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Scientific reports v.6, 2016년, pp.38020 -    SCI SCIE
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Climate-driven increase of natural wetland methane emissions offset by human-induced wetland reduction in China over the past three decades

Zhu, Qiuan (State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling, 712100, China ) ; Peng, Changhui (Department of Biology Science, Institute of Environment Sciences, University of Quebec at Montreal, Montreal, H3C 3P8, Canada ) ; Liu, Jinxun (State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling, 712100, China ) ; Jiang, Hong (Department of Biology Science, Institute of Environment Sciences, University of Quebec at Montreal, Montreal, H3C 3P8, Canada ) ; Fang, Xiuqin (Western Geographic Science Center, US Geological Survey, Menlo Park, CA 94025, USA ) ; Chen, Huai (International Institute for Earth System Science, Nanjing University, Nanjing, 210093, China ) ; Niu, Zhenguo (Earth Science and Engineering, Hohai University, Nanjing, 210098, China ) ; Gong, Peng (Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China ) ; Lin, Guanghui (State Key Laboratory of Remote Sensing Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing, 100101, Chi ) ; Wang, Meng ; Wang, Han ; Yang, Yanzheng ; Chang, Jie ; Ge, Ying ; Xiang, Wenhua ; Deng, Xiangwen ; He, Jin-Sheng ;
  • 초록  

    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 (CH 4 ) emissions in China is important for improving our knowledge on CH 4 budgets locally and globally. However, their respective and combined effects are uncertain. We incorporated changes in wetland area derived from remote sensing into a dynamic CH 4 model to quantify the human and climate change induced contributions to natural wetland CH 4 emissions in China over the past three decades. Here we found that human-induced wetland loss contributed 34.3% to the CH 4 emissions reduction (0.92 TgCH 4 ), and climate change contributed 20.4% to the CH 4 emissions increase (0.31 TgCH 4 ), suggesting that decreasing CH 4 emissions due to human-induced wetland reductions has offset the increasing climate-driven CH 4 emissions. With climate change only, temperature was a dominant controlling factor for wetland CH 4 emissions 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 CH 4 emissions estimation.


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