Construction and Optimization of a Green Infrastructure Network in an Island City Based on the MSPA-MCR Model: A Case Study of Lingkun Island

Island ecosystems face severe threats to their ecological integrity from rapid urbanization due to their inherent fragility. To address this, this study presents a systematic framework for constructing and optimizing a Green Infrastructure (GI) network on Lingkun Island, a rapidly developing island city, to enhance its ecological resilience. The framework integrates Morphological Spatial Pattern Analysis (MSPA) with the Minimum Cumulative Resistance (MCR) model. MSPA was first employed to identify 31 core ecological source habitats, totaling 87.74 hm2, which are predominantly concentrated along the island’s vital coastal and intertidal zones. Subsequently, the MCR model was used to delineate an optimized network of ecological corridors connecting these sources. A comparative analysis demonstrates that the planned GI network exhibits substantial structural improvements over the current landscape: the number of corridors increases from 39 to 68, while the average corridor length decreases significantly from 1584 m to 1078 m. These structural enhancements translate to greater functional connectivity and system efficiency, mitigating habitat fragmentation. This research provides a scientifically robust and replicable methodology for ecological planning in highly developed island and coastal regions, offering a crucial tool to help balance urban expansion with environmental sustainability.