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为给沉陷风沙区土地利用规划、治理提供理论参考,主要应用典型判别分析与因子分析对内蒙古鄂尔多斯市毛乌素沙地南缘补连塔矿区沉陷于2004、2005年的2个沉陷区沉陷2～3a后的土壤质量进行了分析。结果表明,2个沉陷区的土壤含水率、硬度、全氮与全磷显著低于对照区(p<0.05);部分沉陷区内地表扰动严重的坡位体积质量显著降低(p<0.05),孔隙度显著升高(p<0.05);各沉陷区全钾与有机质无显著变化(p>0.05),速效养分整体上有活化趋势。由典型判别分析得到一个主要反映土壤养分扰动程度的判别函数,可将对照区与2004、2005年沉陷区样点分别划分入无影响、有影响与严重影响3个等级。通过因子分析将11个土壤指标概括为5个意义明显的综合因子,并以雷达图与散点图形式对沉陷区样点各综合土壤质量因子得分进行了直观表达。
In order to provide theoretical reference for land use planning and harnessing in subsidence area, typical discriminant analysis and factor analysis are used to analyze the subsidence of BuLianTa mining area in the south margin of MuUsu Sands in Erdos, Inner Mongolia in 2 subsidence subsidence areas in 2004 and 2005 After the soil quality was analyzed. The results showed that the soil moisture content, hardness, total nitrogen and total phosphorus in the two subsidence areas were significantly lower than those in the control area (p <0.05). The subsidence area showed significant disturbance (p <0.05) (P <0.05). There was no significant change in total potassium and organic matter in all the subsidence areas (p> 0.05). The available nutrient had an overall trend of activation. By discriminant analysis, a discriminant function that mainly reflects the degree of soil nutrient disturbance can be obtained. It can distinguish the control area from the sample areas of subsidence areas in 2004 and 2005 without impact, and influence and seriously affect three levels. Eleven soil indices were summarized as five significant comprehensive factors by factor analysis, and the scores of comprehensive soil quality factors in subsidence area were visualized by radar chart and scatter plot.