STUDY ON MULTIVARIABLE STATISTICS AND SPATIAL DISTRIBUTION OF URBAN SOIL HEAVY METALS AT DIFFERENT TRAFFIC CIRCLE (BAND)——WITH THE EXAMPLE OF WUHAN
Soil heavy metal pollution is one of the environmental issues that paid much attention in recent years.It's not only directly destroy the environmental quality,but also do great harm to the human health indirectly.So it's significant to study the accumulation and distribution of heavy metal in the city soil.In this study,we analyzed the accumulation status and the pollution source ofNi,Cd,Cr,Cu,Pb and Zn in the topsoil in the different traffic circles in Wuhan,and estimated the level of pollution and ecological hazard of the heavy metal,also obtained the spatial distribution map of the elements with the spatial interpolation by ArcGIS.The conclusion is as follows.(1) The mean of heavy metal ofNi,Cr,Cu are lower than the background value of Hubei province,the average value of Cd is almost ten-fold of the national second-level standards.Its accumulation is the most serious.(2) The multivariate statistical analysis shows that the six elements can be clustered into two kinds.One kind is Ni and Cr,the other is Cd,Cu,Pn and Zn.The former's pollution source is mainly the soil-forming factors such as climate,parent material and decades,the latter is mainly affected by the influence of parent material and human activity such as traffic and industry.(3) The pollution conditions varied from different research area.The accumulation in the inner ring is the most serious,the third ring's pollution is the second,and the second ring's pollution is the minimum.(4) The assessment results of heavy metal pollution and ecological risk showed that the research area was serious polluted or highly ecological hazarded,and the degree of inner ring was bigger than that of the third ring,and the degree of third ring was bigger than that of the second ring.
urban soiltopsoilheavy metal pollutionmultivariate statistical analysisassessmentspatial interpolation
NETL
NSTL
万方数据
