在积极改善城市生态环境,治理环境污染中,植物起着关键性的作用。大家都知道,一个人每天要吸收0.75公斤氧气,呼出0.9公斤二氧化碳,由此推算出每人至少要拥有10—15平方米森林或25—30平方米草坪才能获得新鲜空气,加上工业、交通运输所消耗的氧气远远大于人的耗氧量。因此,联合国生物圈生态与环境组织提出城市居民人均拥有60平方米绿地,才能获得最佳居住环境。华沙、堪培拉、维也纳、斯德哥尔摩等都已超过了这一标准,华盛顿、巴黎、柏林、莫斯科、伦敦、新加坡、深圳等名城 In actively improving the urban ecological environment, environmental pollution control, plants play a key role. As we all know, a person absorbs 0.75 kilogram of oxygen a day and exhales 0.9 kilogram of carbon dioxide. From this we can calculate that each person must have at least 10-15 square meters of forest or 25-30 square meters of lawn in order to obtain fresh air. Coupled with industry, transportation The oxygen consumed by transport is far greater than human oxygen consumption. Therefore, the United Nations Biosphere Ecology and Environment Organization proposed that per capita urban residents have 60 square meters of green space in order to obtain the best living environment. Warsaw, Canberra, Vienna, Stockholm, etc. have exceeded this standard, Washington, Paris, Berlin, Moscow, London, Singapore, Shenzhen and other cities