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	Water resources and water use efficiency in the North China Plain: Current status and agronomic management options
	Ma L.; Ma L.; Yu Q.
	2010
关键词	Water deficit Water use efficiency Water production Agronomic management Systems modeling North China Plain double-cropping system root-zone irrigation yellow-river basin regulated deficit irrigation winter-wheat climate-change stress index reference evapotranspiration institutional reform saving agriculture
英文摘要	Serious water deficits and deteriorating environmental quality are threatening agricultural sustainability in the North China Plain (NCP). This paper addresses spatial and temporal availability of water resources in the NCP, identifies the effects of soil management, irrigation timing and amounts, and crop genetic improvement on water use efficiency (WUE), and then discusses knowledge gaps and research priorities to further improve WUE. Enhanced irrigation and soil nutrient (mainly nitrogen) management are the focal issues in the NCP for enhancing WUE, which are shown to increase WUE by 10-25% in a wheat-maize double cropping system. Crop breeding has also contributed to increased of WUE and is expected to play an important role in the future as genetic and environmental interactions are understood better. Agricultural system models and remote sensing have been used to evaluate and improve current agronomic management practices for increasing WUE at field and regional scales. The low WUE in farmer's fields compared with well-managed experimental sites indicates that more efforts are needed to transfer water-saving technologies to the farmers. We also identified several knowledge gaps for further increasing WUE in the NCP by: (1) increasing scientific understanding of the effects of agronomic management on WUE across various soil and climate conditions; (2) quantifying the interaction between soil water and nitrogen in water-limited agriculture for improving both water and nitrogen-use efficiency; (3) improving irrigation practices (timing and amounts) based on real-time monitoring of water status in soil-crop systems; and (4) maximizing regional WUE by managing water resources and allocation at regional scales. (C) 2010 Elsevier B.V. All rights reserved.
出处	Agricultural Water Management
卷	97
期	8
页	1102-1116
收录类别	SCI
语种	英语
ISSN号	0378-3774
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/24046]
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	Ma L.,Ma L.,Yu Q.. Water resources and water use efficiency in the North China Plain: Current status and agronomic management options. 2010.

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