Biogeosciences Discussions www.biogeosciences-discuss.net 1810-6277 1810-6285 5 6 2008 10.5194/bgd-5-4867-2008 http://www.biogeosciences-discuss.net/5/4867/2008/ http://www.biogeosciences-discuss.net/5/4867/2008/bgd-5-4867-2008.html http://www.biogeosciences-discuss.net/5/4867/2008/bgd-5-4867-2008.pdf 4867 4896 2008-12-11 Quantifying methane emissions from rice fields in Tai-Lake region, China by coupling detailed soil database with biogeochemical model L. Zhang D. Yu dshyu@issas.ac.cn X. Shi xzshi@issas.ac.cn L. Zhao W. Ding H. Wang J. Pan C. Li State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, China Institute for the Study of Earth, Oceans and Space, University of New Hampshire, Durham, NH, USA China's paddy rice accounts for about 22% of the world's rice fields, therefore it is crucial to accurately estimate the CH₄ emissions at regional scale to gauge their contribution to global greenhouse gas effect. This paper reports an application of a biogeochemical model, DeNitrification and DeComposition or DNDC, for quantifying CH₄ emissions from rice fields in Tai-Lake region of China by linking DNDC to a 1:50 000 soil database, which was derived from 1107 paddy soil profiles in the Second National Soil Survey of China in the 1980s–1990s. The modeled results estimate that the 2.34 M ha of paddy rice fields in Tai-Lake region emitted about CH₄ of 5.67 Tg C for the period of 1982–2000, with the average CH₄ flux ranged from 114 to 138 kg C ha^−1y^−1. The highest emission rate (659.24 kg C ha^−1 y^−1) occurred in the subgroup of "gleyed paddy soils", while the lowest (90.72 kg C ha^−1y^−1) were associated with the subgroup "degleyed paddy soils". The subgroup "hydromorphic paddy soils" accounted for about 52.82% of the total area of paddy soils, the largest of areas of all the soil subgroups, with the CH₄ flux rate of 106.47 kg C ha^−1y^−1. On a sub-regional basis, the annual average CH₄ flux in the Tai-Lake plain soil region and alluvial plain soil region was higher than that in low mountainous and hilly soil region and polder soil region. The model simulation was conducted with two databases using polygon or county as the basic unit. 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