| Urban road green space affects the overall appearance of the city.Road greening can not only improve the environment,sound insulation and noise reduction,and reduce pollution,but also a side reflection of a city’s spiritual civilization and living standard.Wuhe as a long history of water town city,beautiful urban environment,characteristics of urban road greening landscape should become an important part of urban greening construction.In2017,Wuhe County was awarded the title of "National Garden County",with remarkable achievements in road greening.In order to understand the current situation of road greening mode,tree species diversity,tree species form and ornamental characteristics,maintenance and management in the main urban area and Chengnan new area of the county town,analyze and summarize the characteristics and problems of road greening,and further optimize and improve the road greening level of the two districts.In this thesis,39 roads are selected in the urban main area and Chengnan new area.Through the road sample plot(transect)survey,records road greening section form and plant configuration,records road greening tree species(Individual trees.Hedgerows and trimmed spherical trees were not counted)composition,number of plants and other factors.The diversity indexes such as richness,diversity,evenness and dominance of tree species in different regions and different grades of roads and the ornamental characteristics of tree species are calculate.The main conclusions are as follows:(1)In the form of road greening section in Wuhe County,one board and two belts accounted for 46.667 %,and the application frequency was the highest.Two-plate three-belt type accounted for 9.744%,and the other three green section forms accounted for little difference,between 13%-16%.In the whole urban area,there are the most types of green belt configuration mode on the road greening side,and the "arbor + shrub + grass" mode accounted for the largest proportion,and the landscape effect was the best.The types of allocation modes used in street tree green belt was the least,and the proportion of "arbor+ shrub + grass" mode was also the least.(2)The diversity of road greening tree species in Wuhe County was general,the diversity index was 1.205,the evenness index was close to 0.8,and the dominance index was above 0.9.The diversity index of the main urban area was 0.928,the evenness index of tree species was 0.75,and the dominance index was 0.85.The diversity index,evenness index and dominance index of Chengnan new area were 1.233,0.812 and 0.924.Combined with the important tree species,it was worth to find out the basic-tone tree species for road greening were privet,koelreuteria paniculata,camphor,sycamore and crape myrtle.The basic-tone tree species of road greening in the main urban area were privet,koelreuteria paniculata,camphor and crape myrtle.The basic-tone tree species of road greening in the Chengnan new area were koelreuteria paniculata,camphor,crape myrtle and photinia serrulata.(3)In Wuhe County,there were 34 kinds of road greening trees(Individual trees.Hedgerows and trimmed spherical trees were not counted).From the tree morphological characteristics,the ratio of evergreen to deciduous was 0.545,and the ratio of coniferous to broad-leaved was 0.172.According to the ornamental parts,it can be divided into 7categories,among which the foliage species were the most,accounted for 50%;Fruit-viewing species,leaf-viewing and fruit-viewing species,leaf-viewing and form-viewing species were the least,accounted for 2.941%.(4)The problems existing in road greening in Wuhe County were analyzed and the practical and operational rectification measures were put forward.The tree species planning was carried out,and the key points of tree species selection and the greening configuration mode of main road,secondary road and branch road were put forward.The feasible scheme for maintenance management was also put forward. |
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