Research On The Design Of Low Maintenance Ecological Roof Greening Based On Habitat Construction

With the rapid development of urbanization,urban green space structure is unbalanced,and various urban environmental problems are constantly appearing.The shortage of land resources available for greening construction in cities is a restrictive factor hindering the healthy development of urbanization.Optimization and promotion of green space stock has become an important strategy for urban environmental optimization.Roof greening can increase urban greening area and effectively alleviate urban ecological problems.However,roof greening in Xi ’an has some serious practical problems,such as high construction and maintenance cost,insufficient ecological function,simple and poor planting mode,and poor adaptability of plant habitat.In view of the above background,this paper puts forward the concept of low maintenance ecological roof greening and describes its design methods.It integrates "roof habitat + ground cover plant community" and proposes three design modes for specific design objectives,which can effectively improve the urban ecological benefits and landscape value of roof greening and has the potential to be popularized.First of all,this article summarizes the habitat build related theory,generalizes the habitat factor affecting roof,also for low maintenance ecological concept,typical cases and design key points of roof garden,fabric cover plant community were studied,the theoretical is presented based on the habitat build low maintenance ecological type of roof greening design theoretical framework.Secondly,a theoretical method for evaluating low-maintenance ecological roof greening site was constructed from three aspects: matching of roof bearing capacity and design form,classification of roof greening application site type,and classification of roof habitat type.Meanwhile,according to the ecological and landscape function orientation of low-maintenance ecological roof greening,Three typical construction objectives of low maintenance ecological roof greening were extracted from the ecological level and the landscape level,and the influencing factors were summarized and analyzed with the method of literature review,and the influencing factors were evaluated,which served as the basis for the design research under the multi-objective orientation.Thirdly,on the basis of site evaluation,this paper studies the basic design method of low maintenance ecological roof greening from four aspects,such as structure form,planting substrate,irrigation system,and plant selection and configuration,through case study and theoretical research method,and proposes the selection and optimization of design method for multi-objective orientation.Finally,the design method of summary and induction,this paper puts forward the rain delay leading,biological diversity and landscape effect promotion leading storage of three typical design patterns,expounds the characteristic of the applicable conditions of the roof,roof greening and being western new city culture park project for practice case,three patterns in landscape architecture planning and design stage has carried on the theory of practical application,The targeted benefits of the programme are also pre-assessed.The main conclusions of this paper are as follows:(1)The concept of low maintenance ecological roof greening is put forward;(2)The evaluation methods of low maintenance ecological roof greening site are summarized,and three typical targets and their influencing factors are analyzed.(3)The low maintenance ecological roof greening design method based on habitat creation was summarized,and three design modes under the guidance of goal were put forward.(4)Based on practical cases,the technical process and basic ideas of design pattern application are summarized.