| Expressway,as the main traffic artery of a city,occupies an important position in urban traffic,and is often the facade of a city.Its green space system directly shows the civilized degree and spiritual outlook of a city.Based on the related theories of urban greening tree species and the method of phytocoenology,this paper investigates and analyses the current situation of plant allocation in the green space of Hetan Expressway in Urumqi by sampling method,mainly including plant species,allocation mode,ornamental characteristics and so on,so as to summarize the hetan in Urumqi City.Characteristics of plant configuration in Expressway green space.Among the 41 sample plots surveyed,there are 38 sample plots of Expressway roads,3 traffic island greening,and the present situation and characteristics of vegetation allocation of Hetan Expressway roads in Urumqi are summarized as follows:(1)In the sample plots,there are 36 families,59 genera and 80 species of plants.The families with more than three genera are Rosaceae,Oleaceae,Leguminosae and Compositae.The proportion of tree species to shrub species is about 1:0.59,that of evergreen species(including semi-evergreen species)to deciduous species is 1:18.33,that of native species to exotic species is 1:0.34,that of deep and shallow roots is 1:0.48,and that of slow-growing,middle-growing and fast-growing species is 1:0.71:3.57(2)The vegetation community of the green land of the Hetan Expressway is mainly deciduous broad-leaved type,supplemented by the mixed evergreen and deciduous type.The vegetation community types are basically similar.(3)From the richness index of trees and shrubs,Gleason species richness index and Margalef species richness index,it can be seen that the vegetation in the green space of the Hetan Expressway is dominated by trees,and the diversity of tree layer and shrub layer is great.(4)Among the sample plots investigated,there are three types of horizontal structure:one-plate-two-belt,four-plate-three-belt and four-plate-five-belt.(5)Among the vertical structure allocation patterns of the two sides of the split-car greenbelt,tree+small tree+shrub+ground cover plant+lawn pattern had the highest frequency of application.There are two patterns of plant vertical structure allocation in traffic island green land sample plot:tree+small tree+shrub+ground cover plant,shrub+ground cover plant.(6)There were 53 kinds of flowering plants,27 kinds of fruit-observing plants,34 kinds of leaf-observing plants and 14 kinds of drought-observing plants in the surveyed sample land.The proportion of flower-observing plants,fruit-observing plants,leaf-observing plants and drought-observing plants on the riverside expressway was 1:0.51:0.64:0.26,and the number of fruit-observing plants needed to be appropriately increased.The species of flowering plants in the ground cover layer account for a large proportion,while those in the tree layer account for a large proportion of fruit-observing,leaf-observing and drought-observing plants.It is suggested to increase the species of fruit-observing,leaf-observing and drought-observing plants in the shrub layer appropriately.To sum up,although there are many ornamental plants in the greenbelt of hetan expressway in urumqi,the configuration style is relatively uniform,which leads to poor ornamental effect in the four seasons and winter.To further do a good job of urumqi river beds expressway greenbelt plant configuration,combined with domestic expressway greenbelt plant configuration mode,the urumqi river expressway greenbelt plant configuration put forward the following Suggestions:(1)It is suggested that in the construction of expressway green space,different plant communities should be segmented and the species of shrub species should be increased.It is suggested that the species of evergreen species should be appropriately increased to enrich the plant community types.At the same time,it is suggested that the background plants should be grouped in order to achieve orderly distribution and orderly opening and closing of landscape space.(2)It is suggested to add slow-growing tree species in an appropriate location according to the existing plant planting situation of hetan expressway greenbelt.(3)It is suggested to interplant some barren tolerant evergreen shrubs in the central subdivision green belt.(4)It is suggested to increase the number of fruit-observing species as a whole,increase the number of flower observing species in the arbor layer,increase the number of leaf-observing and drought-observing species in the shrub layer,and plant the leaf-observing and fruit-observing seed bushes or groups in the green space.There are relatively few color-leafed plants in the tree layer and shrub layer,and it is suggested to increase the species of autumn leaf,constant-color leaf and two-color leaf appropriately.(5)It is suggested to select an appropriate green space location to plant plant pattern color blocks according to the existing plant configuration,so as to alleviate the visual fatigue of driving. |
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