绿洲棉田非饱和土壤导水率的野外试验研究

 非饱和土壤导水率是研究土壤水盐运动的重要参数之一,其测定方法很多。根据Libardi等人提出的野外测定非饱和土壤导水率的θ法,通过在阿克苏水平衡试验站棉田的试验,求得了该站绿洲棉田的非饱和土壤导水率,建立了计算非饱和土壤导水率的经验公式,将θ法与毛细管模型确定的非饱和土壤导水率与土壤含水率的关系进行了比较,并分析了θ法的误差来源。研究结果表明:θ法简单实用,是一种野外测定非层状土壤非饱和导水率的行之有效方法。

Field Experimental Study on Unsaturated Soil Hydraulic Conductivity in Oasis Cotton Field

The unsaturated soil hydraulic conductivity is one of the essential parameters to study soil water and salt movement. There are a variety of methods to determine it. Using "θ" method developed by P.L. Libardi et al.,the unsaturated soil hydraulic conductivity was obtained in oasis cotton field in AKS water balance experimental station of Xinjiang,and empirical formula of calculating unsaturated soil hydraulic conductivity were established. The relationship between unsaturated soil hydraulic conductivity and soil moisture content with "θ" method and capillary bundle model was further compared. Based on that,the error resources of "θ" method were analyzed. It is found that "θ" method is simple but effective for determining unsaturated soil hydraulic conductivity.