成都平原菜园土壤及主要蔬菜作物重金属背景值的研究

BACKGROUND VALUES OF HEAVY METALS IN GARDEN SOIL AND VEGETABLES IN CHENGDU PLAIN

本文按制定环境背景值的规范程序,研究制定了成都平原菜园土壤及主要蔬菜作物8种重金属元素的背景值。考虑到某些地区可能已有重金属污染,因此设立了一个基本未污染的参照区。研究结果表明,成都平原菜园土壤全区的重金属背景值明显地高于参照区,蔬菜背景值全区与参照区的差异不如土壤显著。作者建议,参照区背景值可视为基本被污染的背景值,全区背景值可视为现阶段背景值,可供继续研究重金属污染参考。本文还分别用距离系数和相关系数对蔬菜和土壤的重金属含量进行了聚类分析。

The background values of heavy metals in garden soil and vegetables in Chengdu Plain have been studied. The investigated metals were Hg Pb Cd As Cr Ni Cu Zn and the investigated vegetables were lettuce leaf,lettuce stem,cabbage, eggplant and radish. Considering the possibility of some sampling spots might be polluted by heavy metals, a reference area of garden soil far away from the Chengdu City was set up as a non-polluted area. The studied results showed that the background values of garden soil in whole area were significant higher than that in the reference area. Comparing the background values of vegetables between the whole and reference area, less significant differences were found. Therefore, the authors suggested that the background values in reference area could be considered as the non-polluted values, and the background values in whole 'could be considered as the present background values and could be used for studying heavy metal continue pollution in future.