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为了解土壤的地域差异性,基于地统计学半方差函数理论和GIS空间克立格插值定量分析了安徽省舒城县龙潭小流域有机质、全磷的各向同性、各向异性变异特征及分布格局.结果表明,有机质、全磷的半方差拟合模型均为指数模型,两者的分布都显示了强烈的空间自相关,自相关距离分别为642 m、435 m.有机质、全磷变异的各向异性都比较显著,有机质在0°、50°方向上变异程度明显大于90°、145°方向;全磷则在0°、145°方向的变异程度更加突出.有机质、全磷的分布呈明显的块状和带状,其中有机质中部含量高,南部、西部含量低;全磷则是南部、西北含量高,西部、东北含量低.
In order to understand the regional difference of soil, the isotropic and anisotropic variation characteristics and distribution of organic matter and total phosphorus in Longtan small watershed of Shucheng County, Anhui Province were quantitatively analyzed based on geostatistical semi-variance function theory and GIS spatial Kriging interpolation The results showed that the semi-variance fitting models of organic matter and total phosphorus were exponential models, and the distribution of the two models showed strong spatial autocorrelation with the autocorrelation distances of 642 m and 435 m, respectively. The anisotropy of the organic matter is more significant, the degree of variation of organic matter in 0 ° and 50 ° direction is obviously greater than that of 90 ° and 145 °, and the variation degree of total phosphorus in 0 ° and 145 ° direction is more prominent. Significantly massive and banded, of which the middle organic matter content is high, low in the south and west; total phosphorus is the south, high in the northwest, low in the west and northeast.