气候变化领域集成服务门户(CCPortal): When Does Vapor Pressure Deficit Drive or Reduce Evapotranspiration?

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DOI	10.1029/2019MS001790
	When Does Vapor Pressure Deficit Drive or Reduce Evapotranspiration?
	Massmann A.; Gentine P.; Lin C.
发表日期	2019
ISSN	19422466
起始页码	3305
结束页码	3320
卷号	11 期号:10
英文摘要	Increasing vapor pressure deficit (VPD) increases atmospheric demand for water. While increased evapotranspiration (ET) in response to increased atmospheric demand seems intuitive, plants are capable of reducing ET in response to increased VPD by closing their stomata. We examine which effect dominates the response to increasing VPD: atmospheric demand and increases in ET or plant response (stomata closure) and decreases in ET. We use Penman-Monteith, combined with semiempirical optimal stomatal regulation theory and underlying water use efficiency, to develop a theoretical framework for assessing ET response to VPD. The theory suggests that depending on the environment and plant characteristics, ET response to increasing VPD can vary from strongly decreasing to increasing, highlighting the diversity of plant water regulation strategies. The ET response varies due to (1) climate, with tropical and temperate climates more likely to exhibit a positive ET response to increasing VPD than boreal and arctic climates; (2) photosynthesis strategy, with C3 plants more likely to exhibit a positive ET response than C4 plants; and (3) plant type, with crops more likely to exhibit a positive ET response, and shrubs and gymniosperm trees more likely to exhibit a negative ET response. These results, derived from previous literature connecting plant parameters to plant and climate characteristics, highlight the utility of our simplified framework for understanding complex land-atmosphere systems in terms of idealized scenarios in which ET responds to VPD only. This response is otherwise challenging to assess in an environment where many processes coevolve together. ©2019. The Authors.
英文关键词	ecohydrology; ecosystem modeling; evapotranspiration; land-atmosphere interaction; stomatal conductance; vapor pressure deficit
语种	英语
scopus关键词	Ecosystems; Evapotranspiration; Hydrostatic pressure; Plants (botany); Vapor pressure; Water supply; Eco-hydrology; Ecosystem model; Land atmosphere interaction; Stomatal conductance; Vapor pressure deficit; Plant shutdowns; ecohydrology; ecosystem modeling; evapotranspiration; land-atmosphere interaction; photosynthesis; stomatal conductance; theoretical study; vapor pressure; water use efficiency
来源期刊	Journal of Advances in Modeling Earth Systems
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/156848
作者单位	Department of Earth and Environmental Engineering, Columbia University, New York, NY, United States; State Key Laboratory of Hydroscience and Engineering, Department of Hydraulic Engineering, Tsinghua University, Beijing, China
推荐引用方式 GB/T 7714	Massmann A.,Gentine P.,Lin C.. When Does Vapor Pressure Deficit Drive or Reduce Evapotranspiration?[J],2019,11(10).
APA	Massmann A.,Gentine P.,&Lin C..(2019).When Does Vapor Pressure Deficit Drive or Reduce Evapotranspiration?.Journal of Advances in Modeling Earth Systems,11(10).
MLA	Massmann A.,et al."When Does Vapor Pressure Deficit Drive or Reduce Evapotranspiration?".Journal of Advances in Modeling Earth Systems 11.10(2019).