土壤水分热力学函数研究

A Study on the Thermodynamic Functions of Soil Water

研究了几种土壤在不同含水量条件下土壤水分热力学函数(相对偏摩尔自由能△G,相对偏摩尔焓△H,相对偏摩尔熵△S)的结果表明;在不同含水量和温度条件下,供试样品各土壤水分热力学函数均为负值,且随水分含量增加绝对值趋于减小。温度与土壤水△分G呈显著正相关。吉布斯—亥姆霍茨方程在实验温度范围内适用于土壤水分△G的计算。在相同含水量条件下,供试样品土壤水分的△G,△H和△S值,均是黑垆土、垆土>红油土,并呈规律性变化。

The thermodynamic functions of soil water (relative partial molar free energy C, enthalpy H and entropy S were studied under different water contents in several soils. The results showed that all of the thermodynamic functions (C,H and S) of soil water in soil samples used were negative values under different water contents and temperatures, and the absolute values tended to reduce with water content increase. Temperature was in extremely positive correlation with C of soil water,Gibbs Helmboltz equation is also applicable to the calculation of d?of soil water within the limits of the experimental temperature. Under the same water content, all of the C, H and S values in soil samples used were as follows .Heilu soil, Lutu soil Hongyou soil and also appeared to have a regular change.