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在地统计学和GIS的支持下,以半方差函数为基本工具,分析了苏南典型地区耕层土壤颗粒的空间变异特征,并运用块段普通克立格法(BlockKriging)进行最优无偏线性插值,制作了不同粒径土壤颗粒的空间分布图。结果表明,研究区域不同粒径土壤颗粒在较大的范围内存在着空间相关性,砂粒和粉砂的空间相关距离达到243km,粘粒也达到81km;不同粒径土壤颗粒由结构性因素引起的空间变异性达到70%以上,反映了土壤颗粒在研究区域内具有较强的空间自相关性。Kriging插值结果更直观地反映了研究区域土壤颗粒的空间变异特征。
With the support of geostatistics and GIS, using the semi-variance function as the basic tool, the spatial variation characteristics of topsoil particle in the typical area of southern Jiangsu Province was analyzed. BlockKriging Linear interpolation, the production of different particle size soil particle spatial distribution map. The results show that there is a spatial correlation between soil particles of different particle sizes in the study area, the spatial correlation distance between sand and silt reaches 243km, and the clay reaches 81km. The soil particles with different particle sizes are caused by structural factors Spatial variability of more than 70%, reflecting the soil particles in the study area has strong spatial autocorrelation. Kriging interpolation results more intuitively reflect the spatial variability of soil particles in the study area.