黄土高原坡地表层土壤饱和导水率和水分含量空间变异特征

表层土壤水分含量和饱和导水率对深层土壤水分的动态的变化具有重要的决定作用。在黄土高原坡地(50m×360 m)范围内进行网格(10 m×10 m)取样,用地统计学方法研究表层(0~30 cm)土壤饱和导水率和水分含量的空间变异特征。结果表明:1)坡地表层土壤密度变化规律为坡下位大于坡上位,土壤饱和导水率变异系数为0.37,属于中等变异强度;2)饱和导水率和自然对数化的饱和导水率在360 m尺度内均不具备空间结构特征,是纯随机变量,线性有基台模型适用于描述表层土壤水分的分布特征,水分分布存在明显的块金效应,并且随滞后距离的增加半方差变大;3)饱和导水率和水分含量从坡上位到坡下位均呈现波浪式变化,饱和导水率大的采样点土壤水分含量低,反之则高。

A geo-statistical method was used to study the spatial variability of a soil surface layer(0-30 cm),for analysis of the spatial patterns of saturated hydraulic conductivity and soil water,on a slope(50 m×360 m) of the Loess Plateau,using a grid sampling method(10 m×10 m space).Results indicated that bulk density of the layer is higher at the bottom than that at the top.The variation coefficient of the soil saturated hydraulic conductivity is 0.37,which belongs to the middle variation degree.Saturated hydrau...