南通市城市边缘带土壤重金属污染现状及评价

通过对不同土地利用方式下的7个样区进行系统的采样测定,对南通城市边缘带土壤重金属富集与污染状况进行了分析与评价。结果显示,研究区土壤未发生明显的重金属污染。但3个样区的土壤有轻度的重金属污染现象,Zn是发生富集最普遍的元素,约76%的样点土壤Zn富集指数>1,18%的样点土壤出现Zn的轻度污染。Cu、Pb等重金属元素导致的污染也在零星样点被发现。方差分析表明,土地利用方式不是导致研究区土壤重金属含量空间差异的主要因素,而土壤类型、样区空间环境与土壤重金属含量及富集、污染有相对密切的关系。

Status and Assessment of Heavy Metal Pollution of Soils in The Peri-Urban Nantong

Based on laboratory analysis of soil samples collected from 7 plots located in the peri-urban Nantong,enrichment of heavy metals in the soils was investigated and the soils were evaluated for heavy metal pollution. Results indicated that no significant heavy metal pollution occurred in the study area as a whole. Slight enrichment of some metal elements,however,was found in the soils of 3 amongst the 7 sampling sites. Zn enrichment in the studied soils was the most prevalent and found in 76% of the sampling sites. And about 18% of the sampling sites were found slightly polluted with Zn. Besides,pollution by some other metal elements,such as Cu,Pb,was also be detected in a few sites. ANOVA results showed that difference in landuse was not one of the main causes leading to spatial variation of concentrations of soil heavy metals. Instead,relative close relationships were found of contents and enrichment of heavy metals in soils with type of the soil and environment of the sampling site.