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以贵州省典型的喀斯特地区———毕节地区为研究区域,利用地统计学和GIS相结合的方法,对烟田土壤肥力进行综合评价。在确定评价因子隶属函数和权重的基础上,建立土壤肥力综合评价指标(IFI)。通过对土壤肥力综合评价指标进行半方差函数分析和普通克里格法(Kriging)最优内插,绘制了毕节地区烟田土壤肥力综合评价指标的空间分布图。描述性统计结果表明,毕节地区烟田土壤肥力综合评价指标值为0.35～0.92,变异系数为14.25%。半方差函数分析表明,毕节地区烟田土壤肥力综合评价指数的最适模型是指数模型;块基比为30%,表明具有中度空间相关性;烟田土壤肥力综合评价指数在空间分布上总体呈从内到外递减的趋势,其中以0.63～0.72和0.72～0.92范围内的面积较大,分别占到总面积的68.20%和20.63%。由此表明,该研究区域大部分土壤肥力状况良好。
Taking Bijie Prefecture, a typical karst area in Guizhou Province, as the research area, the soil fertility of tobacco field was evaluated comprehensively by using the method of geostatistics and GIS. On the basis of determining membership functions and weights of evaluation factors, a comprehensive assessment index (IFI) of soil fertility was established. Through the semi-variance function analysis and Kriging optimal interpolation, the spatial distribution map of soil fertility comprehensive evaluation index of tobacco field in Bijie was drawn. Descriptive statistics showed that the comprehensive evaluation index of soil fertility in Bijie was 0.35-0.92, and the coefficient of variation was 14.25%. The analysis of the semi-variance function showed that the optimum model for comprehensive evaluation index of tobacco soil fertility in Bijie was exponential model; the ratio of base to base was 30%, indicating moderate spatial correlation; the overall index of soil fertility comprehensive evaluation in tobacco field was Which showed a trend of decreasing from the inside to the outside. Among them, the areas were 0.63 ~ 0.72 and 0.72 ~ 0.92, accounting for 68.20% and 20.63% of the total area, respectively. As a result, most of the soil fertility was good in the study area.