The Primary Research On Interchange Greenspace Landscape Of Expressway In Hunan Province Based On Ecological First

Green land of interchange of expressway is a vital part of landscape and is also an important node in landscape design. Good site conditions and strong plasticity have created favorable conditions for its ecological restoration. However, judging from the existing situation of interchanges, lack of ecological awareness, ignore natural conditions and serious urbanization design is a common problem. This study took field visits to11interchanges in Ruchen Expressway and Changzhu Expressway from the point of view of ecological priority, take theoretical discussions on landscape design of interchanges in Hunan Expressway and then apply these to actual cases. All the research findings are as follows:The research findings show that:①Green lands of interchanges of expressway in Hunan province have diverse terrains, such as slopes, plains, hills and valleys. These diverse terrains create a variety of biological environment for creatures. On one hand, it benefits the formation of biodiversity, on the other hand, it benefits the accumulation of rainwater in interchange.②Due to interchange of expressway is far from city, post-maintenance is difficult and site environment is more severe. Lauraceae and Apocynaceae grow well due to strong stress tolerance, but Poaceae, Asteraceae and other species with strong self-derivative ability encroached plant space.③The main elements of interchanges of expressway are terrains and plants. Protection and remodeling of terrains and choice of vegetation and configurations are essential parts of interchange of expressway.Under the influence of surrounding environment, geographical features and overall landscape of roads and traffic safety, interchange design should aim at "natural, native, protect and restore". In addition to traffic safety and landscape logo, ecological resilience, ecological aesthetics are also important. Maintaining ecological balance of the original lands, respect laws of ecology, and make scientific design through choosing local materials and build growth framework to create recovery space.Starting from the ecological priority, terrains of expressways propose protection of original terrains, and transform methods of lopes, plains, hills and valleys. This study mainly choose Hunan native plants, rough management plants, wild plants and fast-growing pioneer species. As to plant configurations, flower sloping, plant community, thickset and wetland can be adopted. Accumulation of rainwater could take seasonal pool depression, stability water storage pond and invisible drainage system.Apply the research theory into practice of the design of green land of interchange of expressway from Liling to Chaling.