Research On Characteristics Of Soil Heavy Metals Pollution In Greenbelt Of Zhangzhou City

The research of heavy metal pollution of urban greenbelt and soil is one of the most important research on city environment. As a important part of city ecosystem, urban greenbelt not only provides venues for people’s entertainment and leisure activities but also is very significant to improvement of urban ecological environment.In this paper, the research object is Zhang zhou city, and soil samples was collected from the park greenbelt、the road greenbelt、the residential greenbelt and the accessory Greenbelt. The soil pH, organic matter content, magnetic properties, and heavy metals content(including Cr, Ni, As, Cu, Cd, Zn and Pb) were revealed systematically through calculation and analysis. Combined the Fujian province soil background values and national soil classification standard, the soil physicochemical properties and accumulation of heavy metals were ultimately summarized in detail. In the course of the study, Pearson correlation analysis, principal component analysis and software like SPSS were used in the process of the analysis of physicochemical properties and the relationship between different elements of heavy metal. At last, the paper assessed the soil heavy metals pollution for urban greenbelt in Zhang zhou on the basis of the application of different evaluation models.The analysis has shown that soil of Zhang zhou urban greenbelt is neutral(pH=6.27), and the content of organic matter varies greatly (2.27-27.79g/kg),41%of the samples are in the national standard of fourth. The Soil has a significant magnetic enhancement (X=300.39x10-8m3/kg). The analysis also shows that the main factors that cause heavy metal pollution are the industrial "three wastes ", vehicle exhaust, residents living garbage and soil parent material. And the pollution sources appears in a composite form. Compared with the local background values, the content of heavy metals in the soil mostly has been accumulated to a high extent. Except Cr and Ni, other elements are in the pollution status. The four greenbelt function areas are subject to pollution in varying degrees, and it has a strong ecological risk. The pollution of Cd is particularly prominent among the seven heavy metal elements. The heavy metal pollution of urban greenbelt of Zhang zhou is very serious and in a high ecological risk index. The relevant departments should take it seriously.