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对宜川黄土丘陵区的空矿地、油松林地和采伐地３类不同地表植被土壤水分在旱季和雨季 的变化情况进行研究，结果表明雨季虽然降雨量大，但蒸散量也大，土壤水分入渗率低，和旱季相 比除地在外雨季普遍偏低，空矿地表现得尤为明显。经过旱季土壤水分除地表土壤水分外二者之 间差距明显缩小，旱季土壤分入渗率提高，油松林地表土壤水分旱季降低较少。图６。
The changes of soil moisture in dry land and rainy season in three different types of surface vegetation, including empty mining land, pine forest land and logging land in loess hilly region, were studied. The results showed that although the precipitation was heavy during the rainy season, the evapotranspiration was also large, and the soil moisture Infiltration rate is low, compared with the dry season, the rainy season is generally lower than the outside, the performance of empty land is particularly evident. After the dry season soil moisture in addition to surface soil moisture difference between the two significantly reduced the dry season soil infiltration rate increased, the surface soil moisture in the pine forest to reduce less in the dry season. Figure 6.