祁连山林区土壤水分与降水的关系分析

对祁连山林区森林和阳坡草地的土壤水分特点及其与降水的关系进行分析.表明祁连山林区不同地类的土壤水分季节变化规律基本一致,主要受降水量及其分配的影响.一般年份5月以前为土壤干季,6月土壤湿季开始;但在偏旱年份,表现为土壤湿季在前、干季在后.土壤水分垂直变化的差异表现为,林地土壤水分上部大于下部;绝大多数年份,土壤水分随深度的增加而减少.不同水文年土壤水分的年循环水平及生长期末的贮水量与降水量有关,以土壤贮水量与降水量的关系最为明显.

Analysis on Relation of Soil Water and Precipitation of Forest Area in Qilian Mountains

Based on the field measured data of location station, the relationship between soil water of forest and grazing areas in Qilian Mountains was analyzed.The results were as follows: The seasonal change of soil water characteristics was the same in different land,and controlled mainly by precipitation and its distribution. Generally speaking the period before June was soil dry season; July to October was soil wet season. But in the dry year opposite result occurred. Compared with uncultivated land, the profile change of soil water in plantations shows that soil water content in surface layer is higher than that in middle layer and in under layer. The correlations between the cycle levels of soil water, stored soil water at the end of growing season were significant. The both consumption and compensation of soil water also were controlled by precipitation and its distribution.