[Multi-scenario Simulation and Evaluation of Lanzhou City Ecological Network Based on PLUS-MSPA and Spatial Syntax]

Against the backdrop of high-quality urban development， ecological risks are becoming increasingly severe. However， the construction system of ecological networks in ecological transition zones， such as semi-arid areas， remains imperfect. Consequently， this study takes Lanzhou city， located in a semi-arid area， as a case study. By integrating the PLUS-MSPA model， circuit theory， and spatial syntax， it simulates and evaluates the ecological security pattern for the year 2035. The findings indicate that the ecological corridor exhibits a three-stage distribution across four development scenarios. The ecological priority scenario features the highest number of corridors and the lowest construction cost within the context of farmland protection. The space ecological priority scenario yields the best outcomes. Therefore， a multi-center compact network layout mode of "double coordination" is proposed. This mode addresses the shortcomings of the ecological network construction framework and the specific ecological planning within territorial space planning. It resolves the practical issues related to the development and transformation of ecological space in Lanzhou， expands the theory of ecological security， and offers data support and ideas for reference in the construction of ecological cities in semi-arid areas.