宁德市耕地土壤交换性钙镁数据空间分布特征及影响因素分析

摘要

In this study,the spatial distribution characteristics and influencing factors of exchangeable calcium and magnesium data of cultivated land in Ningde City were analyzed by using 4 416 soil testing results of fertilizer recommendation project in Ningde.The results show that the exchangeable calcium and magnesium contents of cultivated land in Ningde were generally of medium low level,and the cal-cium magnesium ratio was generally of suitable high level.The content of exchangeable calcium and magnesium and calcium magnesium ratio were of medium variation,strong variation,strong variation,respectively.The proportions of calcium-rich cultivated land,magnesium-rick cultivated land and the cultivated land of suitable calcium magnesium ratio were 4.49％,8.58％and 63.04％,respectively.The calcium-lack and magnesium-lack proportions in the cultivated land of suitable calcium magnesium ratio were 63.52％and 57.37％,respectively.The spatial distribution maps of soil calcium,magnesi-um content and calcium magnesium ratio of cultivated land in Ningde were drawn by sequential Gauss simulation which could be better reflected than Kriging interpolation.Except that the difference of ex-changeable magnesium content by soil type grouping was not significant,the differences of the soil ex-changeable calcium and magnesium content by the other influencing factors grouping were extremely significant(or significant).The differences of calcium magnesium ratio by type of cultivated land use,landforms,and soil organic matter content grouping were extremely significant.%利用宁德市各地测土配方施肥项目4 416个取土化验结果,分析了宁德耕地土壤交换性钙镁数据空间分布特征及影响因素.结果表明:宁德耕地土壤交换性钙、镁含量总体均属中等偏低水平,钙镁比总体属适宜偏高水平;交换性钙、镁含量和钙镁比分别为中等变异、强变异、强变异;富钙、富镁、钙镁比适宜的耕地分别占4.49％、8.58％、63.04％;钙镁比适宜的耕地中缺钙、缺镁比重仍分别高达63.52％、57.37％.采用序贯高斯模拟绘制的宁德耕地土壤钙、镁含量和钙镁比空间分布图,较克里格插值,能更好地反映数据的分布情况.除土壤类型分组的交换性镁含量差异不显著外,其他影响因素分组的土壤交换性钙、镁含量差异均极显著(或显著);耕地利用类型、地貌、土壤有机质含量分组钙镁比差异极显著.