Survey of Plant Community Structure of Greenspace along Urban Streets in Nanjing City

A greenspace survey was conducted into 24 major streets in the urban area of Nanjing City, 69 arbor tree species from 26 families, and 34 shrub species from 19 families were indentified.It was found out that the highest application frequency of arbor tree specie was Platanus acerifolia, which reached 42% and Pittosporum tobira was the shrub tree specie with the highest application frequency that reached 64%.The number ratio of the evergreen tree species and the deciduous tree species was 100∶124, the number ratio between the evergreen arbor tree species and the deciduous arbor tree species was 10∶13.The ratio of arbor tree species and the shrub tree species was 2∶1, while the number ratio of arbor and shrub tree species was 10∶32.It was proposed that the ratio among different categories of plants for street greenspace should be improved according to the ecological adaptability, comprehensive function, landscaping purpose and based on integrated consideration of the local geographical, climatic, social, historical and humanity background in Nanjing City.