绿洲地带非均质土层分界面处土壤水分布特征

在研究沙漠边缘绿洲地带水分运移的过程中，发现了包气带非均质土层界面处，土壤水分布不连续性的特征。其原因是土壤水运动是在相应的基质势梯度作用下发生的，而并不需要对应的含水量梯度。这在研究田间含水量的植物根区的土壤水流、降雨入渗和灌溉水入渗补给地下水和河渠水入渗补给地下水机理领域中均具有重要意义。在实际工作中，必须区分饱和状态与饱和状态水流运动特征，否则会造成不应有的误解和错误。

The Characteristics of Soil Water Distribution at the Boundary Surface of Inhomogeneous Zone

In studying the soil water movement in the oasis zone wong the margin of the desert, we have found that the moisture distribution is discontinuous at the boundary surface of unsaturated zone as well as inhomogeneous zone. The reason is that it is under the effect of matrix potential gradient in stead of moisture content gradient.This principle is of great significance in the study of the mechanism about the moiture content of the fields, the soil water movement in the plant roat region and the supply of the pseapitation, irrigation water and stream influent to the underground water. so it is very necessary in practical work to distinguish the characteristics of currents in unsaturated or saturated condition. Otherwise, if may lead to misunderstandings or mistakes.