The effect of vapor pressure deficit on water use efficiency at the subdaily time scale

被引：174

作者：

Zhou, Sha ^{[1
]}

Yu, Bofu ^{[2
]}

Huang, Yuefei ^{[1
]}

Wang, Guangqian ^{[1
]}

机构：

[1] Tsinghua Univ, Dept Hydraul Engn, State Key Lab Hydrosci & Engn, Beijing 100084, Peoples R China

[2] Griffith Univ, Sch Engn, Brisbane, Qld, Australia

来源：

GEOPHYSICAL RESEARCH LETTERS | 2014年 / 41卷 / 14期

基金：

中国国家自然科学基金;

关键词：

CARBON-DIOXIDE; CLIMATE-CHANGE; ELEVATED CO2; FOREST; TRANSPIRATION; INCREASES; LEAF; EVAPOTRANSPIRATION; DISCRIMINATION; ASSIMILATION;

D O I：

10.1002/2014GL060741

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Water use efficiency is a critical index for describing carbon-water coupling in terrestrial ecosystems. However, the nonlinear effect of vapor pressure deficit (VPD) on carbon-water coupling has not been fully considered. To improve the relationship between gross primary production (GPP) and evapotranspiration (ET) at the subdaily time scale, we propose a new underlying water use efficiency (uWUE=GPP.VPD0.5/ET) and a hysteresis model to minimize time lags among GPP, ET, and VPD. Half-hourly data were used to validate uWUE for seven vegetation types from 42 AmeriFlux sites. Correlation analysis shows that the GPP VPD0.5 and ET relationship (r =0.844) is better than that between GPP VPD and ET (r =0.802). The hysteresis model supports the GPP.VPD0.5 and ET relationship. As uWUE is related to CO2 concentration, its use can improve estimates of GPP and ET and help understand the effect of CO2 fertilization on carbon storage and water loss.

引用

页码：5005 / 5013

页数：9

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