Study On Plant Landscape Evaluation And Optimization Of Low-impact Development Facilities

In recent years,with the problem of urban rainwater environment,the concept of lowimpact development technology and sponge city has been paid more and more attention in China.And their corresponding green facilities have been developed and applied in the construction process.However,these technical measures for sponging have not been well integrated with landscape design,and the research is mostly focused on the engineering level.As an important element,the plants in the low-impact development facilities have not played their role well,and the research on species selection and allocation methods and landscape effects is relatively lagging behind.As a result,in the process of construction of sponge cities,it is impossible to scientifically and reasonably allocate plants in the low-impact development facilities,and thus the lack of systematical and targeted consideration and design would restrict the construction and development of sponge city to a certain extent.By studying the plant landscape and allocation of typical low-impact development facilities and facilities such as biological detention facilities and grass planting ditches in Beijing sponge projects,this paper summarizes the plant application types and allocation modes of 72 typical low-impact development facilities in Beijing.Secondly,through AHP analytic hierarchy process,the plant landscape evaluation model of low-impact development facilities was established according to the weights of experts' scores from three restricted aspects including plant ecology,rainwater function and landscape ornament to ten accurate aspects including 10 evaluation factors,And the plant landscape of 9 typical facilities was then graded and evaluated.The problems in plant landscape of typical low-impact development facilities were summarized and the better samples were selected for analysis.Based on the evaluation and analysis,the principles of plant selection and allocation for low-impact development facilities in Beijing are put forward,and some plant species that can be applied to low-impact development facilities in Beijing are summarized according to the relevant literature.The optimal allocation mode and the method of plant maintenance and management for typical lowimpact development facilities are put forward.The research combines the cross-background of low-impact development and plant landscape,optimizes the plant landscape of low-impact development and construction rationally so as to provide reference for the plant landscape application of low-impact development facilities in Beijing,and provide theoretical basis and experience for further construction of sponge cities in China.