be incorporated,laying a foundation for better predicting CH_(4)dynamics under the changing environment.

关 键 词：CH_(4)flux MICROBE CLMMicrobe model WETLANDS 

分 类 号：X171[环境科学与工程—环境科学]