太原市域生态敏感性综合评价

Integrated assessment on ecological sensitivity for Taiyuan City

基于遥感和GIS技术,从"地"、"水"、"林"、"人"四方面,筛选坡度、水体、植被覆盖指数、生态保护区、土地利用类型五项生态敏感因子,对太原市域生态敏感的类型、程度及其分布进行综合评价与分析。结果显示:敏感度高的区域面积782.92 km^2,占总面积的12.11%,主要分布在市域北部阳曲县和西北部娄烦县的山地地区,这些地区山高坡陡,植被覆盖较好,有些被划为生态保护区,受多种敏感类型的影响;中度敏感区面积2955.07 km^2,占45.69%,主要是沿汾河干支流方向和高度敏感区周边的丘陵低山地区,水体是最为主要的敏感类型,此外,地形、植被及人类的土地利用都对其具有一定的影响。从研究结果来看,太原市域生态敏感类型多样,且在空间上交错分布,具有明显的空间地域差异,能为政府在区域开发中制定科学的生态安全防范策略提供有力的依据和参考。

Based on RS and GIS techniques, the ecological sensitivity types, degrees and their spatial distributions are studied in Taiyusal City. In this study, 4 factors such as land, water, forest and human, are considered; in order to integrate the 4 factors, 5 indices such as slope, water, vegetation coverage index, ecological protection area and land use type are selected for ecological sensitivity assessment. The results are as follows. 1） The high sensitive region covers an area of 78292 km2, accounting for 12.11% of the total rea. And the regions are located in mountainous regions of Yaxlgqu County, north of Taiyusxl City and Loufan County, northwest of Taiyuan City with steep slope and good vegetation cover. 2） The moderate sensitive region covers an area of 2955.07 km^2, with 45.69% of the total area. And the regions have two types： one is distributed along Fenhe River and its branches, the other one is located in hills and low mountains around the high sensitive regions peripherally. The results also show that the most important sensitivity factor is water-ecology. The outcome of this work may be utilized to protect the ecological securities and to develop more scientific ecological policy for Taiyuan city.