论文部分内容阅读
以地统计学和GIS相结合,以山东费县为例探讨了土壤有机质、全氮、碱解氮、有效磷和速效钾5种养分空间变异特征及县域尺度土壤养分的合理采样数。研究表明,有效磷的变异系数最大,由大到小依次为有效磷>速效钾>有机质>碱解氮>全氮。有机质、全氮、速效钾3种养分呈现中等强度的空间相关性且变程较大,基于土壤养分的空间相关性和克里格插值的独立验证得出费县有机质、全氮和速效钾3种养分合理采样数分别为1 035、842和1 033个,合理采样间距约为1 352、1 500和1 354 m。碱解氮不存在空间相关性,后续采样需要加大采样密度进一步研究其空间结构性。而有效磷呈现很强的空间相关性,但是变程很小,小范围内受人类活动等随机性因素较大,后续采样不能低于目前采样密度。
Based on the combination of geostatistics and GIS, taking the Feixian County of Shandong Province as an example, the spatial variability of soil organic matter, total nitrogen, available nitrogen, available phosphorus and available potassium and the reasonable sampling number of soil nutrients at the county scale were discussed. The results showed that the coefficient of variation of available phosphorus was the largest, followed by available phosphorus> available potassium> organic matter> available nitrogen> total nitrogen. The three nutrients of organic matter, total nitrogen and available potassium showed moderate intensity spatial correlation and large variation range. Based on the spatial correlation of soil nutrients and independent verification of Kriging interpolation, the yield of organic matter, total nitrogen and available potassium The reasonable sampling numbers of the three nutrients were 1 035,842 and 1 033, respectively, and the reasonable sampling intervals were about 1 352,1 500 and 1 354 m. There is no spatial correlation between nitrogen and nitrogen, and subsequent sampling needs to increase the sampling density to further study its spatial structure. However, the available P showed a strong spatial correlation, but the range was small. The random factors such as human activities were small in a small area, and the follow-up sampling could not be less than the current sampling density.