Yield-scaled N2O emissions in a winter wheat-summer corn double-cropping system----中国科学院遗传发育所农业资源研究中心

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论文

论文题目	Yield-scaled N2O emissions in a winter wheat-summer corn double-cropping system
作　　者	Shuping Qin（秦树平）, Yuying Wang （王玉英）, Chunsheng Hu （胡春胜）, Oene Oenema, Xiaoxin Li （李晓欣）,Yuming Zhang （张玉铭）, Wenxu Dong （董文旭）;
发表年度	2012
刊物名称	Atmospheric Environment
卷、期、页码	55; ; 240-244
影响因子
论文摘要	Emissions of nitrous oxide (N₂O) from agricultural soils contribute to global warming and stratospheric ozone depletion. Applications of fertilizer nitrogen (N) increase N₂O emission, but also increase agricultural production. Here, we report on the responses of crop yield, N₂O emission and yield-scaled N₂O emission (N₂O emission per unit N uptake by grain and aboveground biomass) to different N fertilizer rates in a winter wheatesummer corn double-cropping system in the North China Plain. Soil N2O emission measurements were carried out for two years in a long-term field experiment, under semi-arid conditions with four flood irrigations events per year. Our results indicated that N₂O emissions were linear functions and yield-scaled N₂O emissions were cubic functions of N fertilizer application rate. Yield-scaled N₂O emissions were lowest at application rates of 136 kg N ha^_1 yr^_1. Using a quadraticplateau model, it was found that maximal crop yields were achieved at an application rate of 317 kg N ha^_1 y^r_1, which is 20% less than current practice. This level is suggested to be a compromise between achieving food security and mitigation N₂O emissions.
全文链接	http://dx.doi.org/10.1016/j.atmosenv.2012.02.077
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