城市是社会经济发展的必然产物,建设一个既舒适、方便,又清洁、优美、文明的现代化城市生态环境,是人们的普遍愿望。为此,除了必须采取一系列措施控制和治理环境污染,还必须应用经济生态学原理,通过生物措施,发展城市绿化,建设城市林业。1 国内外城市林业的发展趋势近20年来,美国开展的“城市森林”运动,就是把森林引入城市,创造城市绿地系统中的绿岛,提 Cities are the inevitable result of social and economic development. It is a common aspiration for people to build a modern urban ecological environment that is comfortable, convenient, clean, beautiful and civilized. To this end, in addition to a series of measures that must be taken to control and control environmental pollution, we must also apply the principle of economic ecology to develop urban afforestation through biological measures and build urban forestry. 1 Trends of Urban Forestry at Home and Abroad Over the past two decades, the “urban forest” campaign carried out by the United States has introduced forests to cities and created green islands in urban green space systems.