论文编号:
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)
刊物名称: Atmospheric Environment
卷期页码: 55, , 240-244
发表年度: 2012
DOI: http://dx.doi.org/10.1016/j.atmosenv.2012.02.077
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