诸暨市城区主要街道树种多样性与配置模式初探

Research on Roadside Tree Diversity and Collocation on Main Streets of Zhuji City

采用抽样法对诸暨市城区50条主要街道绿化树种的种类及其生长状况进行了实地调查，运用物种出现频度、物种多样性指数等指标对街道绿化树种多样性及其配置模式进行了分析。结果表明：诸暨市主要街道的绿化树种有66种，隶属39科，其中乔木12科19种、灌木20科32种、地被植物7科16种；乔木类使用频度最高为香樟34.57%，灌木类使用频度最高为红花檵木9.77%；绿化树种多样性指数2.0-2.5的街道最多，占30%；树种的配置模式有乔木单层结构、乔灌两层结构和乔灌草三层结构，其中三维空间的立体结构类型的街道有11条，占所调查街道的22%。但诸暨市城区主要街道绿化树种的物种多样性偏低，城市绿化景观特色还不够鲜明。

A survey was conducted on species and growth conditions of roadside trees on 50 main streets of Zhuji city.Analysis was done on the diversity of the trees and the types of collocation using indexes such as frequency of occurrence and species diversity.The results showed that there were in total 66 species of roadside trees that belonged to 39 families.Of all the species,19 were arbors of 12 families,32 were shrubs of 20 families and 16 were ground-covering plants of 7 families.The arbor species with the highest frequency of occurrence was Cinnamomum camphora,which accounted for 34.57% of all arbors.The shrub species with the highest frequency was Loropetalum Chinese,which accounted for 9.77% of all shrubs.The streets having a diversity indexes of 2.0～2.5 were mostly seen and accounted for 30% of all streets.There were three types of spatial collocation including arbors-only single layer;arbors and shrubs two-layer,and arbors,shrubs and ground-covering plants three-layer structures.Three-layer collation was seen on 11 streets,which accounted for 22% of the total streets.However,the overall tree species diversity was relatively low and the landscape characteristics of the city was not very bright.