The reason is that it is under the effect of matrix potential gradient in stead of moisture content gradient.
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。
Sometime the matrix potential of soil water, moisture capacity and the total content of salt capacity in the soil have the same trends of change with depth.
在包气带剖面中，在某时刻水土势、含水量、含盐量随深度变化的趋势相同。
Sometime the matrix potential of soil water, moisture capacity and the total content of salt capacity in the soil have the same trends of change with depth.
在包气带剖面中，在某时刻水土势、含水量、含盐量随深度变化的趋势相同。
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