论文部分内容阅读
本研究基于土壤水分动力学分析方法与热力学方法相结合,探讨了温度梯度对土壤水分运动过程的影响机理。通过在室内人为设定和控制不同实验温度条件,模拟了温度梯度下供试土壤水分运动过程。结果表明:温度梯度的存在对土壤水分运动过程有着显著影响。在土壤水分入渗过程中,温度势对土壤水分运动的影响表现为:当温度势与基质势协同时,温度势表现为促进土壤水分运动,当温度势与基质势拮抗时,温度势表现为阻碍土壤水分运动;在均湿土壤中,温度势对土壤水分运动的影响表现的更为显著,且在温度梯度存在的情况下,土壤水分由热端向冷端运动。
In this study, based on the method of soil moisture dynamics and thermodynamics, the mechanism of temperature gradient on soil moisture movement was discussed. Through artificial setting and controlling of different experimental temperature conditions indoors, the soil water movement process under simulated temperature gradient was simulated. The results show that the existence of temperature gradient has a significant effect on the process of soil moisture movement. The effects of temperature on soil water movement during soil water infiltration are as follows: When the temperature potential is synergistic with the matrix potential, the temperature potential appears to promote soil water movement. When the temperature potential is antagonistic to the matrix potential, the temperature potential is Which hinders soil water movement. In wet soil, the effect of temperature potential on soil water movement is more significant, and under the condition of temperature gradient, soil moisture moves from hot end to cold end.