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运用地统计学与GIS技术相结合的方法研究了河南省中部襄城植烟田土壤的有效性Ca,有效性Mg和有效性S三种中量元素含量的空间分布特征。结果表明,各变量经对数转换后符合正态分布。它们的理论模型分别符合高斯模型、球状模型和指数模型,有效性Ca和有效性Mg具有强空间相关性(Nugget与Sill的比值分别为0.116和0.231),而有效性S具有中等强度的空间相关性(Nugget与Sill的比值为0.598)。三种中量元素的空间自相关距离分别为22759.15、15490.0和27860.6m,分维数分别为1.778、1.853和1.923。Kriging插值结果显示,襄城植烟田土壤中有效性Ca和有效性Mg含量的最高值都分布在研究区的东南部,低值区都分布在研究区的中部和西部一带。而有效性S含量则呈从西向东呈逐渐减少的趋势。文章最后提出了改良石灰性土壤、增施硫酸钾等具体措施。
By using the method of geostatistics and GIS technology, the spatial distribution characteristics of soil available Ca, available Mg and available S content in Xiangcheng tobacco growing area of central Henan Province were studied. The results show that all variables logarithmically normalized. Their theoretical models fit the Gaussian model, the spherical model and the exponential model, respectively. The effective Ca and the effective Mg have a strong spatial correlation (the ratio of Nugget to Sill is 0.116 and 0.231, respectively), whereas the validity S has a moderate intensity of spatial correlation Sex (Nugget to Sill ratio is 0.598). The spatial autocorrelation distances of the three medium-sized elements are 22759.15, 15490.0 and 27860.6m, respectively, and the fractal dimensions are 1.778, 1.853 and 1.923 respectively. The results of Kriging interpolation show that the highest values of available Ca and available Mg in soil of Xiangcheng tobacco growing area are all located in the southeast of the study area, and the low value areas are all distributed in the middle and west of the study area. While the effective S content showed a decreasing trend from west to east. Finally, the paper proposes some concrete measures such as improving calcareous soil and increasing potassium sulphate.