DISTRIBUTION CHARACTERISTICS OF HEAVY METAL AND ECOLOGICAL RISK EVALUATION OF VEGETABLES RHIZOSPHERE SOIL IN GREEN INDUSTRY PARKS IN ZHENJ IAN G CITY, CHINA

摘要

In order to reveal the pollution loading of heavy metals in vegetables rhizosphere soil of green industry parks in Zhenjiang City, China, six heavy metals (Cr, Ni, Cu, Cd, Pb and Zn) from 7 green vegetables rhizosphere soil samples were analyzed by using ICP. The results showed that: 1) the average contents of Cr, Ni, Cu, Cd, Pb and Zn were 83.08, 37.05, 34.20, 0.23, 24.11 and 180.12 mg/kg, respectively. 2) the average value of enrichment factor was Ni>Cr>Pb>Cd>Zn>Cu. And the order of total EF values was S6>S1>S2>S5>S7>S3>S4, indicated the most serious at S6 sampling point, while was the smallest enrichment at S4 sampling point; 3) The mean values of geo-accumulation indexes of 6 heavy metals were all less than zero, indicating that metal pollution was at a clean level. 4) Cr, Ni, Cu, Cd, Pb and Zn had slight potential ecological risk judgment by the RI value; 5) The correlations analysis, principal component analysis and factor analysis revealed that the Cr, Ni, Cu, Cd and Pb was the first factor to dominate the first principal component and might come from the common sources of parent rocks in this region. Zn had a high loading values in the second the principal components, while the correlations was not significant, which indicated that Zn could have not a similar pollution sources, which represents anthropogenic sources.