不同土地利用方式下西部矿业城市土壤重金属污染状况调查

Survey on the Heavy Metal Pollution in Soil under Different Land-utilization Ways in West Mining City

[目的]揭示不同土地利用类型的土壤重金属污染特征。[方法]以西部矿业城市金昌为对象,调查不同利用方式下土壤中重金属污染的状况和特征,并用富集系数法和Nemero综合指数法对其进行评价。[结果]研究区重金属总体污染程度为Ni>Co>Cu>Cd>As。7种利用类型的土壤综合污染程度存在明显差异。水域、绿地、工业用地、道路广场用地和居住用地均达到重污染,公共设施用地和市政公用设施用地为中污染。研究区重金属污染的浓度以冶炼厂为中心呈扇形分布。污染程度与研究区气象条件、气候状况、污染途径、城市规划布局和工业生产活动有关。[结论]该研究为我国西北矿区城市受污染土壤评估的研究提供了参考依据。

[Objective] The aim was to discover the pollution characters of heavy metal in soil with different land-utilization types.[Method] With the western mining city Jinchang as object,the pollution condition and characters of heavy metal in soil with different utilization ways were investigated and they were evaluated by the method of enrichment coefficient and Nemero comprehensive index.[Result] On the whole,the pollution degree of the heavy metal in the investigated area was Ni〉Co〉Cu〉Cd〉As.. There was obvious difference on the comprehensive pollution degree among soils with 7 kinds of utilization types. The water area, greenbelt, industrial land, path and square land and residential land all reached to heavy pollution, and public facility land and municipal utility land belonged to moderate polhution. The conch, of the heavy metal pollution in the investigated area appeared as the fan with the smelting factory as the center. The pollution degree was related with weather condition, climate condition, pollution ways, city planning layout and industrial.predoctioa activities of the investigated area. [ Conclusion] The research provided the reference for the study of the evaluation on the polluted soil in the northwest mining city of China.