非饱和土壤水分运动与热力学函数关系初探

STUDY ON RELATIONSHIP OF WATER MOVEMENT AND THERMODYNAMIC FUNCTION IN UNSATURATED SOIL

在不同的温度条件下，研究了土壤水势对水分运动的影响。结果表明，在同一温度条件下，提高土壤水势可增加土壤非饱和导水率，呈现黄绵土＞ 土。在相同的土壤含水量条件下，增加温度可提高土壤非饱和导水率，其导水率温度效应值 土＞黄绵土。土壤含水量一定时，随着相对偏摩尔自由能变 和相对偏摩尔焓变 增大，土壤非饱和导水率也增大，并且呈现出黄绵土＞ 土，拟合得出的相对偏摩尔自由能变和相对偏摩尔焓变 与土壤非饱和导水率方程，具有较好的适应性。

Effect of water movement by soil potential under different temperature was studied. The results showed that unsaturated water transmitting rate was rising with the increasing of soil potential in case that temperature was constant, the rising value in cultivated loessial soil was larger than that in lou soil, and was rising with temperature rising in case that soil water content was constant, the value of temperature effect of unsaturated water transmitting rate ( ) in lou soil was larder than that in cultivated loessial soil. Water transmitting rate of unsaturated soil also increased with the increasing of relative partial molal free energy variation, [ ( G) ], and relative partial molal enthalpy variation, [ ( H)], in case that soil water content was constant. The increasing of water transmitting rate in cultivated loessial soil was larger than that in lou soil. The equations were regressed between [ (G)] and [ (H)] and k, they had better suitable.