The Research On Characteristic Plant Landscape Of Road-greenbelt In Nanning City

Urban Road is the "artery" and "lifeline" of a city. The road green space which is an important part in urban green space system, constitutes the green framework of city. Scientific and rational way to create a landscape of plants, can build a good image of the city, but also provide a sound ecological, beautiful, friendly and pleasant, the rich local cultural characteristics of the environment for the urban residents. Therefore, the study of urban road plant landscaping plays an important role on the sustainable development of Nanning City plant landscape and plants landscape construction in modern urban.The object of research mainly concentrates on the 32 urban trunk roads which include in the layout structure of "one-ribbon, two-axis, four-ring" of Nanning. In these roads, there are some plant communities which are relative stabled have been investigated. Firstly, the paper surveys and analyzes plant composition, application frequency, ornamental characteristics, ecological structure of road green, and summed up the characteristics of Nanning road greenbelt. Secondly, it studies characteristic plant landscaping in five aspects:defining the keynote of Nanning urban characteristics, and summarizing the status of Nanning's landscape characteristics; analyzing the plants'stylistic characteristics according to the plant itself and applying them; probing deep performance symbols of the national culture and their application methods in the road green spaces; Analyzing national colors in order to find the main road tone in road green belts;dividing into five characteristics of the regions according to the characteristics of urban space, and helping determine the theme of road greening design. Finally, For the example of the Yinhai Road design, the characterization techniques of plant landscape were used in that case, and writers make further progress in optimization for road-greenbelts in order to enhance and improve the urban green space landscape plants.The results show as follows:1. Nanning urban roads are abundant in species and totally have 157 species which belong to 58 families and 115 genera in 73 Standard segments. These species are accounted for 7.76 percent in species of Nanning.And the plants is concentrated on few and single families in sample plots. And Caesalpiniaceae, Moraceae, Palmaceae, which are world's big families occupy a relatively large proportion.2. The constructive species and dominant species are abundant in Nanning road-greenbelts, but most types of applications is still not widely. Whether tree or shrub layer, the use of high frequency mainly concentrates on a few species.3. In communities of Nanning road-greenbelts, the vertical structure of plant community is mainly combined with arbor, shrub and herbaceous. The frequency of the vertical structure in multi-level is 89.89 percent, and the single-layer vertical structure is 11.11 percent.4. There are 27 mainly ornamental flower, which is focused on the arbor layer and herbaceous layer. There are 9 ornamental fruit plants, which is focused on the arbor layer, and the fruiting period during the fall. There are 52 kinds of foliage plants, which are belong to Moraceae, Palmaceae. Colorific plants and autumn leaves plant occupy small proportion, and their seasonal change is not obvious.5. Nanning city has Typical tropical landscape features are, and has a profound national culture, and is the place where the convergence of ASEAN.6. The features of Situation in Nanning road-greenbelts show the landscape of the typical tropical plants, "fruit trees plant on streets" and the "tropical rain forest". At the same time, there exists the plant-landscape of Zhuang Gather Type.7. Nanning plant has a "dynamic", "static" and other special character, Guangxi Zhuang has rich cultural features, which is proposed with "refined", "reservation", "symbol", "metaphor" used in the road green belts.national colors have distinctive characteristics, and the red is proposed as the road's main colors in Landscape Planning. Nanning City has the five characteristics regional style, so different plant landscape design ideas are combined. Finally,using the findings into the design of the plant landscape.8.There are some approaches of optimizing the structure of road-greenbelt including utilizing the cultural elements, decorating with the regional characteristics, highlighting the urban atmosphere with color, using the species with the principles of sustainable development;insisting on the priority development of native tree species; selecting the suitable variety to preventing from disastrous weather and constructing the quality project.