DOI: 10.5194/hess-19-3287-2015
Scopus记录号: 2-s2.0-84938500456
论文题名: Estimation of crop water requirements: Extending the one-step approach to dual crop coefficients
作者: Lhomme J ; P ; , Boudhina N ; , Masmoudi M ; M ; , Chehbouni A
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2015
卷: 19, 期: 7 起始页码: 3287
结束页码: 3299
语种: 英语
Scopus关键词: Balloons
; Crops
; Evapotranspiration
; Basal crop coefficients
; Crop evapotranspiration
; Crop water requirements
; Penman-Monteith equations
; Reference evapotranspiration
; Soil surface resistance
; Standard conditions
; Stomatal resistance
; Surface resistance
; biotransformation
; ecological modeling
; estimation method
; evapotranspiration
; mathematical analysis
; Penman-Monteith equation
; soil surface
; stomatal conductance
; water use
英文摘要: Crop water requirements are commonly estimated with the FAO-56 methodology based upon a two-step approach: first a reference evapotranspiration (ET0) is calculated from weather variables with the Penman-Monteith equation, then ET0 is multiplied by a tabulated crop-specific coefficient (Kc) to determine the water requirement (ETc) of a given crop under standard conditions. This method has been challenged to the benefit of a one-step approach, where crop evapotranspiration is directly calculated from a Penman-Monteith equation, its surface resistance replacing the crop coefficient. Whereas the transformation of the two-step approach into a one-step approach has been well documented when a single crop coefficient (Kc) is used, the case of dual crop coefficients (Kcb for the crop and Ke for the soil) has not been treated yet. The present paper examines this specific case. Using a full two-layer model as a reference, it is shown that the FAO-56 dual crop coefficient approach can be translated into a one-step approach based upon a modified combination equation. This equation has the basic form of the Penman-Monteith equation but its surface resistance is calculated as the parallel sum of a foliage resistance (replacing Kcb) and a soil surface resistance (replacing Ke). We also show that the foliage resistance, which depends on leaf stomatal resistance and leaf area, can be inferred from the basal crop coefficient (Kcb) in a way similar to the Matt-Shuttleworth method. © Author(s) 2015. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78462
Appears in Collections: 气候变化事实与影响
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作者单位: Institut de Recherche Pour le Développement (UMR LISAH), 2 Place Viala, Montpellier, France; Institut National Agronomique de Tunisie (INAT), 43 Avenue Charles Nicolle, Tunis, Tunisia; Institut de Recherche Pour le Développement (UMR CESBIO), 18 Avenue Edouard Belin, Toulouse, France
Recommended Citation:
Lhomme J,P,, Boudhina N,et al. Estimation of crop water requirements: Extending the one-step approach to dual crop coefficients[J]. Hydrology and Earth System Sciences,2015-01-01,19(7)