新疆阿瓦提丰收灌区砂壤土非饱和土壤水分运动参数的测定与计算

摘要

采用负压计法和双环入渗法在田间分别测定了阿瓦提丰收灌区砂壤土土壤含水率及其对应的土壤水吸力和土壤饱和导水率,采用Sigmaplot软件拟合了Van Genuchten水分特征曲线公式.根据Mualem提出的非饱和土壤导水率公式,建立了该灌区砂壤土非饱和土壤导水率的计算公式,并间接推导了非饱和土壤扩散率和比水容量两个参数的计算公式.%Soil water movement parameters are necessary for the solution of the basic soil water movement equation.A set of data about soil water suction corresponding to soil water content were observed by tensiometer method, and the soil saturated hydraulic conductivity was determined by double loop infiltration experiment in the field of Fengshou irriga tion district in Awati county of Xinjiang, respectively. A water retention equation based on a closed form equation pro posed by Van Genuchten was fitted with Sigmaplot software. The calculation formula for unsaturated hydraulic conductivi ty was established by employing the equation put forwarded by Mualem. Finally, the calculation formula for soil water diffusivity and specific water capacity were also derived indirectly.