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土壤养分连续空间分布数据是土壤信息系统工作的基础,土壤养分空间插值的研究因此变得尤为重要。对湖北省鄂州市进行土壤养分采样调查,以对作物生长作用较为密切的有效氮、有效磷、有效钾、pH为研究对象,运用克里格法(Kriging)、样条函数法(Spline)、距离权重倒数法(IDW)3种插值方法对数据进行栅格化处理,分析比较3种插值方法所得结果的特性以及对耕地养分数据插值的适宜性。通过调整空间采样点密度,比较几种空间采样密度对插值结果的影响,总结3种插值方法在不同空间尺度下的插值精度,并在不同土壤类型内进行不同采样密度的插值分析。
The continuous spatial distribution of soil nutrients is the basis of soil information system. Therefore, the study of spatial interpolation of soil nutrients has become especially important. Soil samples were collected from Ezhou City of Hubei Province. The available nitrogen, available phosphorus, available potassium and pH, which are closely related to crop growth, were studied by Kriging, Spline, The data were rasterized by three interpolation methods, weight reciprocal method (IDW), the characteristics of the results obtained by the three interpolation methods were analyzed and compared, and the suitability of interpolating the cropland nutrient data was analyzed. By adjusting the density of spatial sampling points, the effects of several spatial sampling densities on the interpolation results were compared. The interpolation accuracy of the three interpolation methods at different spatial scales was summarized and the interpolation analysis of different sampling densities was carried out in different soil types.