Low afforestation index has become a general problem in many cities of China, especially in the old city proper.
我国多数城市中心区特别是旧城区普遍存在绿化指标偏低的问题。
Mainly used in the urban construction, highway construction, urban afforestation and so on many domains.
城市建设，公路建设，城市绿化等诸多领域。
The function of afforestation in city has many effects on environment. This article mainly studies the function of weakening noise and different effectiveness made by various green land.
城市绿化对环境的作用是多方面的，本文主要研究绿化对噪声的减弱作用以及各种绿地产生的不同效果。
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