CONSTRUCTION OF URBAN BIODIVERSITY SYSTEM BASED ON ECOLOGICAL ATLAS

The acceleration of urbanization makes cities face many environmental problems such as the heat island effect and the reduction of ecological diversity. The sharp decline of biodiversity has become one of the most serious ecological and environmental problems in the world. Urban green space is an important urban habitat that can be preserved or reconstructed in the process of urbanization and is an important link in the protection of urban biodiversity. How to maintain and improve biodiversity has become an important part of today's eco-city construction. This study takes Xi'an as the research object and creates a set of vegetation structure factors (horizontal structure factor of vegetation, age factor of dominant vegetation species, vertical structure factor of vegetation, influence of tree type) through a combination of field research and indoor mapping. By comparing the species richness of vascular plants in green spaces with different vegetation structures, the validity of this classification system in the collection of urban and rural biodiversity information was tested to map the ecological unit map of the study area and analyze its landscape pattern. The total area of the study area is about 42.13 km2, including 38 ecological unit types and 1081 ecological unit patches. Among them, the gray space has the largest area, followed by the blue space. The green space occupies a smaller area and has a large density of patches, indicating that the green space has a higher degree of fragmentation. In the study area, the gray space covers a large area. Affected by the increasing shortage of land resources, urban construction land continues to occupy the urban green space construction space. Adjustment and replacement of planned green space occur from time to time. At the same time, the urban development method is to develop first. As a result, urban green space construction lags behind urban construction.