Study On The Design Of Groundcover Plant Community Of Bioretention In Fengxi New City Sponge City

Bioretention is an optimal urban rainwater management measure constructed at micro-scale in sponge city construction.It is favored by many people because of its flexibility and aesthetics in design scale,arrangement and structure.Among them,plant selection and reasonable design are the key to the function of bioretention.In the construction of sponge city in fenxi new town,biological retention facilities,as widely distributed and abundant heterogeneous patches of habitat,provide opportunities for the construction and restoration of urban biological habitat,and also put forward more requirements for plant species selection and collocation.This paper puts forward the design method of biodetention facility cover plant community,aiming to explore the habitat construction method of biodetention facility from the perspective of landscape architecture,which is of positive significance to the construction and development of sponge city.Firstly,by combing the relationship between biological retention facilities and ground cover plants,the related ecological principles of ground cover community design were summarized,and the design concept of ground cover community of biological retention facilities was put forward.Secondly,the selection and fabric methods of groundcover for the functional requirements and habitat characteristics of biological retention facilities are discussed,which involve two aspects.First,based on the perspective of influencing plant planting design,biological detention facilities are divided into landscape dominant,functional dominant and comprehensive biological detention facilities.The stratified random sampling method is adopted to investigate and study the ground cover plants of the biological retention facilities in fengxi new town for three consecutive months in the rainy season.Secondly,based on the methods of ecological theory research and natural prototype survey of groundcover,the parameter characteristics of the design of groundcover community in northwest China are summarized.The spatial fabric,temporal fabric and functional fabric methods of groundcover are expounded from the perspective of biological retention facilities and landscape.Different dominant fabric patterns of ground cover community were proposed.Through the experimental study in the greenway of fenxi new town center,the design method and key points of the ground cover community of biological detention facilities are explained in detail,and 12 kinds of ground cover fabric patterns are tested by simulating the "habitat island" model of biological detention facilities.Through two years of data observation and analysis,its stability was evaluated and screened.In the end,the design procedure of cover plant community of biological retention facilities is summarized,and the design method of cover plant community of different types of construction land in fengxi new town and the related fabric pattern of cover plant community are put forward.The main research conclusions are as follows: 1).The main research conclusions of this paper are as follows: the design conception of biological retention facility cover plant community in sponge city construction is put forward;2).The evaluation and selection of 50 kinds of bioretention facility cover plants in fengxi new town were carried out.3).The key parameters of the plant cover community design of biological detention facilities and the combinations of four dominant types of plant cover communities were extracted.4).The design process,application method and extension way of bioretention plant cover community were summarized.