Heavy Metal Content in the Leaves of Four Tree Species andIts Function in Air Pollution Evaluation

In 2015, determinations were implemented on Pb, Cd, Cu and Zn content in leaves of Cedrus deodara, Ilex chinensis, Cinnamomumcamphora ,and Magnolia grandiflora at 4 typical areas and one control in Pudong New Area, Shanghai City. Analysis were made on relationshipbetween content of heavy metals in tree leaves and that in air pollution. The results showed that Pb, Cd, Cu and Zn content in the leaves of differentplants had positive relation with their own concentration in the air. The content of heavy metals varied with types of metal, tree species and sampledarea. The determination demonstrated that M. grandiflora had the highest accumulation in Pb and Cu, and C. deodara had the highest in Cd and Zn.Analysis on metal content in tree leaf at different areas resulted air pollution orders of Pudong New Area, Shanghai.