Study On Animal Habitats And Their Ecological Corridors In Densely Built-up Urban Areas

The process of urbanization is often accompanied by fragmentation of urban habitat patches,imbalance of wildlife communities,and reduction of biodiversity.As the core area of high-density urban development and construction,the densely built-up urban area is the peak area of human intervention in the ecosystem,and the phenomenon of encroachment on the functional structure of green space is more significant,and the urban life support system is seriously threatened.Based on the above understanding,based on the theory of landscape ecology and symbiotic city,this paper takes the dense built-up area of Chengdu city as the research object,integrates the literature analysis method,field research method,software simulation method,and combines Fragstats4.2,GIS10.5,Linkage Mapper and other software to carry out the research of wildlife habitat characteristics in dense built-up area of the city and ecological corridor The network system was constructed,and the corresponding urban life support system optimization strategy was proposed.The main research contents of this paper are as follows.Firstly,we summarize the inherent characteristics of densely built-up urban areas,extract the measurement indexes corresponding to their characteristics respectively,construct a nighttime light data correction model applicable to the extraction of densely built-up urban areas by integrating each measurement index,and effectively extract the spatial boundaries of densely built-up urban areas by using the breakpoint analysis method.We also analyzed the basic behavioral characteristics of each animal species,such as feeding,roosting,nesting,and migration,and summarized the common plant species,food sources,and native characteristics in the densely built-up areas of Chengdu by using long-term animal observation data and habitat research data.Secondly,based on the field research data and literature,we constructed a comprehensive classification system for habitats in densely built-up areas of Chengdu,and deconstructed five major habitat types: woodland,shrub,grassland,hard and water,and clarified their vegetation composition,animal types,typical plant community patterns,ecological chain network and internal ecological processes.Finally,the quality evaluation and landscape pattern evaluation of each habitat type in the dense built-up area of Chengdu City were carried out by using research data and Fragstats 4.2.Then,the ecological corridors were constructed by integrating the minimum cumulative resistance model(MCR model),landscape pattern analysis model,multi-criteria evaluation model and kernel density analysis.The core habitats were mainly delineated from two criteria layers,habitat quality characteristics and habitat structure characteristics,and a total of five indicators were selected: habitat quality indicators,patch area indicators,patch edge indicators,patch shape indicators,and patch proximity indicators to jointly construct a habitat patch suitability assessment model and identify core habitat patches with high ecological suitability.After that,the composite resistance surface was generated by integrating habitat selection,dispersal effect and human disturbance elements.Finally,the Linkage Mapper module is applied to construct the ecological corridor network system in the dense built-up area of the city and carry out the key point identification of habitat patch importance evaluation,ecological corridor importance evaluation,ecological network evaluation,ecological pinch points and ecological obstacle points.Finally,based on the research results of urban habitats and ecological corridors,the life support system of dense built-up areas in Chengdu is optimized at two levels: overall structural optimization and local habitat quality improvement.The overall structural level is to optimize the regional ecological environment in three aspects: ecological skeleton construction,ecological vein extension and ecological capillary shaping.On the other hand,the local habitat quality improvement is based on the urban function to guide the construction of zoned habitats,and then the forest,water and hard habitats in the urban habitat classification system are used as the optimization targets,and appropriate ecological transformation methods are proposed for different habitat types.