【摘要】 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。更多还原

【Abstract】 Geostatistical methods were used in combination of GIS technology to analyze the spatial distribution characteristics of available calcium, available magnesium and available sulphur in Xiangcheng tobacco planting fields, Henan province. The results indicated that data of each variable fitted normal distribution after log transformation. Analysis of the isotropic variogram indicated that the soil available calcium, available magnesium and available sulphur semivariogram were well described with Gaussian, spherical and exponential models. And that the contents of available sulphur was moderately spatially dependent in a given spatial range with the ratio of nugget to sill being 0.598, while the contents of available calcium and available magnesium were strongly spatially dependent with the ratio of nugget to sill being 0.116 and 0.231 respectively. The ranges of spatially dependent for available calcium, available magnesium and available sulphur were 22759.15, 15490.0 and 27860.69 m respectively. With the kriging analysis, the results showed that the soils with the higher contents of available calcium and available magnesium were found in the nort heast of investigated region, while the contents of available sulphur were decreased from west to east.更多还原