Spatial patterns of nitrogen runoff from Chinese paddy fields

doi:10.1016/j.agee.2016.07.001

CORC > 北京大学 > 城市与环境学院

	Spatial patterns of nitrogen runoff from Chinese paddy fields
	Hou, Xikang ; Zhou, Feng ; Leip, Adrain ; Fu, Bojie ; Yang, Hui ; Chen, Yan ; Gao, Shuoshuo ; Shang, Ziyin ; Ma, Lekuan
刊名	AGRICULTURE ECOSYSTEMS & ENVIRONMENT
	2016
关键词	Nitrogen loss Surface runoff Paddy soils Nonlinear response Spatial variation Climate change AGRICULTURAL SOILS PHOSPHORUS LOSSES BALTIC SEA NITRATE EXPORT MODEL WATER LAND FERTILIZATION VARIABILITY
DOI	10.1016/j.agee.2016.07.001
英文摘要	Fertilizer additions (N-rate) have increased surface runoff of nitrogen (R-TN) from croplands, which is eventually transferred to rivers. This pollution further contributes to ecological degradation and and health risks of drinking waters. Despite this recognition, little is known about the spatial pattern of R-TN from croplands and the drivers of its variation. On the basis of 210 site-years of measurements at 41 sites in Chinese paddy fields, we examined the nonlinear response of R-TN to N-rate and the effects of environmental factors on R-TN, R-TN per unit nitrogen fertilizer additions (RR), and background N runoff (R-0). The results show that (i) R-TN-N-rate relationship deviates from linearity and the parameters vary by climate and soil attributes; (ii) Observed variation of R-TN is better explained by precipitation and clay content (48%) than N-rate and its interaction (17%); (iii) The R-TN is 1.09 +/- 0.36 Tg N yr(-1) for Chinese paddy fields in 2008, to which R-0 contributes more than 50%, and the corresponding average RR is 6.8 +/- 1.7% (1 - sigma), 30% lower than the linear model. This study therefore suggests that the future policies for agricultural N runoff need to account for local environmental conditions rather than solely attempting to reduce N fertilizer applications. (C) 2016 Elsevier B.V. All rights reserved.; National Major Research and Development Program [2016YFD0800501]; National Water Science and Technology Research Project [2013ZX07102-006]; National Natural Science Foundation of China [41201077, 41561134016, 41530528]; 111 Project [B14001]; SCI(E); ARTICLE; zhouf@pku.edu.cn; malk@caep.org.cn; 246-254; 231
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/491436]
专题	城市与环境学院
推荐引用方式 GB/T 7714	Hou, Xikang,Zhou, Feng,Leip, Adrain,et al. Spatial patterns of nitrogen runoff from Chinese paddy fields[J]. AGRICULTURE ECOSYSTEMS & ENVIRONMENT,2016.
APA	Hou, Xikang.,Zhou, Feng.,Leip, Adrain.,Fu, Bojie.,Yang, Hui.,...&Ma, Lekuan.(2016).Spatial patterns of nitrogen runoff from Chinese paddy fields.AGRICULTURE ECOSYSTEMS & ENVIRONMENT.
MLA	Hou, Xikang,et al."Spatial patterns of nitrogen runoff from Chinese paddy fields".AGRICULTURE ECOSYSTEMS & ENVIRONMENT (2016).