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以英国 Hillsborough农业研究所附近的一块 7.9hm2的牧草地为研究区 ,采用地统计的半方差分析和克立格方法研究其空间变异性和空间插值。同时对研究田块的样点根据不同间距、不同形状进行删选 ,对不同布局状况下的结果进行统计比较 ,以获取满足一定精度下的最少采样个数和采样形状。研究结果表明 ,单纯利用样方统计 ,土壤有效钾需要 6 5个采样点 ,大致为原始采样点的一半。而在考虑空间采样形状和空间插值效果 ,再采用最小显著性差异 (L SD)进行比较 ,该田块土壤有效钾采样最好使用规则三角网布点 (样点数为 6 2个 )。
Taking a 7.9hm2 pastureland near Hillsborough Institute of Agriculture in the UK as a study area, the spatial variability and spatial interpolation were studied by means of semi-ANOVA and Kriging method. At the same time, the sample plots of field plots were cut out according to different pitches and different shapes, and the results under different layout conditions were statistically compared to obtain the minimum number of samples and the sample shapes that meet certain accuracy. The results show that using purely quadrat statistics, soil available potassium requires 65 sampling points, which is about half of the original sampling point. However, considering the spatial sampling shape and spatial interpolation effect, and using the least significant difference (L SD) for comparison, it is better to use the regular triangle mesh sampling (the number of sampling points is 62) in this field.