Construction and Optimization Strategy of County Ecological Infrastructure Network Based on MCR and Gravity Model—A Case Study of Langzhong County in Sichuan Province

Against the backdrop of rapid urbanization, there is a passive adaptation state shown in urban and rural ecological spaces. Due to shrinking patches fracture corridors, problems such as obstruction processes, decline ecosystem services, loss biodiversity occur. Considering that county space key level undertake provincial security patterns implement demonstration projects, construction infrastructure (EI) network beneficial protection regional security, improvement structures functions farmland ecosystems, enhancement quality human settlements. In this study, taking Langzhong County Sichuan Province an example, method path for EI was explored, optimization strategy proposed. Firstly, morphological spatial pattern analysis (MSPA) patch importance index were employed identify sources. Secondly, by constructing landscape resistance surface adopting minimum cumulative (MCR) model, potential corridor paths extracted. Thirdly, interaction force values between sources calculated with gravity model important corridors identified priority restoration. Finally, optimized combining structure indexes (α, β, γ) field situation, stepping stone breakpoints identified. Based on results, pattern, which involved three vertical two horizontal belts, four control zones, six clusters networks County, put forward, aiming at protecting 50 sources, repairing 105 different grades, adding 9 near long-distance 15 intersection 18 breakpoints. This study has guiding significance patterns, forest site selection restoration projects.