| 摘要: |
| 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。 |
| 关键词: 温度梯度，导水率，水分通量 |
| DOI： |
| 分类号:S152.7 |
| 基金项目:国家自然科学基金资助课题 |
|
| Effect of Temperature Gradient on Unsaturated Soil Water Transport |
|
Liu Shichun Bai Jingling Zhang Yiping Zhang Junchang
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| Abstract: |
| This paper deals with the effect of temperature gradient on unsaturated soil water transport.The results showed that water potential was improved with an increase in temperature under the same conditions of water contents,appearing to be in the following orders:Yellow cinamon soil>Lou soil>Black lou soil.Under the same water contents of three kinds of soils in the low temperature zone and the high temperature zone,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 gradient:Water flux and hydraulic conductivity in the zone of high temperature were greater than those in the zone of low temperature when the temperature gradient and water contents were the same. Water flux and hydraulic conductivity of soils appeared to be in the following orders:Black lou soil>bou soil>Yellow cinnamon soil.Water flux and hydraulic conductivity increased with an increase in water contents. |
| Key words: Temperature gradient,hydraulic conductivity,water flux |
