Responses of street trees to heavy metal pollution and their functional\|type grouping

In order to select the proper species for traffic pollution monitoring, we measured the content of heavy metals (Pb, Cd and Cu) and physiological indices (soluble protein, free proline and MDA) in the leaves of 14 representative greening species on the arterial roads and suburb roads in Nanjing City. The contents of heavy metals in leaves of trees growing on the arterial roads were significantly larger than those on the suburb roads, indicating that transportation pollution was becoming more serious. Meanwhile, the contents of soluble protein, proline and MDA were much higher on the arterial roads than those on the suburb roads, which could be suffered from transportation pollution. According to the physiological indices and heavy metal contents, Prunus cerasifera, Cedrus deodara and Populus deltoides are proper species for traffic pollution monitoring. The functional types of the species were divided based on the differences in their heavy metal contents. 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