基于GIS的金庭镇生态敏感性评价

An Assessment of Ecological Sensitivity of Jinting Town Based on GIS

生态敏感性分析可为区域水环境治理规划提供一定参考。利用GIS对金庭镇进行生态敏感性评价,基于地形因子、植被覆盖情况、水系分布情况,选取高程、坡度、地形起伏度、植被覆盖度和主要水系距离5个评价指标构建生态敏感性评价指标体系,采用层次分析法通过多因子加权模型分析金庭镇综合生态敏感性评价。结果表明:山区等地势较高、坡度较陡、地形起伏程度大且植被覆盖率高的区域生态敏感性较高,极高敏感区及高敏感区占比约35.52%,该区域应以自然修复为主,减小开发力度;圩区、城镇等地势平坦区域多为中低敏感区,中低敏感区域占比约54.27%,在符合上位规划要求的情况下可开展河道驳岸生态化改造等工程,因地制宜开展水环境修复措施。研究结果可为区域水环境治理规划提供参考。

Ecological sensitivity analysis can be a reference for regional water environment management planning.Using GIS to evaluate ecological sensitivity of Jinting Town,based on topographic factors,vegetation cover condition and water system distribution,five evaluation indicators of elevation,slope,relief amplitude,NDVI and water buffer zone,were selected to construct an ecological sensitivity evaluation index system,and the hierarchical analysis was used to analyze the comprehensive ecological sensitivity evaluation of Jinting Town through a multi-factor weighted model.The results of the study showed that:1)Regions with high terrain,steep slopes,large terrain fluctuations,and high vegetation coverage,such as mountainous areas,have higher ecological sensitivity.The proportion of extremely sensitive and highly sensitive areas account for about 35.52%,and natural restoration should be the main approach to reduce development efforts;2)Flat areas such as polders and towns are mostly medium to low sensitive areas,moderately sensitive and fairly sensitive areas account for about 54.27%,hence in compliance with the requirements of upper-level planning,projects such as ecological restoration of river revetment can be carried out to a certain extent,and water environment restoration measures can be carried out in these areas according to local conditions.The results provide reference for further water environment management planning.