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基于GIS的龙凤湿地省级自然保护区生态敏感性评价

Ecological sensitivity evaluation of Longfeng Wetland Provincial Nature Reserve based on GIS

  • 摘要: 生态敏感性评价对于区域环境保护与制定功能分区有着重要作用。选取高程、坡度、坡向、植被覆盖度、水域缓冲区、土地利用类型、道路缓冲区和居民点8个指标,构建生态敏感性指标评价体系,采用层次分析法与GIS空间分析法,对龙凤湿地省级自然保护区进行生态敏感性评价。研究结果表明,龙凤湿地整体生态敏感性较低,以比较敏感区为主,不敏感、比较敏感和极度敏感区面积分别占龙凤湿地面积的39.5%、46.4%和14.1%,极度敏感区域集中分布于研究区东北部和中部的芦苇沼泽湿地,此外,西南部的泡沼也有集中分布。比较敏感区域分布于极度敏感区域的外围,其他为不敏感区,主要分布于研究区边缘。敏感程度的空间变化基本规律为沿保护区中心水体向四周进行衰减。植被覆盖度与水域缓冲区因子对生态敏感性贡献程度最大;在评价结果的基础上,提出环境保护与生态建设的相关建议,为湿地生态的保护与湿地景观的规划提供参考。

     

    Abstract: Ecological sensitivity assessment plays a crucial role in regional environmental protection and the formulation of functional zoning. Using GIS, an ecological sensitivity assessment was conducted on the Longfeng Wetland. Eight indicators elevation, slope, slope aspect, vegetation cover, water body buffer zone, land use type, road buffer zone, and settlement were selected to construct an ecological sensitivity evaluation system. The Analytic Hierarchy Process (AHP) and GIS spatial analysis were employed to assess the ecological sensitivity of the study area. The results indicate that the overall ecological sensitivity of the Longfeng Wetland is relatively low, with a predominance of moderately sensitive areas; vegetation cover and water body buffer zones have the greatest influence on ecological sensitivity; non-sensitive, moderately sensitive, and highly sensitive areas account for 39.5%, 46.4%, and 14.1% of the Longfeng Wetland's total area, respectively; highly sensitive areas are concentrated in the northeastern and central parts of the study area, primarily in reed marsh wetlands, with additional concentrations in the southwestern part's bog wetlands. Moderately sensitive areas are distributed around the periphery of highly sensitive areas, while the remaining areas are non-sensitive, primarily located along the edges of the study area. The basic spatial pattern of sensitivity is a gradual decrease from the central water body of the protected area outward. Based on the evaluation results, relevant recommendations for environmental protection and ecological construction are proposed to provide reference for the protection of wetland ecology and the planning of wetland landscapes.

     

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