DOI: 10.1002/2016MS000901
Scopus记录号: 2-s2.0-85018376532
论文题名: Sensitivity of transpiration to subsurface properties: Exploration with a 1-D model
作者: Vrettas M ; D ; , Fung I ; Y
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2017
卷: 9, 期: 2 起始页码: 1030
结束页码: 1045
语种: 英语
英文关键词: Climatology
; Drought
; Evapotranspiration
; Hydraulic conductivity
; Moisture
; Reservoirs (water)
; Stochastic systems
; Vegetation
; Dry seasons
; Mediterranean climates
; Model experiments
; Root-water uptake
; Rooting depths
; Subsurface properties
; Weathered bedrock
; Winter rains
; Stochastic models
; climate feedback
; dry season
; evapotranspiration
; hydraulic conductivity
; infiltration
; insolation
; Mediterranean environment
; moisture transfer
; one-dimensional modeling
; parameterization
; precipitation (climatology)
; rhizosphere
; root
; sensitivity analysis
; statistical analysis
; transpiration
; water uptake
英文摘要: The amount of moisture transpired by vegetation is critically tied to the moisture supply accessible to the root zone. In a Mediterranean climate, integrated evapotranspiration (ET) is typically greater in the dry summer when there is an uninterrupted period of high insolation. We present a 1-D model to explore the subsurface factors that may sustain ET through the dry season. The model includes a stochastic parameterization of hydraulic conductivity, root water uptake efficiency, and hydraulic redistribution by plant roots. Model experiments vary the precipitation, the magnitude and seasonality of ET demand, as well as rooting profiles and rooting depths of the vegetation. The results show that the amount of subsurface moisture remaining at the end of the wet winter is determined by the competition among abundant precipitation input, fast infiltration, and winter ET demand. The weathered bedrock retains (Formula presented.) of the winter rain and provides a substantial moisture reservoir that may sustain ET of deep-rooted (>8 m) trees through the dry season. A small negative feedback exists in the root zone, where the depletion of moisture by ET decreases hydraulic conductivity and enhances the retention of moisture. Hence, hydraulic redistribution by plant roots is impactful in a dry season, or with a less conductive subsurface. Suggestions for implementing the model in the CESM are discussed. © 2017. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75803
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Department of Earth and Planetary Science, University of California, Berkeley, CA, United States; Now at Central Laser Facility, Rutherford Appleton Laboratory, Harwell Campus, Oxford, United Kingdom
Recommended Citation:
Vrettas M,D,, Fung I,et al. Sensitivity of transpiration to subsurface properties: Exploration with a 1-D model[J]. Journal of Advances in Modeling Earth Systems,2017-01-01,9(2)