Spatial Configuration Mechanism of Rural Tourism Resources Under the Perspective of Multi-Constraint Synergy: A Case Study of the Nujiang Dry-Hot Valley

To address social challenges arising from extensive exploitation of rural tourism resources—including degradation of natural ecosystems and erosion of ethnic cultural heritage—this study establishes a synergistic assessment framework constrained by habitat quality, resource endowment, and facility accessibility. By integrating the InVEST model, kernel density function, and cumulative cost distance algorithm, we developed a spatial overlay analysis tool to evaluate these three dimensions in the dry-hot valley of Lujiang Dam (LJD) within China's Nujiang River Basin. This approach identified natural spatial suitability for tourism development (NSSTD). Key findings reveal that LJD exhibits high overall habitat quality (844.88 km², 64.55% of total area), yet demonstrates pronounced spatial heterogeneity—prime habitats concentrate in western and southeastern sectors, contrasting with a central low-quality habitat belt. Natural/cultural resources display a barbell-shaped spatial configuration, clustering at southern and northern extremities. Tourism accessibility manifests concentric spatial patterns, with 88.08% of resources accessible within 90-minute travel thresholds. NSSTD zones (54.74 km²) predominantly located in southern LJD encompass 17 land-use types and 70.73% of villages. These results provide critical spatial decision-making support for: Sustainable tourism resource management in dry-hot valleys, precise village planning, territorial spatial optimization strategies. The methodology demonstrates operational value in balancing ecological conservation and rural development priorities.