The potential effect of variations in climate and agricultural practice on N_2O emissions (Ⅱ)——Variations in agricultural practice  

作　　者：XU Wenbin~(1,2), HONG Yetang~1, CHEN Xuhui~3, LI Changsheng~4, LIN Qinghua~1 and WANG Yu~1, 1. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China 2. Institute of Environment and Resources Chemistry, Zhejiang University, Hangzhou 310027, China 3. Soil and Fertilizer Institute, Guizhou Academy of Agricultural Sciences, Guiyang 550013, China 4. Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, Durham, USA 

出　　处：《Chinese Science Bulletin》1999年第S2期97-99,共3页

摘　　要：WE expanded Decomposition-Denitrification （DNDC）modeling study to systematically assess the potential effect of farming practice on N₂O emission by choosing a corn-rape rotation and a soybean-winterwheat rotation field in Guizhou Province, westsouthern China, asN₂O emission from subtropical agricultural soil study plots. These sensitivity studies address questions relevant to issue of how change in fanning practice might be used to mitigate emissions. Manure additions had the most pronounced impact on N₂O emissions of farming practice simulatedand the influence of manure addition was nonlinear （fig. 1）. This result is consistent with previous studies for an Iowa corn field. The addition of manure remarkably elevates the level of organic carbon, enhances soil nitrogen mineralization, and increases the efficiency of N₂O production. Simulated results alsoshowed that the influence of manure additions on N₂O emission from soybean-winter wheat field had

关 键 词：N₂O emission farming practice POTENTIAL EFFECT agricultural soil. 

分 类 号：P595[天文地球—地球化学]