基于GIS的黄土丘陵区土壤水库库容组成及其定量分析--以陕北安塞县为例

Makeup of Soil Water Reservoir and Its Quantitative Analysis in the Loess Hilly Region——A Case Study of Ansai County,Shaanxi Province

以空间图形和数据库为基础,对土壤水库的相关技术指标、研究深度和静态库容组成等进行了描述、界定和计算。研究认为:安塞县5m深土层土壤水库总库容为1419.78mm/416156万m3,其中死库容占土壤总库容的21.08%,重力库容占土壤总库容的13.82%,有效库容占土壤总库容的65.10%,最大有效库容占总库容的78.92%;从土地利用类型方面来看,坡耕地和荒坡地总库容量最大,分别占研究区土壤水库总库容的37.65%和36.04%;从坡度分级方面来看,>25°和10°～15°坡度级别土壤总库容量最大,分别占研究区土壤水库总库容的41.50%和30.52%;峁坡和沟坡土壤水库库容组成基本相等。

This paper expatiated on define,function and correlative technique index of soil water reservoir,made certain its research depth,and calculated static state capacity of soil water reservoir.The results showed：In 5 m depth soil of research area,total holding capacity is 1 419.78 mm/416.156 million m3.Unavailable volumetric capacity is 21.08% of total holding capacity.Gravitational volumetric capacity is 13.82% of total holding capacity.Available volumetric capacity is 65.10% of total holding capacity.The greatest available volumetric capacity is 78.92% of total holding capacity.