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为了解烟草试验站土壤理化特性的空间变异情况进而为大田试验布局提供依据,本研究在地统计学和GIS的支持下,以半方差函数为基本工具,分析了彭水试验站的耕层土壤养分的空间变异特征,并运用普通克里格(Kriging)进行最优无偏线性插值,制作了土壤养分的空间分布图。结果表明,试验站内磷钾素含量较高,氮素含量较低,且各种养分的差异性均较大,土壤呈酸性。所有土壤属性均可用球状和指数模型进行较好拟合,且具有较大的空间变异性。土壤p H、阳离子交换量、全磷和速效磷受结构因素影响较大,其余各土壤属性的空间相关性由结构性因素和人为因素共同决定。采用克立格方法进行最优内插,绘制了各种养分含量的空间分布图,为大田试验的布置提供依据。
In order to understand the spatial variability of the soil physical and chemical properties in tobacco experimental stations and provide the basis for the field experiment layout, this study, with the support of geostatistics and GIS, based on the semi-variance function as the basic tool, analyzed the topsoil The spatial variability of nutrients was analyzed and Kriging was used for optimal non-linear interpolation. Spatial distribution of soil nutrients was made. The results showed that the content of P and K was high and the content of nitrogen was lower in experimental station, and the differences of various nutrients were larger and the soil was acidic. All the soil properties can be well fitted by the spherical and exponential model, and have larger spatial variability. Soil p H, cation exchange capacity, total phosphorus and available phosphorus were more affected by structural factors. The spatial correlation of other soil properties was determined by both structural and anthropogenic factors. Using Kriging method for optimal interpolation, the spatial distribution map of various nutrient contents was drawn, which provided the basis for the field experiment arrangement.