成都市高校绿地重金属形态分析研究

Research of space distribution characteristics and environmental significance for heavy metals in the campus greenlbelt of Chengdu City

研究了成都市部分高等学校校区公共绿地重金属含量状况、空间分布及化学形态特征.结果表明:校区绿地重金属Cd、Cu、Pb、Zn的总量均高于全国土壤几何均值和川西平原水稻土背景值,受到了不同程度污染;土壤中同一重金属元素含量在不同校区的分布差异显著;各重金属元素形态分布规律并不完全相同,但均以残渣态为主;土壤中Zn活性态的比例最高,活性态Pb的比例最低,并对重金属的来源做了初步探索.

This paper discusses the concentration,space distribution and chemical species of heavy metals in different campus greenbelts of Chengdu city.The results indicate the surface soil is contaminated by heavy metals.Pb,Cd,Cu and Zn contents are 1.5,3.8,2.3,1.8 times respectively of the mean values of national background,and 1.5,1.8,1.6,1.5 times of the mean values of paddy soil background in West Chengdu Plain.The further results show the contamination of Cd is most serious and should be paid more attention to,and Cu,Zn and Pb follow.The spatial distribution of heavy metals is different and the proportion of active fraction of the same heavy metal is significantly different from the different campus greenbelts.The sources of heavy metals are further explored.