目前对城市环境的要求越来越高,而提高环境质量的诸因素中,搞好园林绿化是最直接最有效的措施。构成园林绿化的主要材料是园林植物,其主体是树木。作为一个城市,当然是园林树木品种越多,越能构成丰富多采的园林空间。但是由于地域、气候、科技、经济与自然因素和人为因素的制约,园林树木品种的利用也受到了限制,已经应用的树木品种也不可能都非常理想。那么,对城市现存的树木品种制定一个标准进行选择, At present, the requirements on the urban environment are getting higher and higher, and improving the quality of the environment is the most direct and effective measure to do a good job of landscaping. The main material that constitutes the afforestation is the garden plant, whose main body is the tree. As a city, of course, the more varieties of garden trees, the more able to form a rich and varied garden space. However, due to geographical, climatic, scientific and technological, economic and natural factors and human factors, the use of garden tree species is also limited, and the applied tree species can not be very ideal. So, to develop a standard selection of the city’s existing tree species,