Study On The Landscape Plants Arrangment Of Road Green Space In Dalian

Plant arrangement in Dalian reflects high reputation and evaluation in the Northeast and coastal cities. The road green space of Dalian is an important part showing its urban green land system, while to build a scientific and rational man made plant community structure can make green space in Dalian develop stably, efficiently and healthily. Through the analysis of green space, scientificity of plant arrangement, aesthetic degree had been discussed, which have important practical significance in providing a basis for its construction.In this paper, road green space in Dalian as the study object, the survey scope includs 480 roads in urban regions and economic and technical development zone, including 3 fast roads, 29 trunk roads,73 secondary trunk roads,375 branches, a total of 702 research samples. On this basis, typically artificial plant communities standing for 28 kinds of arrangement patterns among in the survey, were chosen to conduct investigation and systematical analysis, and comprehensively evaluate the landscape of plant communities, in which representative plant communities of nine kinds of arrangement patterns with higher frequency were chosen to draw their ichnographies and analyze the application rationality of plant community arrangement from the community structure and landscape effects and other aspects.On this basis, reasonable suggestions on the problems exsiting in road plant arrangement of Dalian and the optimization models of plant arrangement adapted to road green space of Dalian are summarized. The main conclusions are drawn as follows:1. The characteristics of artificial plant community of the road green space in Dalian are investigated and analyzed in quantification. There are a total of 120 species of plants used in Dalian road green space,including 62 species of trees,43 species of shrubs,15 species of herb flowers, in which the proportion of trees and shrubs is approximately 1.5:1; the proportion of evergreen and deciduous plants is 1:4; the proportion of slow-growing species and fast-growing species is 1:2.3; there are 28 species of native plants, accounting for 27% of the total, a large margin to more than 70% of native plant species required by ecological garden city. Sabina komarovii,Platanus orientalis,Sophora japonica etc, are as the main trees in emerging frequency;Euonymus japonicus,Ligustrum×vicaryi,Berberis thumbergii 'Atropurpurea',Buxus sempervirens etc, are the main shrubs; only about 30 species trees and shrubs are in higher frequency and lager quantity among 150 species and the diversity of green plants is not rich.2. Dalian road green plant diversity of different road levels has significant differences. Simpson index, Shannon-Wiener index and Pielou index have the same evenness tendency in the performance of trunk road, secondary trunk road, branch, being trunk roads> secondary trunk road> branch and three diversity indices show a significant positive correlation trend.3. On the basis of investigation and analysis of plant communities, the rational appraisal system in landscape effect and ecological benefit, into which 10 evaluation factors and AHP are applied, is built to comprehensively evaluate plant landscape of Dalian road green space. The comprehensive landscape levels of plant communities are made according to comprehensive evaluation value and subordinate degrees of comprehensive quality of landscape. Among the landscape comprehensive evaluation of 28 plant communities,Ⅰ-class landscape of communities accounted for 18%;Ⅱ-class landscape of communities accounted for 32%;Ⅲ-class landscape of communities accounted for 50%. Dalian road plant community landscape in the overall level remained to be further improved.4. The public are highly satisfied with plant dispositon of Dalian road green space, and only 18% dissatisfied.52% of people think that the ecological benefits of plant communities are more important than the visual landscape; 58% of people express satisfaction with the color composition of Dalian road green space; only 16% of people thought that better reflected the characteristics of Dalian.5.Color values of 45 common species in Dalian road greening concentrated in the three kinds of color systems of green, red, yellow. The color scope of green was S3060-G40Y-S7020-G30Y, accounting for 73% of the total colors. The color scope of red was S0530-R50B-S8010-Y90R, accounting for 20%. The color scope of yellow was S0550-G90Y-S1075-G80Y, accounting for 7%.6. The formal beauty of planar constitution of road greenland in Dalian are as follows:the tree layer's manifestation is diversified, including natural style, regular style, isolated and cluster planting; shrub layer is mainly in the form of patches planting, with the uniform or non-uniform distribution; the planar form of topiary plant are mainly natural flow and plaque composition, in the natural combination with trees, shrubs, herb layer, forming a beautiful, balanced planar constitution; the community is mainly as the front view of the planar form of herb layer in the natural type, fused and infiltrated with topiary plant and richly varied.7.The existing problems of its plant disposition are summarized, and six proposals adapt to construct plant landscape of road green space are put forward,11 optimise modes suitable for Dalian road green space are summarized.