DOI: 10.1002/2014GL060741
论文题名: The effect of vapor pressure deficit on water use efficiency at the subdaily time scale
作者: Zhou S. ; Yu B. ; Huang Y. ; Wang G.
刊名: Geophysical Research Letters
ISSN: 0094-9945
EISSN: 1944-9676
出版年: 2014
卷: 41, 期: 14 起始页码: 5005
结束页码: 5013
语种: 英语
英文关键词: evapotranspiration
; gross primary production
; hysteresis
; subdaily time scale
; underlying water use efficiency
; vapor pressure deficit
Scopus关键词: Carbon
; Carbon dioxide
; Efficiency
; Evapotranspiration
; Hysteresis
; Hysteresis loops
; Time measurement
; Correlation analysis
; Critical indexes
; Gross primary production
; Hysteresis modeling
; Terrestrial ecosystems
; Time-scales
; Vapor pressure deficit
; Water use efficiency
; Water supply
; carbon dioxide
; carbon sequestration
; evapotranspiration
; hysteresis
; net primary production
; timescale
; vapor pressure
; vegetation type
英文摘要: 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. © 2014. The Authors. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84904777446&doi=10.1002%2f2014GL060741&partnerID=40&md5=ca6cd0a6c3fdb92c1aa17c4bd12f35dd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7209
Appears in Collections: 气候减缓与适应
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作者单位: State Key Laboratory of Hydroscience and Engineering, Department of Hydraulic Engineering, Tsinghua University, Beijing, China
Recommended Citation:
Zhou S.,Yu B.,Huang Y.,et al. The effect of vapor pressure deficit on water use efficiency at the subdaily time scale[J]. Geophysical Research Letters,2014-01-01,41(14).