The effect of vapor pressure deficit on water use efficiency at the subdaily time scale
作者： Sha Zhou , Bofu Yu , Yuefei Huang , Guangqian Wang
DOI: 10.1002/2014GL060741
关键词: Atmospheric sciences 、 Water-use efficiency 、 Vapour Pressure Deficit 、 Terrestrial ecosystem 、 Evapotranspiration 、 Scale (ratio) 、 Meteorology 、 Primary production 、 Carbon storage 、 Environmental science 、 Correlation analysis
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 has not been fully considered. To improve relationship between gross primary production (GPP) and evapotranspiration (ET) at subdaily time scale, we propose new underlying water (uWUE = GPP · VPD0.5/ET) hysteresis model to minimize lags among GPP, ET, VPD. Half-hourly data were used validate uWUE seven vegetation types from 42 AmeriFlux sites. Correlation analysis shows that GPP · VPD0.5 ET (r = 0.844) better than GPP · VPD (r = 0.802). The supports relationship. As related CO2 concentration, its can estimates GPP help understand fertilization carbon storage loss.
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