基于层次分析法的伊金霍洛旗生态脆弱性评价

Evaluation of Ecological Vulnerability of Yijinhuoluo Banner Based on AHP

以内蒙古伊金霍洛旗区域为研究对象,基于层次分析法,进行生态脆弱性评价。利用SRTM 30m分辨率的DEM数据和2017年7月份landsat 8遥感影像得到海拔、坡度、植被盖度、土壤侵蚀模数4个评价指标,采用层次分析法确定因子权重,并计算出生态脆弱性指数,确定生态脆弱性分区。结果显示:一般区域面积占比6. 78%,主要分布在中部和南部的水源聚集区域;低度脆弱区域面积占比68. 53%,主要分布在东部,南部,东北部,中部偏西区域的大部分;中度脆弱区域面积占比24. 29%,主要分布在伊金霍洛旗北部,西部和东北部少部分区域;重度脆弱区域面积仅占0. 4%。生态脆弱区域在雨季应注意防范水土流失和山洪灾害,旱季应注意防风固沙和寒潮冻害等。

Based on the analytic hierarchy process(AHP),the ecological vulnerability assessment of Yijinhuoluo Banner region in Inner Mongolia was carried out.The DEM data with SRTM 30m resolution and landsat 8 remote sensing images in July 2017 were used to obtain the four evaluation indexes of altitude,slope,vegetation coverage and soil erosion modulus.The factor weight was determined by analytic hierarchy process(AHP),and the ecological vulnerability index was calculated to determine the ecological vulnerability zones.The results showed that the general area accounted for 6.78%,mainly distributed in the central and southern water aggregation region;The area of low-degree vulnerable areas accounts for 68.53%,mainly distributed in the east,south,northeast and west-central regions.The area of moderate vulnerable areas accounts for 24.29%,mainly distributed in the northern,western and northeastern parts of Yijinhoro Banner.Severe vulnerable areas accounted for only 0.4%of the total area.In the rainy season,attention should be paid to the prevention of soil erosion and mountain flood disasters in ecologically fragile areas,while in the dry season,attention should be paid to the prevention of wind,sand fixation and cold wave damage.