Research On Habitat Structure Characters Evaluation Of Urban Green Stormwater Infrastructure

The rapid expansion and high-density development of urban construction land has led to the continuous degradation of urban ecosystem services.Green stormwater infrastructure facilities show richer site biodiversity,because rainwater habitats have higher heterogeneous micro-habitat characteristics than general garden green spaces,the current sponge city construction in full swing is an opportunity to improve the urban site habitat and increase biodiversity.Habitat structure characters are physical structures or spatial features that directly affect the habitat of organisms and are ecologically exposed in the environment.This research starts from the perspective of habitat structure and biodiversity,and uses the characteristics of habitat structure to comprehensively understand and grasp the relationship between the landscape characteristics of the site habitat and the diversity of animals and plants.Explore the characteristics of green stormwater infrastructure habitats and establish a habitat structure heterogeneity evaluation model,in order to simply and effectively evaluate and analyze the current situation of site habitats and biodiversity.First,on the basis of combing the related literature on green stormwater infrastructure habitat creation,animal and plant community characteristics,and analyzing various green stormwater infrastructure structure and habitat characteristics,it is concluded that Plant growth forms,Leaf height,Vegetation coverage,Topographic structure and Material 5 major first-level characteristic indexs and 16 second-level characteristic indexs in the project,further analyze and summarize various feature factors that reflect the characteristics of site landscape design and directly affect the habitat of animal and plant communities under the second-level indicators,and establish green stormwater infrastructure habitat structure characteristics Index system.Next,a total of 131 quadrats of 32 green stormwater infrastructure habitat plots in the Sponge City Construction Qingshan Demonstration Area of Wuhan City were analyzed for the habitat structure characteristics.The results showed that in addition to ecological bulkhead,storage facilities with permanent water such as wet pond and rainwater wetland have the highest average feature richness.In terrestrial or semi-aquatic habitats,rain garden has the highest average feature richness,followed by grassy swale,ecological dry stream,and infiltration pond,,sunken greenland is the lowest.The vegetation structure of the green stormwater infrastructure is dominated by low shrubs and herbs in the middle and lower layers.The vegetation community of tall grass ornamental grasses and low shrubs or herbs is the most typical rainwater habitat landscape type.The rolling terrain and abundant stone materials are also common structural elements and landscape features of green stormwater infrastructure habitats,but there is very few distribution of artificial organic mulch.Then,on the basis of the index system of habitat structure characteristics,Then,on the basis of the index system of habitat structure characteristics,through principal component analysis,correlation analysis and expert questionnaire survey methods to identify and screen the key structural characters in the habitat that have a positive effect on biodiversity,and construct the green stormwater infrastructure habitat structure heterogeneity Evaluation model.The evaluation of 32 habitat plots found that the overall heterogeneity of the green rainwater facility habitat structure under green stormwater infrastructure technology in Qingshan Demonstration Zone in Wuhan is at a medium level.Finally,in view of the problems of single vegetation structure in some facilities,homogeneity of vegetation types,relatively simple topographic structure,and insufficient material types found in the investigation and analysis of green stormwater infrastructure habitats,according to the five basic principles of functionality,landscape aesthetics,people-centeredness,nature-approximating,and co-evolution that need to be followed in the green stormwater infrastructure habitat-site design,this research proposes corresponding habitat optimization strategies,and summarizes the suitable animal target species in the construction of various typical green stormwater infrastructure habitats,further from the three habitat structures of terrain structure,material and vegetation community explain the main points of the optimal design of habitat.