土壤-植物-大气层系统中水分的传输模型

土壤-植物-大气层系统中水分的传输模型

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contributed at 2018-12-04

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Affiliation:  
岳天祥编著
Email:  
yue@lreis.ac.cn
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Application-focused categoriesNatural-perspectiveLand regions
Application-focused categoriesNatural-perspectiveAtmospheric regions

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Chinese {{currentDetailLanguage}} Chinese

土壤-植物-大气层系统中水分的传输模型

(1)土壤水分特性:

              τ=τ0expaθ0-θ)

D=D0expbθ-θ0

式中,D为扩散率;τ土壤水的许可潜力;τ0D0,a和b是特定土壤的常数;θ是土壤水的体积密度。

ζ=D/25.7=-25.7/τ=(25.7K)1/2

式中,ζ是水潜力函数;K是土壤水传导率。

(2)气候环境对蒸腾作用的影响:

       每单位面积农作物的蒸腾作用率(E):

式中,DV是大气中水蒸气分子扩散系数;ρ是液态水的密度;LSLa是水蒸气通过气孔离开农作物传输路径的有效长度;c0c分别是在蒸发表面和在农作物以上任意高度的水蒸气浓度。

(3)将紊流传输和能量平衡结合起来可发现:

式中,△是饱和水蒸气浓度的斜率;室温下水分的温度曲线;H是净辐射的垂直流量;S是到达地面的热流量;λ是液态水的水蒸气潜热;γ是一个干湿度常数;δ是大气层中水蒸气浓度差额。

(4)农作物因子的影响:

        我们可以通过下式把农作物每单位面积的蒸腾作用率和通过植物的液态水流动关联起来:

                           

式中,ψ是农作物叶片中的水潜能;Z是农作物单位面积上对水分传输的内部阻力;τΓ是在根表面上土壤水潜能。

                           

式中,EW是在叶片水分潜能的临界条件下,土壤-植被系统将水分供应到叶片的能力的一个量度;ψWφ的临界潜能。

CowanI R:土壤-植物-大气层系统中水分的传输。Journal of Applied Ecology,1966,2(1)

 

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How to Cite

《资源环境数学模型手册》 (2018). 土壤-植物-大气层系统中水分的传输模型, Model Item, OpenGMS, https://geomodeling.njnu.edu.cn/modelItem/95a4e50f-a3d6-496b-97f3-39f453422697
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Last modifier : 
zhangshuo
Last modify time : 
2020-11-30
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Contributor(s)

Initial contribute: 2018-12-04

Authorship

Affiliation:  
岳天祥编著
Email:  
yue@lreis.ac.cn
Homepage:  
View
Is authorship not correct? Feedback

History

Last modifier : 
zhangshuo
Last modify time : 
2020-11-30
Modify times : 
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