贵州省植烟区土壤pH值和养分空间变异特征的研究

应用地统计学的方法结合GIS空间分析技术,对贵州省植烟区土壤pH值和速效养分区域采集了3309个耕层(0～20cm)土壤样本进行了数据处理,并对其pH值、有机质、速效氮、速效磷和速效钾含量的空间分异特征进行了研究和探讨。结果表明,贵州省土壤养分pH值、有机质、速效氮、速效磷和速效钾半方差函数曲线的理论模型中,pH值和速效磷为球形(Spherical),有机质、速效氮和速效钾为高斯(Gaussion)。pH值、速效氮和速效磷具有强烈的空间相关性,块金值/基台值小于25%,其变化主要受结构性因子的影响;有机质空间相关性也较强,速效钾具有中等的空间相关性,块金值/基台值在25%～75%之间,其变化主要受随机性因子的影响。利用地统计学分析的方法,对贵州省烟叶种植具有重要的意义。

Spatial Variability of pH and Soil Nutrient for Planted Tobacco Leaf Area in Guizhou Province

Geostatistics combined with GIS was applied to analyze the spatial variability of soil nutrients in topsoil(0～20cm) for planted tobacco leaf region in Guizhou Province.3309 soil samples were collected to carry on the data processing.The results indicated that the semivariogram of pH and available P were best described by the Spherical model,while available N and available K were best fitted by the Gaussian mode1,and organic matter was best fitted by the Exponential model.The analysis also showed that the spatial correlation of pH,available N and available P was highly dependent,whose Nugget/Sill were less than 25%.Therefore the changes of them were affected by structural factors.Organic matter and available K were moderately dependent,whose Nugget/Sill were between 25%-75%.The changes of them were affected by random factors.The analysis would be very useful for planted tobacco leaf in guizhou Province.