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在黄土高原水蚀风蚀交错区坡面(40 m×350 m)尺度上进行网格(10 m×10 m)取样,用经典统计学和地统计学相结合研究了180个土壤剖面(0—200 cm)各土层扰动土饱和导水率(Ks)的空间异质性及分布格局。结果表明:0—20 cm土层的Ks值(5.36×10-3cm/s)最大,>20—200 cm各土层的Ks值均小于表层,其值介于4.32×10-3—4.76×10-3cm/s之间。各土层Ks的变异程度相近,均属于中等变异。>20—200 cm各土层Ks的Kriging插值图分布格局也表现出一致性,因此可用>20—40 cm土层的Ks值来代表深层Ks值对土壤水分运动进行模拟。除了0—20 cm的Ks的基台值(C+C0)为0.154,其它各土层基台值介于0.202—0.276之间,说明0—20 cm的Ks空间异质性小于>20—200 cm各土层。从比值C/(C+C0)来看,0—20 cm属于中等自相关,>20—200 cm土层属于强的空间自相关性,同样也验证了黄土高原水蚀风蚀交错区土壤剖面饱和导水率具有空间变异特征。
A grid (10 m × 10 m) sampling was performed on a 40 m × 350 m scale on the slope of water-wind erosion crisscross region in the Loess Plateau. 180 soil profiles (0-200) were studied by combining classical statistics with geo-statistics cm). Spatial heterogeneity and distribution pattern of soil saturated hydraulic conductivity (Ks) in different soil layers. The results showed that the Ks value of 0-20 cm soil layer was the highest (5.36 × 10-3 cm / s), and the Ks values of soil layers> 20-200 cm were smaller than those of the surface layer, with values of 4.32 × 10-3-4.76 × 10-3cm / s between. The degree of variation of Ks in each soil layer is similar, all belong to the medium variation. > 20-200 cm Kriging interpolation map of Ks in different soil layers also shows consistency. Therefore, Ks value of> 20-40 cm soil layer can be used to represent deep Ks value to simulate soil water movement. Except that the abutment value (C + C0) of Ks at 0-20 cm was 0.154 and that of other soil layers was between 0.202-0.276, indicating that the Ks spatial heterogeneity of 0-20 cm was less than> 20-200 cm each soil layer. From the ratio of C / (C + C0), 0-20 cm belongs to the medium autocorrelation,> 20-200 cm soil layer belongs to the strong spatial autocorrelation, and also verifies the saturation profile of the soil profile in the ecotone between water and wind erosion in the Loess Plateau Water rate has the characteristics of spatial variability.