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采用GIS和地统计学中的普通克里格插值(Ordinary Kriging)和序贯高斯模拟方法(SGSV单次实现和SGSA平均实现)对河南省封丘县土壤速效钾的空间变异特征进行了分析研究。结果表明,Kringing插值具有明显的平滑效应;SGSV模拟与实测数据具有相似的空间自相关结构,既尊重了实测数据,又可以再现区域化变量的空间波动性;SGSA在一定程度上能够消除平滑效应的影响,同时还能兼顾实测数据的结构性特征。因此,SGSA模拟在土壤速效钾空间结构的研究中,能够达到更好的效果。
The spatial variability of soil available potassium in Fengqiu County, Henan Province, was studied using Ordinary Kriging and sequential Gaussian simulations in GIS and geostatistics (SGSV and SGSA) . The results show that the Kringing interpolation has obvious smoothing effect. The SGSV simulation and the measured data have similar spatial autocorrelation structures, which not only respect the measured data but also reproduce the spatial variability of the regionalized variables. SGSA can eliminate the smoothing effect to a certain extent While taking into account the structural characteristics of the measured data. Therefore, SGSA simulation can achieve better results in the study of the spatial structure of available K in soil.