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随着社会的发展，交通运输作为经济发展的保障因素，起着重要作用。高速公路为经济建设提供了良好的通道，但也带来了空气、噪音污染的生态问题。因此，在提倡环境保护的今天，公路环境的绿化、美化提到重要的日程上来，已从早期的单纯绿化发展到绿化、美化、香化、净化融为一
With the development of society, transportation plays an important role as the safeguard factor of economic development. The expressway provides a good channel for economic construction, but it also brings about the ecological problems of air and noise pollution. Therefore, in advocating environmental protection, highway greening and landscaping refer to the important agenda up to now. From the early simple afforestation to the afforestation, landscaping, fragrance and purification