基于AHP-GIS统计的溪洛渡镇生态敏感性空间评价

Spatial evaluation of ecological sensitivity of Xiluodu town based on AHP-GIS

以溪洛渡镇为研究对象,结合国内外相关研究现状、实地勘察以及矢量数据,选取海拔、植物郁闭度、土壤侵蚀、地类、坡度、坡向、石漠化7个评价指标作为评价机制,并通过AHP法对评价指标进行权重分析,最后运用ArcGIS空间分析法进行叠加分析。分析结果显示,溪洛渡镇生态敏感性呈阶梯状,自北向南呈现敏感度递增趋势;南部、东南部以及西南部为中高度敏感,北部沿金沙江区域多为轻度敏感区;轻度敏感区、中度敏感区及高度敏感区所占比例总和为99.92%,说明溪洛渡镇的总体生态敏感程度相对较高;造成生态敏感性的主要因子有石漠化、郁闭度、土壤侵蚀、海拔。该研究结果可对金沙江流域周边城镇生态环境保护以及生态修复方案的建立提供借鉴性的理论探索和建议。

Xiluodu town was taken as the research object,combining with the related research status,field survey and vector data at home and abroad,seven evaluation indexes were selected as the evaluation mechanism,including altitude,plant canopy density,soil erosion,land type,slope,slope direction and rocky desertification,and the weight of evaluation indexes was analyzed by AHP method,and finally the spatial analysis method of ArcGIS was used for overlay analysis.The results showed that the ecological sensitivity of Xiluodu town was in the form of ladder,increasing from north to south.the south,southeast and southwest of Xiluodu town are of medium high sensitivity,and the area along Jinsha River in the north was mostly of light sensitivity.the proportion of light sensitive area,medium sensitive area and high sensitive area was 99.92%,indicating that the overall ecological sensitivity of Xiluodu town was relatively high.The main factors of ecological sensitivity were rocky desertification,canopy density,soil erosion and altitude.The research results can provide theoretical exploration and suggestions for the ecological environment protection and the establishment of ecological restoration scheme in the surrounding towns of Jinsha River Basin.