我国华北平原土壤质地情况比较复杂,壤土剖面中,在不同部位上往往有不同厚度的粘土层。土壤中水盐运行的情况密切受土壤质地和地下水位的影响。如土壤剖面中有粘土夹层,它将在很大程度上影响剖面中水分的分布和运行。研究粘土夹层对水分运 The soil texture in the North China Plain is rather complicated. In the loam profile, there are often different thicknesses of clay layers in different parts. The operation of water and salt in the soil is closely influenced by soil texture and groundwater level. If there is a clay interlayer in the soil profile, it will largely affect the distribution and operation of moisture in the profile. Study of clay transport on the water transport