郑州市土壤重金属空间分布特征及其影响因素定量研究

为研究郑州市郊区土壤重金属空间分布特点及其影响因素,选取土壤性质、交通距离、城市距离等因素为自变量,各种土壤重金属含量为因变量,在GIS空间统计分析模块中应用多元回归分析,定量分析土壤重金属含量的影响因素。结果表明:研究区域土壤中Cd的空间分布大致呈自西向东逐渐降低的趋势,较高处含量在0.080 mg/kg以上;Hg分布由北向南逐渐降低,较高处含量在0.055 mg/kg以上;Pb的分布基本上为城市的西北偏高,含量在25.03 mg/kg以上;As的分布为北高南低,较高处含量在5.68 mg/kg以上;Cr的空间分布差异明显,西北和东南土壤中Cr含量较高,在63.8 mg/kg以上。各重金属含量分布影响因素定量分析结果表明,土壤重金属含量与土壤性质有较大关系,与城市距离、交通距离、水源地距离也有一定关系。

The Quantitative Study on Spatial Distribution of Soil Heavy Metal and Its Influence Factors in Zhengzhou City

To explore the spatial distribution characters of heavy metals in Zhengzhou suburb and its influence factors containing the soil texture,urban distance,highway traffic distance and water source areas distance,firstly found the spatial distribution character of heavy metals in Zhengzhou suburb in GIS and then analyzed the factor that affect the distribution by the multi-regression.The results showed that,the content of Cd reduced gradually from the west to east in this region.The higher content was above 0.080mg/kg.The content of Hg decreased from north to south,the higher was above 0.055mg/kg;Pb in the soil was distributed relatively high in the northwest of the city.The content was above 25.03mg/kg and the content of As was high in the north but low in the south,the higher was above 5.68mg/kg.The distribution of Cr differed greatly,it was high in the northwest and southeast,the content was above 63.8mg/kg.The quantitative analysis of its influence factors indicated that the content of soil heavy metals were connected with the soil texture,which was also influenced by urban distance,highway traffic distance and water source areas distance.