不同含盐土壤圆盘入渗特征试验

不同含盐土壤水分入渗特征是获得准确的土壤水力参数的基础。该文通过圆盘入渗试验，分析了4种土壤在5个（-1、-3、-6、-9和-12 cm）负水头下的入渗特征。结果表明，随着水头的减小，4种土壤的吸湿率线性减小，稳定入渗率和非饱和导水率呈不同程度减小。随土壤含盐量增加稳定入渗率和导水率呈增大规律。根据实测资料确定了不同负水头下非饱和导水率的Gardner指数模型参数，为盐渍化土壤水力参数的确定提供理论参考。

Experimental of disk infiltration characteristics with different soil salt contents

The characteristics of soil water infiltration to different salt contents soils are the basis for accurate acquiring soil hydraulic parameters. Based on the infiltration experiments using a disc infiltrometer, the characteristics of the soil water movement under the different negative heads (-1, -3, -6, -9 and -12 cm) for 4 soils with different soil salt contents were analyzed. The results showed that with the decrease of the negative head, the parameters including the sorptivity, the steady infiltration rate, the unsaturated hydraulic conductivity and the macroscopic capillary length decreased to different extents. As the soil salt contents increased, the steady infiltration rates and unsaturated hydraulic conductivity increased. The parameters in Garder exponential model for unsaturated hydraulic conductivity was determined according to the experimental data at different negative water pressure heads, which could provide a reference for estimating hydraulic parameters of salinity soils.