重庆都市经济圈土壤重金属地球化学特征

[目的]研究土壤中重金属地球化学特征,以及土壤与成土母质(母岩)之间的关系,为城市发展规划、环境保护与利用提供科学依据。[方法]对重庆都市经济圈土壤(浅层与深层)As、Cd、Cr、Cu、Hg、Ni、Pb、Zn等8种重金属的分布状况及地球化学特征进行调查与评价。[结果]调查结果表明,研究区母岩中重金属元素与岩石圈相比As和Cr(除侏罗系下统)含量都高于岩石圈平均含量,其他重金属元素含量低于或与岩石圈平均含量相当。[结论]重庆市作为我国较老的工业城市,深层土壤中重金属元素除了从母岩中继承而来,还有外源的加入,而浅层土壤受到外源影响更大,污染也更严重。

Geochemical Characteristics of Soil Heavy Metals of Chongqing Metropolitan Economic Zone

[Objective]The research aimed to study the geochemical characteristics of soil heavy metals and the relationship between soil and parent material,providing scientific basis for urban development planning and eco-environmental conservation and utilization.[Method] The soil of Chongqing metropolitan economic area had been studied to investigate the distribution and assess geochemical characteristics of the heavy metals.[Result] The results showed that the contents of As and Cr(except in Lower Jurassic) in research area were higher than the average of the lithosphere.The other heavy metals were at the similar level with the lithosphere or lower.[Conclusion] As an old industrial city,the heavy metals in deep soil was not only the inheritance of the parent rock,but also was the results of the pollution in Chongqing.The top soil was influenced and polluted badly than the deep soil.