武夷山市区土壤重金属积累及5种阔叶树富集特征

Soil Heavy Metal Accumulation and Enrichment Characteristics of Five Hardwood Species in Wuyishan Urban Areas

采集武夷山市区香樟、广玉兰、紫薇、悬铃木和杜英5种行道树叶片及土壤样品,检测Cu、Zn、Ni、Cr和Pb共5种重金属含量,并运用多元统计法分析土壤重金属成因及5种树种的重金属富集系数。结果表明:研究区土壤重金属Cu、Zn、Ni、Cr和Pb存在不同程度的富集,分别是福建省土壤元素背景值的3.3、4.7、2.6、6.1和2.7倍;5种树种叶片的重金属含量有显著差异,广玉兰对重金属富集能力显著,可成为武夷山市行道树主力。

Samples were collected from 5 kinds of roadside trees and surface soils in Wuyishan downtown, and the contents of 5 heavy metals including Cu, Zn, Ni, Cr and Pb were determined. Multivariate analysis was applied to examine the sources of heavy metals in road soils, and enrichment factor was used to screen advantage roadside tree species. The average concentrations of 5 heavy metals were higher than the background values of Fujian Province; the mean contents of Cu, Zn, Ni, Cr and Pb was 3.3, 4.7, 2.6, 6.1 and 2.7 times of their respective background values, indicating there were obvious accumulations of these heavy metals in surface soils.The 5 kinds of plants abilities to enrich heavy metals had significant differences in elements and plant species.Magnolia grandiflora had the strongest ability, was the most suitable species for repairing heavy metals pollution in Wuyishan downtown.