贵州省植烟区土壤pH值和养分空间变异特征的研究

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

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。

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.