Methane emissions from rice paddies natural wetlands,lakes in China: synthesis new estimate |
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Authors: | Huai Chen Qiu'an Zhu Changhui Peng Ning Wu Yanfen Wang Xiuqin Fang Hong Jiang Wenhua Xiang Jie Chang Xiangwen Deng Guirui Yu |
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Institution: | 1. Laboratory for Ecological Forecasting and Global Change, Northwest A&F University, , Yangling, 712100 China;2. Chengdu Institute of Biology, Chinese Academy of Sciences, , Chengdu, 610041 China;3. Department of Biology Sciences, Institute of Environment Sciences, University of Quebec, , Montreal, QC, Canada, H3C 3P8;4. International Centre for Integrated Mountain Development, , GPO Box 3226, Khumaltar, Kathmandu, Nepal;5. College of Life Sciences, Graduate University of Chinese Academy of Sciences, , Beijing, 100049 China;6. Department of Geographical Science, Nanjing University, , Nanjing, 210093 China;7. Ecology Research Section, Central‐South University of Forestry and Technology, , Changsha, Hunan, 410004 China;8. College of Life Sciences, Zhejiang University, , Hangzhou, 310058 China;9. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, , Beijing, 100101 China |
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Abstract: | Sources of methane (CH4) become highly variable for countries undergoing a heightened period of development due to both human activity and climate change. An urgent need therefore exists to budget key sources of CH4, such as wetlands (rice paddies and natural wetlands) and lakes (including reservoirs and ponds), which are sensitive to these changes. For this study, references in relation to CH4 emissions from rice paddies, natural wetlands, and lakes in China were first reviewed and then reestimated based on the review itself. Total emissions from the three CH4 sources were 11.25 Tg CH4 yr?1 (ranging from 7.98 to 15.16 Tg CH4 yr?1). Among the emissions, 8.11 Tg CH4 yr?1 (ranging from 5.20 to 11.36 Tg CH4 yr?1) derived from rice paddies, 2.69 Tg CH4 yr?1 (ranging from 2.46 to 3.20 Tg CH4 yr?1) from natural wetlands, and 0.46 Tg CH4 yr?1 (ranging from 0.33 to 0.59 Tg CH4 yr?1) from lakes (including reservoirs and ponds). Plentiful water and warm conditions, as well as its large rice paddy area make rice paddies in southeastern China the greatest overall source of CH4, accounting for approximately 55% of total paddy emissions. Natural wetland estimates were slightly higher than the other estimates owing to the higher CH4 emissions recorded within Qinghai‐Tibetan Plateau peatlands. Total CH4 emissions from lakes were estimated for the first time by this study, with three quarters from the littoral zone and one quarter from lake surfaces. Rice paddies, natural wetlands, and lakes are not constant sources of CH4, but decreasing ones influenced by anthropogenic activity and climate change. A new progress‐based model used in conjunction with more observations through model‐data fusion approach could help obtain better estimates and insights with regard to CH4 emissions deriving from wetlands and lakes in China. |
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Keywords: | agriculture anthropogenic activity CH4 budget climate change Qinghai‐Tibetan Plateau |
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