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城市绿化对环境保护有着重大意义。它不仅是城市建设中点缀、美化的问题,也是利用绿化调节气候,净化空气,消除污染,有利于人民健康的问题。 近年来。世界范围大气污染中的重金属有逐年增加的趋势。为贯彻联合国环境保护计划,欧洲经济共同体农业问题委员会于1979年8日在波兰华沙召开了“大气污染对植物的影响”会议。确立了许多课题,其中以研究生态系统中的植物与土壤的化学性污染本底数据以及重金属的排放量及累积率等影响因素为主,旨在为确定环境质量与标准提供依据。近年
Urban afforestation is of great significance to environmental protection. It is not only the embellishment and beautification issue in the urban construction, but also the issue of using the greening to regulate the climate, purify the air, eliminate pollution and be beneficial to people's health. In recent years. Heavy metals in the worldwide air pollution have a tendency of increasing year by year. In order to implement the UN environmental protection plan, the EAC Committee on Agriculture held a meeting on “The Impact of Air Pollution on Plants” in Warsaw, Poland, on August 8, 1979. A number of topics have been established, including background data on chemical pollution of plants and soils in ecosystems, as well as the impact of heavy metal emissions and accumulation rates, which provide the basis for the determination of environmental quality and standards. in recent years