Quantifying climate and management effects on regional crop yield and nitrogen leaching in the north china plain

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	Quantifying climate and management effects on regional crop yield and nitrogen leaching in the north china plain
	Yu Q.; Ma L.; Ma L.
	2013
关键词	Leaching Crops Grain (agricultural product) Irrigation Nitrogen Plants (botany) Soil moisture Water levels Water management
英文摘要	Better water and nitrogen (N) management requires better understanding of soil water and N balances and their effects on crop yield under various climate and soil conditions. In this study, the calibrated Root Zone Water Quality Model (RZWQM2) was used to assess crop yield and N leaching under current and alternative management practices in a double-cropped wheat (Triticum aestivum L.) and maize (Zea mays L.) system under longterm weather conditions (1970-2009) for dominant soil types at 15 locations in the North China Plain. The results provided quantitative long-term variation of deep seepage and N leaching at these locations, which strengthened the existing qualitative knowledge for site-specific management of water and N. In general, the current management practices showed high residual soil N and N leaching in the region, with the amounts varying between crops and from location to location and from year to year. Seasonal rainfall explained 39 to 84% of the variability in N leaching (1970-2009) in maize across locations, while for wheat, its relationship with N leaching was significant (P < 0.01) only at five locations. When N and/or irrigation inputs were reduced to 40 to 80% of their current levels, N leaching generally responded more to N rate than to irrigation, while the reverse was true for crop yield at most locations. Matching N input with crop requirements under limited water conditions helped achieve lower N leaching without considerable soil N accumulation. Based on the long-term simulation results and water resources availability in the region, it is recommended to irrigate at 60 to 80% of the current water levels and fertilize only at 40 to 60% of the current N rate to minimizing N leaching without compromising crop yield. American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.
出处	Journal of Environmental Quality
卷	42 期:5 页:1466-1479
收录类别	EI
语种	英语
内容类型	EI期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/31246]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Yu Q.,Ma L.,Ma L.. Quantifying climate and management effects on regional crop yield and nitrogen leaching in the north china plain. 2013.