黄土丘陵区不同植被群落土壤水分研究

在自然条件最为严酷的黄土高原半干旱丘陵沟壑区，土壤水分是植物生长的主要限制因子，而环境因子对土壤水分的影响是一个综合作用的过程，不同的地理区域其相关的影响差异较大，但就其某一具体地区而言存在着重点尺度和主控因子。对黄土丘陵区纸坊沟流域乔、灌、草植被群落的土壤水分进行了分析研究，结果表明:坡位、坡向、海拔是影响该区域土壤水分含量的主控因子；而植被群落也会影响到土壤水分含量的变化，但不能确定其为主控因子，并且可以说明林龄不是影响该区水分含量的因素。

Study on the Soil Water of Different Vegetation Communities in the Loess Hilly-Gully Region

In the semi-arid hilly and gully area with most severe natural conditions on the loess plateau, soil moisture is the major factor limiting the growth of plants, and environmental factor influencing on soil moisture is a comprehensive process, the effects of different geographical areas are very distincted, but to the difference in a specific area of scale, the controlling factors exist emphases. The soil moisture of vegetation communities in Zhifanggou watershed of loess hilly-gully region was analyzed. It could be known that the slope positions, aspect, altitude are the main controlling factors of soil moisture content in this area. And vegetation communities will also affect the change of soil water content, but cannot be the dominant factor. And it also can tell us that the age of forest is not the factor affecting the moisture content.