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- W221571944 abstract "Soil water movement parameters are necessary for the solution of the basic soil water movement equation.The unsaturated soil water diffusivity is one of the important parameters of studying soil water and salt movement.It is difficult to determine the unsaturated soil water diffusivity in the field.This paper describes the basic principle and method of determining soil water diffusivity by means of wet front advancing in a horizontal soil column in laboratory.The water diffusion processes and unsaturated soil water diffusivities in cotton field of Aral Oasis Irrigated District in Tarim River Basin have been determined and calculated using this method.The relationships between Boltzmann transformation parameter λ and unsaturated soil water diffusivity D and soil water content θ were established quantificationally,and these relationships make the process of calculating unsaturated soil water diffusivity very easy.It is found that: the unsaturated soil water diffusivity is monotone increasing function with soil water content.When soil water content tends to saturated soil water content,the unsaturated soil water diffusivity should tend to infinity,but when independent variable equal to a constant,exponential function or power function also tends to a constant.So,exponential function or power function could not describe the quantitative relationship between soil water diffusivity and soil water content.The new function of unsaturated soil water diffusivity and soil water content presented in this paper better reflect the object laws of unsaturated soil water diffusivity and soil water content." @default.
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- W221571944 date "2009-01-01" @default.
- W221571944 modified "2023-09-22" @default.
- W221571944 title "Measurement of unsaturated soil water diffusivity in cotton field of Aral Oasis irrigated district" @default.
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