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Modeling plant transpiration under limited  soil water: comparison of different plant  and soil hydraulic parameterizations and  preliminary implications for their use in  land surface models

Opened Access Modeling plant transpiration under limited  soil water: comparison of different plant  and soil hydraulic parameterizations and  preliminary implications for their use in  land surface models

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Autor: Verhoef, Anne
Egea Cegarra, Gregorio
Departamento: Universidad de Sevilla. Departamento de Ingeniería Aeroespacial y Mecánica de Fluidos
Universidad de Sevilla. Departamento de Ciencias Agroforestales
Fecha: 2014
Publicado en: Agricultural and Forest Meteorology, 2014 (191), 22-32.
Tipo de documento: Artículo
Resumen: Accurate estimates of how soil water stress affects plant transpiration are crucial for reliable land surface model (LSM) predictions. Current LSMs generally use a water stress factor, β, dependent on soil moisture content, θ, that ranges linearly between β = 1 for unstressed vegetation and β = 0 when wilting point is reached. This paper explores the feasibility of replacing the current approach with equations that use soil water potential as their independent variable, or with a set of equations that involve hydraulic and chemical signaling, thereby ensuring feedbacks between the entire soil–root–xylem–leaf system. A comparison with the original linear θ-based water stress parameterization, and with its improved curvi-linear version, was conducted. Assessment of model suitability was focused on their ability to simulate the correct (as derived from experimental data) curve shape of relative transpiration versus fraction of transpirable soil water. We used model sensitivity analyses u...
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Cita: Verhoef, A. y Egea Cegarra, G. (2014). Modeling plant transpiration under limited  soil water: comparison of different plant  and soil hydraulic parameterizations and  preliminary implications for their use in  land surface models. Agricultural and Forest Meteorology, 2014 (191), 22-32.
Tamaño: 1.832Mb
Formato: PDF

URI: https://hdl.handle.net/11441/74330

DOI: 10.1016/j.agrformet.2014.02.009

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