常见园林树种的叶片重金属元素含量及富集特征

Content and Enrichment Characteristics of Heavy Metals in Leaves of Common Garden Tree Species

通过在汕头市贵屿镇重金属污染区对广东省内常见小叶榕、水翁等15种园林景观植物进行栽种试验,研究了这15种植物叶片的重金属含量及富集系数。结果表明:对Pb的富集系数最高的是小叶榕;对Cd富集系数最高的是假连翘;对Ni富集系数最高的是山杜英;对Cu富集系数最高的是大叶相思;对Hg富集系数最高的是鸡冠刺桐。可将对Pb、Cd、Ni、Cu、Hg富集能力较强的树种作为后续重金属植物修复的重点研究对象,为植物修复重金属污染提供一定的理论支持。

Fifteen common landscape plants in Guangdong Province were planted in heavy metal contaminated areas of Guiyu Town.Heavy metal content and enrichment coefficient in leaves of these 15 plants were analyzed.Result shows that the highest enrichment coefficient of Pb is Ficus benjamina;the highest enrichment coefficient of Cd is Duranta repens;the highest enrichment coefficient of Ni is Elaeocarpus sylvestris;the highest enrichment coefficient of Cu is Acacia auriculiformis;the highest enrichment coefficient of Hg is Erythrina crista-galli.Through the study of leaf enrichment ability,the tree species with strong enrichment ability of Pb,Cd,Ni,Cu and Hg can be taken as the key research object for the follow-up phytoremediation of heavy metals,which provide some theoretical support for phytoremediation of heavy metal pollution.