黔南喀斯特地区植烟土壤有效态中微量元素空间变异及影响因子——以黔南山区为例

摘要

Spatial variability and impact factors of available medium and trace elements in Qiannan Karst tobacco soil were analyzed using geostatistics.Results indicated that the variability coefficients of exchangeable calcium (ECa),available copper (ACu) and available zinc (AZn) were in moderate intensity,and exchangeable magnesium(EMg) was in strong intensity.Semivariogram models of ECa,EMg,ACu and Azn were described as exponential models.Spatial autocorrelation of EMg,ACu and AZn were in moderate intensity,and ECa was in weak intensity.In general,contents of ECa,EMg,ACu and AZn in tobacco soil were rich,and the areas with deficiency of ECa,EMg,ACu and AZn only accounted for 1.22％,0.46％,0.21％ and 0.25％ of total study area,respectively.Soil type and pH were key environmental factors that influenced tobacco soil available secondary and trace elements in Qiannan prefecture.%为揭示喀斯特山地植烟土壤中微量元素空间变异特征及影响因素,利用地统计学对黔南喀斯特山地植烟土壤有效态钙、镁、铜、锌等元素进行空间变异和影响因子分析.结果表明,黔南植烟土壤交换性钙、有效铜和有效锌属中等强度变异,交换性镁属强变异.交换性钙、交换性镁、有效铜和有效锌的半方差函数均为指数模型.交换性镁、有效铜和有效锌具有中等的空间相关性,交换性钙空间相关性较弱.黔南州植烟土壤交换性钙、交换性镁、有效铜和有效锌总体含量较为丰富,土壤交换性钙、交换性镁、有效铜和有效锌缺乏的面积分别只占统计面积的1.22％、0.46％、0.21％和0.25％.土壤类型和土壤pH是影响黔南植烟土壤有效态中微量元素含量的重要环境因子.