Spatial heterogeneity of soil water in typical terracing and sloping field in Karst

Selected terracing and sloping fields as study object in the typical karst area at Guohua demonstration area, used geostatistics and GIS technology to research the spatial distribution of soil moisture content, pre-meshed points in the laboratory, and collected soil samples in the experimental zone, then tested soil moisture content in the laboratory. The results showed that in the two experimental zones, the spatial distribution of soil moisture content was a certain degree of high degree positive correlation; space gathering area and space isolated area showed a similar high - high agglomeration and low - low agglomeration characteristics obviously, and isolated areas scattered; the spatial distribution of soil water content all accorded with the spherical model, soil moisture content was affected by the condition greatly in the sloping fields; in the terracing, the land was consolidated, soil moisture was mainly affected by the combined effects of terrain conditions and human factors; the minimum spatial Variable-range was about 90 m in the sloping fields, and 135 m in the terracing, the distance ould be emplaced as the sampling point interval basis at different types of sloping fields. The research has important theoretical significance and reference value for agricultural production and sustainable use of soil resources.