The thesis studies the theories of water vapor transfer in unsaturated soil, and gets the water contents equations of water vapor transfer in unsaturated soils.

本论文进行了非饱和土气态水迁移的理论研究，得到非饱和土中气态水迁移引起的含水量变化方程。

youdao

Usually there is two forms of water transfer which is water vapor transfer and liquid water transfer in unsaturated soil.

非饱和土中水分迁移通常有液态水和气态水迁移两种形式。

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In the tropics, they take up water from the deep soil and release it as vapor in the air.

FORBES: Govindasamy Bala