银川市不同功能区土壤重金属特征评价及分析

Evaluation and Analysis of the Characteristics of Soil Heavy Metals in Different Functional Areas in Yinchuan City

文章以银川市城市绿地及公园、道路绿化带、工业区、行政区及商务区、荒地、居民区、商业区、科教区作为研究对象,采用单因子指数及内梅罗指数法对不同功能区土壤重金属污染来源、污染程度及潜在生态风险进行分析,研究表明:银川市不同功能区Cr和Pb的背景值均超过宁夏土壤重金属背景值;城市公园及绿地的Cr含量最高,商业区Cu、Mn含量最高;工业区Pb的含量最高,科教区总体来看重金属富集程度最低;重金属含量的相关性分析表明,重金属污染源为多个污染源共同影响;不同重金属元素单因子污染指数中Cr>Pb>Mn>Cu>As,内梅罗污染指数排序为工业区>商业区>居民区>行政区及商务区>城市绿地及公园=道路绿化带>荒滩>科教区;银川市各个功能区重金属潜在生态风险等级均为最低等级,单一潜在生态风险排序为Pb>Cu>Cr>As>Mn,功能区潜在生态风险排序为商业区>居民区>工业区>行政区及商务区>道路绿化带>城市绿地及公园>荒滩>科教区。

This article uses Yinchuan City’s urban green space and parks,road green belts,industrial areas,administrative areas and business districts,wastelands,residential areas,commercial areas,and science and education districts as the research objects.The single factor index and Nemerow index method are used to analyze different functional areas.The analysis of soil heavy metal pollution sources,pollution levels and potential ecological risks shows that the background values of Cr and Pb in different functional areas of Yinchuan City exceed the background values of soil heavy metals in Ningxia;urban parks and green spaces have the highest Cr content,and commercial areas Cu and Mn The highest content;the highest content of Pb in the industrial area,and the lowest concentration of heavy metals in the science and education areas as a whole;the correlation analysis of the content of heavy metals shows that the heavy metal pollution sources are affected by multiple pollution sources;the single-factor pollution index of different heavy metal elements is Cr>Pb>Mn>Cu>As,the Nemeiro pollution index is ranked as industrial zone>commercial zone>residential zone>administrative zone and business zone>urban green space and park=road green belt>barren beach>science and education zone;the potential ecology risk levels of heavy metals in various functional zones in Yinchuan are all the lowest.The single potential ecological risk ranking is Pb>Cu>Cr>As>Mn,and the potential ecological risk ranking of functional zones is commercial zone>residential zone>industrial zone>administrative zone and business zone>road green belt>urban green space and park>desolate beach>science and education zone.