Street tree investigation and tree species selection in Hangzhou.

The variety of street trees applied is simple at present by way of investigating current situation in Hangzhou , which dont confirm to the status of international tourism city .Street trees should be diversified .Some hardwoods with high aesthetic value such as Liriodendron chinense , Liriodendron tulipifera , Liriodendron chinense L .tulipifera , Ginkgo biloba , Cercidiphyllum japonicum , Albiaaia julibrissin , Pseudolarix amabilis ,Magnolia denudata , and some ever-green trees with good greening effects such as Neolitsea sericea , Cinnamomum japonicum var .chenii ,Daphniphyllum macropodum ,Machilus thunbergii , Altingia gracilipes and Michelia foreolata var .cinerascens are selected for main street trees .According to five zones composed by the West Lake scenic zone , factory zone , resident zone , window zone , downtown zone , different trees are applied to form scale and specialty in accordance to different function .Furthermore , reasonable assembling between level and color should be considered in order to attain the target of different sceneries with each step , different sceneries in four seasons and green color in four seasons .