With the rapid development of urbanization,urban air pollution,which exacerbates degradation of urban vegetation and loss of ecological services,becomes more serious.Pollutants in air such as O3,UV-B radiation,heavy metals,SO2 and their compound pollutions induce ecological stress on urban vegetation in different levels of molecule,cellule,individual,population,community and ecosystem.In this paper,the authors analyze and summarize the results and methods of previous researches related to ecological stress effects of air pollution on urban vegetation.At the same time,some important research areas,which should be paid more attention to in the future,are proposed including field and long-term stress experiments,combined stress effects,action mechanism for air stress on plants and important role of buildings on ecological stress of urban air pollution,and so on.Finally,the authors point out that related research on urban street trees should be strengthened particularly.
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