[Ecological Sensitivity Evaluation of Three-River-Source National Park Based on CRITIC Objective Weighting Method]

Ecological sensitivity assessment is a probability assessment that intuitively reflects the potential ecological and environmental risks in a region under ecological imbalance. Utilizing ecological sensitivity assessment enables the precise identification of sites and areas that require priority environmental construction and protection, allowing for targeted conservation efforts in these regions. To effectively measure the comprehensive impact of environmental changes and human activities on the ecosystem of the Three-Rivers-Source National Park, as well as to explore the key areas where regional ecological issues occur, the following steps are taken： First, based on the location characteristics and ecological background of the Three-Rivers-Source National Park, a multi-dimensional evaluation index system was quantitatively constructed, including topography, climate, soil, vegetation, species, water resources, and human activities. Second, the CRITIC objective weighting method was used to comprehensively evaluate the ecological sensitivity of the Three-Rivers-Source. The CRITIC objective weighting method fully considers the magnitude of indicator variations and the correlations between indicators. Compared to subjective weight assignment methods, it is better able to reflect the influence of evaluation factors on comprehensive weights, thereby further enhancing the accuracy of the data, which is also an innovative aspect of the study. Finally, the GeoDa software was used to conduct spatial autocorrelation verification analysis on the evaluation factors of ecological sensitivity and to discuss the zoning of protection and management areas. The results showed： ① The buffering distance of wildlife habitats, land use types, and elevation were the three factors with the highest weights in evaluating the ecological sensitivity of the Three-Rivers-Source, with weights of 7.501%, 7.38%, and 7.189%, respectively. ② The Three-Rivers-Source National Park was categorized as having a moderately sensitive ecological status. The comprehensive sensitivity of the study area increased from the northwest to the southeast. The composite sensitivity index ranged between 1.65 and 4.00, with areas of high and very high sensitivity accounting for more than 50% of the total area. These regions were predominantly characterized by the presence of lakes, rivers, and vegetation conservation areas, as well as high-altitude areas, which were frequent sites for ecological issues. ③ The evaluation factors of ecological sensitivity in the Three-Rivers-Source National Park showed significant spatial autocorrelation and high spatial clustering, distributed in a contiguous and cohesive pattern on the spatial level. Hotspots that require priority ecological management were mainly concentrated in the Lancang River and Yellow River source areas. The purpose of the study was to explore the theory and methods of ecological environment protection in the Three-Rivers-Source National Park. The research results can provide reference for ecological protection and sustainable development in the park, ensuring that the ecological environment and socio-economic aspects develop in an orderly and coordinated manner, effectively promoting the formulation of zonal protection management measures.