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	Ecosystem water use efficiency in a warm-temperate mixed plantation in the North China
	Li J.; Li J.
	2014
关键词	Mixed plantation Gross primary productivity Evapotranspiration Water use efficiency Eddy covariance carbon-dioxide vapor exchange forest ecosystems deciduous forest eddy covariance aspen forest co2 responses drought impact
英文摘要	Water use efficiency (WUE) at the ecosystem level is an important ecophysiological index reflecting the coupling relationship between water and carbon cycles. CO2 and water vapor fluxes were measured by the eddy covariance method during the period 2006-2010 over a warm-temperate mixed plantation in the North China. The seasonal and interannual variations of gross primary productivity (GPP), evapotranspiration (ET) and ecosystem WUE were analyzed, and the impacts of climatic variables and soil moisture on GPP, ET and WUE were discussed. At the monthly scale, GPP and ET had similar relations with solar radiation, air temperature, vapor pressure deficit (VPD) and precipitation. It is suggested that photosynthesis and evapotranspiration were driven by climatic variables at the approximately equal strength. During the growing season, VVUE decreased significantly with the increase of VPD and solar radiation. Cloudiness can improve photosynthesis and enhance VVUE. GPP was 9-39% greater but ET was 8-26% lower under cloudy sky conditions than that under sunny sky conditions. Therefore, WUE was 29-72% higher under cloudy skies in comparison with that under sunny skies. Annual average VVUE ranged from 1.76 to 2.41 g C kg(-1) H2O. The major driver of interannual variability in WUE was soil water content in May. (c) 2014 Published by Elsevier B.V.
出处	Journal of Hydrology
卷	512
页	221-228
收录类别	SCI
语种	英语
ISSN号	0022-1694
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/29577]
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	Li J.,Li J.. Ecosystem water use efficiency in a warm-temperate mixed plantation in the North China. 2014.

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