您好，欢迎访问中国农业科学院 机构知识库！

全部

  • 全部
  • 标题
  • 学者
  • 机构
  • 关键词

Pathways of nitrogen loss and optimized nitrogen management for a rice cropping system in arid irrigation region, northwest China

文献类型： 外文期刊

作者： Zhan Xiaoying 1 ; Zhang Qingwen 1 ; Zhang Hui 4 ; Hussain, Hafiz Athar 1 ; Shaaban, Muhammad 5 ; Yang Zhengli 1 ;

作者机构： 1.Chinese Acad Agr Sci, Inst Environm & Sustainable Dev Agr, Agr Clean Watershed Res Grp, Beijing 100081, Peoples R China

2.Peking Univ, Coll Urban & Environm Sci, Beijing 100871, Peoples R China

3.Peking Univ, Minist Educ, Lab Earth Surface Proc, Beijing 100871, Peoples R China

4.Ningxia Vocat & Tech Coll, Yinchuan 750002, Ningxia, Peoples R China

5.Bahauddin Zakariya Univ, Fac Agr Sci & Technol, Dept Soil Sci, Multan, Pakistan

关键词： Nitrogen use efficiency; Nitrogen loss; Nitrogen budget; Emission factors; Arid irrigation region

期刊名称：JOURNAL OF ENVIRONMENTAL MANAGEMENT （ 影响因子：6.789； 五年影响因子：6.914 ）

ISSN： 0301-4797

年卷期： 2020 年 268 卷

页码：

收录情况： SCI

摘要： The reactive nitrogen (N) loss of the rice cropping system in the arid region shows a different pattern from that of subtropical humid region due to different climate types and crop management. However, little attention has been paid to this region. To fill this knowledge gap, a two-year (2009-2010) field observation was conducted in the Ningxia irrigation region, northwest China, to explore the major pathway of N loss following local farmers' optimal practice. Further, we determined the site-specific emission factors of ammonia and nitrous oxide, rate of surface runoff and subsurface (leaching and seepage) to improve the inventory resolution of arid irrigation region. Results showed that ammonia volatilization (45%-49% of total N loss), leaching and seepage (30%-33% of total N loss) were proved to be the primary factors of N loss in rice paddy fields. The emission factor of ammonia (21%) and N leaching rate (7.5%) following farmers' practice were 2.1 and 5.4 times higher than the country-specific default value in China. The country-specific N runoff rate and emission factor of N2O could be directly adopted in this region. A 20% reduction of N fertilizer to farmers' practice (300 kg N ha(-1)) alongside the application of organic fertilizer (30% N in synthetic fertilizer was substituted by pig manure) were considered to be the optimal N rate in this region. Our study can narrow the gap between researches on N loss in arid regions and subtropical humid regions. Meanwhile, the results can provide specific advice on N loss mitigation for policy makers in arid irrigation regions.

  • 相关文献
作者其他论文 更多>>
置顶
购物车
反馈

© 京ICP备09089781号-29 主办单位：中国农业科学院

学术资源： 中国农业科学院 农业专业知识服务系统 农科联盟资源共建共享平台 中国农业科技文献与信息服务平台 中国农业期刊集成服务平台