| With the expansion of urban scale,urban population and the development of modern industry,the scope of urban green space is occupied by buildings in the 1980s.While the city biodiversity and city living environment and sustainable development is closely related to the diversity of city built area green plant species research,is also an important way to achieve the protection and construction of city biodiversity.The study selected 1308 survey points in Taiyuan City.It investigated the city and all kinds of green space landscapeand the diversity index of landscaping trees in Taiyuan City.It will provide a useful reference and suggestions to the construction of the Garden Greenbelt and the protection and utilization of the trees,guide the future of the city construction in Taiyuan city.(1)The existing landscaping in Taiyuan a total of 239 species belonging to 49 families,97 genera,Comprehensive analysis of three kinds of trees and the application of the frequency of the main tree species in Taiyuan.The main tree species were Sophora japonica,Euonymus bungeanus,poplar,pine,willow,elm,ginkgo,jujube,purple leaf plum,flowering plum,Pinus bungeana;main shrub species in Jiaodong,lilac,forsythia,Euonymus crabapple,honeysuckle,hibiscus,rose,Euonymus,pepper,begonia;main tree hedgerow in the order of Euonymus japonicus,Jiaodong Euonymus,Ligustrum,barberry,Parthenocissus,Buxus,Sabina vulgaris,Rosa and p.quinquefolia,ulmus.(2)In Taiyuan City,there are 20 species and 219 species of gymnosperms and angiosperms in,with the ratio of 1:10.95.There are 131 tree species,104 shrub species,trees and shrub proportion is 5.6:4.4..There are 37 species of evergreen trees,deciduous species have 202 species,evergreen and deciduous species ratio of 1:5.46.(3)According to Li Xiwen’s classification of the geographical distribution types,the 49 families of Taiyuan landscaping trees are divided into the 9 types and 1 forms.The pan tropical distribution is the most of geographical composition,there are 22 families,accounting for 44.90%of the city’s greening families.According to Wu Zhengyi’s classification of Chinese genera of seed plants,the 96 genera and 239 species of landscaping trees in Taiyuan city are divided into 12 types and 7 forms.Among them,there are 35 genera and 119 genera in the north temperate zone,which occupy the first place among the geographical elements.Secondly,there are 12 genera and 26 species in the pantropical distribution,which are in the position of the second place.The geographical elements of families,genera and species showed that the distribution of temperate zone was the main component of the geographical composition of the landscaping trees in Taiyuan.(4)In the four kinds of green spaces,the tree species richness of park green space is highest,there are 225 kinds of greening trees,followed by the attached green space and road green space,there are 199 kinds of tree species and 151 species,the least green tree species used for the protection of green space,it have 127 species.(5)The landscape tree species can be divided into the following categories:native species,naturalized species,domesticated species and exotic species by the source of the four species in Taiyuan.Division of native species in Taiyuan plain basin area and hilly area as the basis.There are 29 families,60 genera and 117 species of native tree species,There are 12 species,belonging to 14 genera and 21 species of naturalized species,there are 50 species,27 genera and 88 species of domesticated species,and there are 12 species,12 genera and 13 species of exotic species.The ratio of native tree species and introduced species is 1:1.04.(6)There was a high abundance of landscape trees in Taiyuan,the arbor species richness is highest,followed by shrub species,Hedgerow species the lowest.On the diversity index of Shannon and the Shannon-Weiner index,Arbor diversity was highest,followed by shrub species,Hedgerow species the lowest.In the evenness,arbor and shrub species evenness is close,and were higher than hedgerow species. |
PDF Full Text Request