温度梯度对非饱和土壤水分运动的影响

Effect of Temperature Gradient on Unsaturated Soil Water Transport

在土壤不同含水量条件下，研究了温度梯度对非饱和土壤水分运动的影响，结果表明：在同一含水量条件下，增温可提高土壤水势，呈现黄泥巴＞土＞黑垆土的顺序；在同一含水量条件下，３种土壤在低温区及高温区均随温度梯度增加，土壤水分通量和导水率增大，但土壤导水率随温度梯度变化幅度小于土壤水分通量；温度梯度和含水量相同时，高温区土壤水分通量和导水率大于低温区；土壤水分通量及导水率呈现黑垆土＞土＞黄泥巴的顺序。同一土壤随含水量增大，土壤水分通量和导水率增加。

This paper deals with the effect of temperature gradient on unsaturatedsoil water transport.The results showed that water potential was improved with an in-crease in temperature under the same conditions of water contents,appearing to be inthe following orders:Yellow cinamon soil>Lou soil>Black lou soil.Under the same wa-ter contents of three kinds of soils in the low temperature zone and the high temperaturezone,soil water flux and soil hydraulic conductivity increased with temperatur rising,but soil hydraulic conductivity was smaller than water flux with a variation in water gra-dient:Water flux and hydraulic conductivity in the zone of high temperature vvere greaterthan those in the zone of low temperature when the temperature gradient and water con-tents were the same. Water flux and hydraulic conductivity of soils appeared to be in thefollowing orders:Black lou soil>bou soil>Yellow cinnamon soil.Water flux and hy-draulic conductivity increased with an increase in water contents.