【摘要】 文中分析了河套平原不同表层土壤的元素含量,并运用统计学方法探讨了河套平原表层土壤元素的组成和空间变化。结果表明:河套地区土壤Al、Fe等元素与Na、Sr化学活动性元素的特征差异较大;而重金属元素Cu、Mn、Pb、Zn等元素存在异常,变异系数较大,明显受人类活动的影响,可作为人类工业活动的指标。表层土壤元素的空间变异特征表明,Ca、Mg等稳定元素存在明显的空间相关性,反映了土壤母质对元素含量影响较大;P元素的理论模型为线性,与河套地区大面积农田使用磷肥过量有关;重金属元素为中等强度的空间相关性,表明受到工农业生产等小尺度因素的影响。河套平原地区重金属元素空间分布总体呈现北部和南部地区较高,且北高南低,东西向变化不明显的特征,这与当地的工业开矿、城市化发展以及工农业的生产等人类活动密切相关。更多还原

【Abstract】 This paper analyzes the element contents in different topsoil and with the methods of statistics inquired into the element contents and its spatial characteristics in Hetao plain. The results show that the element contents( Al and Fe) of Hetao have significant differences with active elements( Na and Sr),but the heavy metal elements( Cu,Mn,Pb,Zn) display abnormally and variable coefficient is larger,which shows heavily influenced by human activities and acts as the indicator of human industrial activities. Spatial distribution of the elements in topsoil shows that the stable elements( Ca,Mg) in the topsoil have a strong spatial autocorrelation,which reflects that the soil parent material have a great effect on element contents; theoretical model of the element P is linear,this result has something to do with using excess P fertilization in much farmland; heavy metal elements in the topsoil have a medium spatial autocorrelation,which subjects to the small scale factors such as industrial and agricultural production. In Hetao plain,the spatial characteristics of heavy metal element contents show that the northern and southern area are relatively high,and northern area exceeds the southern area,the change from the western to eastern area is not obvious,this phenomenon is closely related to human activities such as local industrial mining,urbanization development,industrial and agricultural production and so on.更多还原