温度效应对非饱和土壤中湿分迁移影响的实验

在多种条件下,对非饱和多孔土壤中温度和湿分分布的动态特性进行了实验研究,分析了温度效应对水分运移的影响.结果表明:温度对土壤水分含量的影响显著,随着温度升高,土壤持水性降低,水分含量明显降低;在周期性变化的土壤温度的作用下,土壤水分含量则呈周期性变化;土壤润湿度与温度变化幅度共同决定温度效应对土壤湿分迁移的影响程度,由温度和温度梯度引起的湿分迁移在含水量中等程度的土壤中作用明显.

Experimental studies on the influences of temperature on moisture transport in unsaturated porous soil

Under different conditions, the variations of soil temperature and water content were observed and the influence of temperature effect on moisture transfer in unsaturated porous soil was analyzed. The experimental results were: a. Influences of temperature on the variations of soil moisture content is obvious and with temperature growing soil water capacity reduces. Water content decreases with the increase of soil temperature and increased with the decrease of soil temperature; b. The influence degree of temperature effect depends both on temperature variation fluctuation and on soil moisture content. In shallow layer with low water content, the effect of temperature on moisture content was weak. In contrast, temperature effect was fairly obvious in deeper layer with relatively higher water content.