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	Inter-relations of yield, evapotranspiration, and water use efficiency from marginal analysis of water production functions
	Liu W. Z. ; Hunsaker D. J. ; Li Y. S. ; Xie X. Q. ; Wall G. W.
	2002
英文摘要	The study uses the concepts of marginal water use efficiency (MWLTE), and elasticity of water production (EWP) to reveal the dynamic interrelations of crop yield (Y), seasonal evapotranspiration (ET), and water use efficiency (WUE) based on the functional relation of an ET production function (ETPF). When the ETPF is linear, the changing trend of WUE with ET is directly affected by the intercept of the function, and the EWP will be numerically equivalent to a yield response factor (K-y) when ET reaches maximum ET (ETm). When the ETPF is quadratic, the ET needed to maximise WUE is less than the ET for maximum yield (Y-m), and the ET value that occurs at maximum WUE equals the arithmetic square root of the ratio of the intercept of the function to the coefficient of function quadratic term. The interrelationships of Y ET, and WUE are demonstrated using a quadratic ETPF developed for maize from data obtained in a field experiment. (C) 2002 Elsevier Science B.V. All rights reserved.
出处	Agricultural Water Management
卷	56
期	2
页	143-151
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/311030/23425]
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	Liu W. Z.,Hunsaker D. J.,Li Y. S.,et al. Inter-relations of yield, evapotranspiration, and water use efficiency from marginal analysis of water production functions. 2002.

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