Establishing the Ecological Security Pattern of Jieyang City with GIS

In order to solve the ecological problems faced by the Chao-Shan area, such as environmental pollution, reduction of ecological sources, interruption of ecological corridors and fragmentation of ecological landscape, the urban ecological security pattern of Jieyang is constructed with the help of GIS spatial analysis technology. The index evaluation method is established to identify the ecological source and the minimum accumulated resistance model is used to identify the ecological buffer zone and ecological corridor. The following results are obtained. First, the identification of ecological source, corridor and buffer zone is the core of the construction of urban ecological security pattern. The ecological land is extracted effectively from the three aspects of biodiversity, water resources and soil state, and the identified ecological source area is 1 682.26 km², accounting for 32.11% of the total area of the region. The ecological source is C-shaped, with its scope basically coinciding with the spatial distribution of ecological function area. Second, the area of ecological buffer zone with low accumulated resistance is 2 751.02 km², accounting for 52.51% of the total area and the 21 ecological corridors add up to a total length of 845.23 km. Third, an ecological protection framework of "green barrier-ecological corridor-green network of farmland", can strengthen the development and connection of ecological sources, ecological buffer zones, ecological corridors and the built-up area and are of great significance to the region's ecological protection and sustainable development.