基于GIS的国家级生态县的生态敏感性评价以安徽省霍山县为例

Ecological Sensitivity Evaluation of National Ecological County based on GIS: Take Huoshan County of Anhui as an Example

  • 摘要: 以国家级生态县安徽省霍山县为研究对象,基于山地地貌特征,从自然、人文两方面,选取高程、坡度、坡向、地质灾害、水体、植被、道路、土地利用类型8个因子作为生态敏感性评价指标,将研究区划分为不敏感、低度敏感、中度敏感、高度敏感4个等级。利用层次分析法确定因子权重,运用GIS空间分析技术,得到霍山县域综合生态敏感性空间分布图。结果表明,霍山县总体生态敏感性程度较高,以中度敏感为主,占县域总面积的36.66%,高度敏感区占县域总面积的18.82%,同中度敏感区一样,二者集中分布于中部和南部山区;低度敏感区占县域总面积的28.24%,均匀分布于霍山县境内;不敏感区占县域总面积的15.28%,集中分布于北部地势平缓的丘陵地区。最后,在生态敏感性分析的基础上结合霍山县现状,针对不同敏感区提出相应的用地策略,以期推动霍山县生态环境的高质量发展。

     

    Abstract: Taking Huoshan County of Anhui Province, a national ecological county, as an research object. Based on the characteristics of mountain landform, eight factors, including height, slope, aspect, geological disaster, water body, vegetation, road and land use type, are selected as ecological sensitivity evaluation indexes from natural and human aspects. The study area is divided into four grades: insensitive, low sensitive, moderate sensitive and highly sensitive. Using analytic hierarchy process (AHP) to determine the factor weight, and using GIS spatial analysis technology, the spatial distribution map of comprehensive ecological sensitivity in Huoshan County was obtained. The results shows that the overall ecological sensitivity of Huoshan County is relatively high, with moderate sensitivity accounting for 36.66% of the total area of the county, and the highly sensitive area accounted for 18.82% of the total area of the county. The same as the moderately sensitive area, the two are concentrated in the central and Southern mountainous areas; the low sensitive area accounted for 28.24% of the total county area, evenly distributed in Huoshan County; the non sensitive area accounted for 15.28% of the total county area. They are mainly distributed in the hilly areas with gentle terrain in the north. Finally, on the basis of ecological sensitivity analysis, combined with the current situation of Huoshan County, the corresponding land use strategies are proposed for different sensitive areas, in order to promote the high-quality development of ecological environment in Huoshan County.

     

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