南京市14种绿化树种对空气中重金属的累积能力

分析了南京化工厂（污染区）和江苏省林科院（对照区）不同绿化树种叶片重金属元素（Pb、Cd和Cu）的含量，揭示了14种绿化树种对3种重金属污染物的累积能力。结果表明，城市绿化树种对大气重金属污染物具有一定的吸收净化能力，并依重金属和树种的不同具有明显差异；同种植物对不同重金属的累积量也有很大差别，其中对Cu的累积量最高；采样区植物叶片重金属含量明显高于对照区；对Pb累积量高的树种有：杨树、广玉兰、女贞和紫叶李； Cd累积量高的树种为杨树；Cu累积量高的树种为构树；累积3种重金属综合能力最强的树种有杨树、构树、雪松、广玉兰、悬铃木、栾树。

Accumulation Capacity of Nanjing 14 Virescence Tree Species to Heavy Metal Pollutants of the Atmosphere

Based on the studies on heavy metals (Pb,Cd and Cu)in leaves of different plants, the pollution situation was determined for the Chemical plant of Nanjing (pollution reigon) compared to the Jiangsu Academy of Forestry as control sites, The accumulation ability of 14 virescence trees to 3 kinds of heavy metal in the atmosphere was dealt with in this paper. The results showed that the urban green tree species could absorb heavy metal pollutants to different extent depending on heavy metal kinds and tree species. Concentration measure of one tree species plant to these heavy metals was markedly different,and accumulation ability of green trees to Cu ranked first in heavy metals. Heavy metal content in leaves of plants in sampling reigon was obviouly higher than control sites. Populus deltoides, Magnolia grandiflora, Ligustrum lucidum and Prunus cerasifera have high absorption capacity to Pb, Populus deltoides have high absorption capacity to Cd,while Broussonetia papyrifera have high absorption capacity to Cu. And P. deltoides, B. papyrifera, Cedrus deodara, Magnolia grandiflora, Platanus hispanica and Koelreuteria paniculata have high absorption capacity to three kinds of heavy metals.