10个常绿树种对砷汞铅镉铬的富积能力研究

Heavy Metal Accumulation Capability of Ten Broadleaved Tree Species to As,Hg,Pb,Cd and Cr

通过对10个常绿树种在昆钢污染区和对照叶片中砷、汞、铅、镉、铬5种重金属元素含量的试验测定,分析了各个树种对重金属的富积能力。结果表明,同一树种对不同类型重金属元素的富积能力不同,不同的树种对同一类型重金属的富积能力也有很大差异;参试的10个树种均对重金属元素表现出较好的抗性和富积能力,其中对砷、汞、铅、镉、铬的富积能力最强的树种分别是鳞斑荚蒾、红果树、鳞斑荚蒾、金叶子和云南泡花树。污染物中砷、铅、铬和镉的含量占了较大比重,各重金属元素在污染时存在相互关联。按综合富积能力排序,依次是鳞斑荚蒾>茶条木>云南泡花树>云南卫矛>红果树>飞蛾槭>子楝树>滇青冈>金叶子>云南木樨榄。

The contents of As, Hg, Pb, Cd and Cr in leaves of ten broadleaved tree species growing in the pollution area of Kunming Steel Company were determined to compare and analyze the heavy metal accumulation capabilities of the tested tree species. The results showed that the same species had different accumulation to different elements, simultaneously different species showed quite different accumulation to the same element. As, Pb, Cd and Cr were the main heavy pollution elements in the study area, and the all the elements were correlated with each other. Considering accumulation capability totally, the heavy metal element accumulation capabilities of these ten broadleaved tree species could be ranked as Viburnum punctatum 〉 Delavaya yunnanensis 〉 Meliosma yunnanensis 〉 Euonymus yunnanensis 〉 Stranvaesia davidiana 〉 Acer oblongum 〉 Decaspermum fruticosum 〉 Cyclobalanopsis glaucoides 〉 Craibiodendron yunnanense 〉 Olea yunnanensis.