title: Climate-driven increase of natural wetland methane emissions offset by human-induced wetland reduction in China over the past three decades.
abstract: Both anthropogenic activities and climate change can affect the biogeochemical processes of natural wetland methanogenesis. Quantifying possible impacts of changing climate and wetland area on wetland methane (CH4) emissions in China is important for improving our knowledge on CH4budgets locally and globally. However, their respective and combined effects are uncertain. We incorporated changes in wetland area derived from remote sensing into a dynamic CH4model to quantify the human and climate change induced contributions to natural wetland CH4emissions in China over the past three decades. Here we found that human-induced wetland loss contributed 34.3% to the CH4emissions reduction (0.92 TgCH4), and climate change contributed 20.4% to the CH4emissions increase (0.31 TgCH4), suggesting that decreasing CH4emissions due to human-induced wetland reductions has offset the increasing climate-driven CH4emissions. With climate change only, temperature was a dominant controlling factor for wetland CH4emissions in the northeast (high latitude) and Qinghai-Tibet Plateau (high altitude) regions, whereas precipitation had a considerable influence in relative arid north China. The inevitable uncertainties caused by the asynchronous for different regions or periods due to inter-annual or seasonal variations among remote sensing images should be considered in the wetland CH4emissions estimation.
authors.affiliation: State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling, 712100, China.|Department of Biology Science, Institute of Environment Sciences, University of Quebec at Montreal, Montreal, H3C 3P8, Canada.
authors.forename: Qiuan
authors.initials: Q
authors.lastname: Zhu
authors.affiliation: State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling, 712100, China.|Department of Biology Science, Institute of Environment Sciences, University of Quebec at Montreal, Montreal, H3C 3P8, Canada.
authors.forename: Changhui
authors.initials: C
authors.lastname: Peng
authors.affiliation: Western Geographic Science Center, US Geological Survey, Menlo Park, CA 94025, USA.
authors.forename: Jinxun
authors.initials: J
authors.lastname: Liu
authors.affiliation: International Institute for Earth System Science, Nanjing University, Nanjing, 210093, China.
authors.forename: Hong
authors.initials: H
authors.lastname: Jiang
authors.affiliation: Earth Science and Engineering, Hohai University, Nanjing, 210098, China.
authors.forename: Xiuqin
authors.initials: X
authors.lastname: Fang
authors.affiliation: Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China.
authors.forename: Huai
authors.initials: H
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Remote Sensing Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing, 100101, China.
authors.forename: Zhenguo
authors.initials: Z
authors.lastname: Niu
authors.affiliation: Ministry of Education for Earth System Modeling, Center for Earth System Science, Tsinghua University, Beijing, 100084, China.
authors.forename: Peng
authors.initials: P
authors.lastname: Gong
authors.affiliation: Ministry of Education for Earth System Modeling, Center for Earth System Science, Tsinghua University, Beijing, 100084, China.
authors.forename: Guanghui
authors.initials: G
authors.lastname: Lin
authors.affiliation: State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling, 712100, China.
authors.forename: Meng
authors.initials: M
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling, 712100, China.
authors.forename: Han
authors.initials: H
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling, 712100, China.
authors.forename: Yanzheng
authors.initials: Y
authors.lastname: Yang
authors.affiliation: College of Life Sciences, Zhejiang University, Hangzhou, 310058, China.
authors.forename: Jie
authors.initials: J
authors.lastname: Chang
authors.affiliation: College of Life Sciences, Zhejiang University, Hangzhou, 310058, China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Ge
authors.affiliation: National Engineering Laboratory for Applied Technology of Forestry&Ecology in South China, Central South University of Forestry and Technology, Changsha, 410004, China.
authors.forename: Wenhua
authors.initials: W
authors.lastname: Xiang
authors.affiliation: National Engineering Laboratory for Applied Technology of Forestry&Ecology in South China, Central South University of Forestry and Technology, Changsha, 410004, China.
authors.forename: Xiangwen
authors.initials: X
authors.lastname: Deng
authors.affiliation: Department of Ecology, Peking University, Beijing, 100871, China.
authors.forename: Jin-Sheng
authors.initials: JS
authors.lastname: He
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D002681:China; D057231:Climate Change; D004784:Environmental Monitoring; D006801:Humans; D008697:Methane / Q000032:analysis*; D058998:Remote Sensing Technology; D012621:Seasons; D053833:Wetlands
chemical_list: D000393:Air Pollutants; D008697:Methane