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土壤饱和导水率的空间分布是流域水文模拟及溶质运移研究的先决条件。基于塔里木河干流108个剖面的土壤质地、有机质及容重等测试数据,运用4种土壤传递函数(PTFs)进行土壤饱和导水率预测与检验,分析土壤饱和导水率的空间变异性并计算合理采样数量,并通过尺度上推的方法预测流域尺度土壤水力参数的空间分布特征。结果表明:Campbell模型为4种PTFs模型中最适合本研究区的土壤传递函数。从空间分布的预测结果来看,不同层土壤饱和导水率的分布特征具有相似性,而深层土壤饱和导水率大于浅层。
Spatial distribution of soil saturated hydraulic conductivity is a prerequisite for hydrological simulation and solute transport in the basin. Based on soil texture, organic matter and bulk density data of 108 sections in the mainstream of the Tarim River, four soil transfer functions (PTFs) were used to predict and test soil saturated hydraulic conductivity. The spatial variability of soil saturated hydraulic conductivity was analyzed and calculated reasonably The number of samples and the prediction of the spatial distribution characteristics of soil hydraulic parameters in watershed scale by the scale up-push method. The results show that Campbell model is the most suitable soil transfer function in the four PTFs models. According to the prediction results of spatial distribution, the distribution characteristics of soil saturated hydraulic conductivity in different layers are similar, while the saturated hydraulic conductivity in deep soil is larger than that in shallow soil.