黄土高原荒坡与林地土壤水分变化规律研究

为探讨黄土高原有、无林地土壤水分全年变化规律之异同，在黄土高原半湿润区，采用中子水分测定仪定位测定方法，对无林沟坡（荒坡）与林地土壤水分储量变化进行了连续３年的定点测定，结果表明，在０－３２０ｃｍ的测定深度内，阴坡上、下部与阳坡下部荒坡土壤储水增量分别为－１６５．７ｍｍ、－１１５．２ｍｍ和－７４．９ｍｍ；阴坡上部的油松林地，在０－３２０ｃｍ深度内，林地却在林木每年蒸腾消耗大量水分（达３８０ｍｍ以上

Soil moisture dynamics in forest land and wasteland of Loess Plateau

The dynamics of soil moisture stored in a wasteland and in a forest land in the sub-humid climate region of the Loess Plateau was measured with neutron moisture meter for three successive years. Within the depth of 0-320 cm, the increment of soil water in the test 3 years was respectively -165.7 mm, -15.2 mm and -115.2 mm at the upper and lower position on north slopes and the lower position on south slope of the wasteland. Soil water increased by 17.2 mm at the upper position on north slope of the Chinese pine forest land, after > 380 mm water was consumed yearly by tree transpiration. It is suggested that forest land is essentially different from wasteland in soil water income/expense. The necessity of conducting the approaches for gaining available water of forest land was put forward.