基于GIS的关中-天水经济区生态敏感性分析

Ecological Sensitivity Analysis of the Guanzhong-Tianshui Region Based on GIS

选取坡度、高程、土地利用类型、水域、植被覆盖指数(NDVI)5个敏感性因子,利用层次分析法(AHP)确定因子权重,以像元、行政区划、流域为单元,得到不同尺度上关中-天水经济区生态敏感性的空间分布。结果表明:关中-天水经济区高度、中度、低度和不敏感区面积占比分别为18.81%、31.61%、44.47%和5.11%;行政区划尺度中,生态敏感性最高的为商洛市,最低的为杨凌区;流域尺度中,生态敏感性最高的为乾佑河流域,最低的为渭河流域龙门至三门峡段和咸阳至潼关段。对研究区域生态环境提出分级保护与开发建议,为相关部门制定发展方略提供参考依据。

This article selected slope,elevation,land-use type,watershed,vegetation coverage index as eco-sensitive factors,and used analytic hierarchy process(AHP)to determine the weights of each eco-sensitive factor.The paper analyzed distribution of eco-sensitive situation in Guanzhong-Tianshui economic zone based on different spatial scales including pixel,administrative division and basin.The results show that the percentages of high sensitive area,moderate sensitive area,low sensitive area and insensitive area are 18.81%、31.61%、44.47%and5.11%respectively.Shangluo City is in the highest eco-sensitive situation,Yangling District is in the lowest eco-sensitive situation,and Qianyou Basin is in the highest eco-sensitive situation and Wei River Basin(Longmen to Shanmenxia Gorge and Xianyang to Tongguan)are in the lowest eco-sensitive situation.At last,the paper came out suggestion about eco-environment selective protection and construction for authorities in Guanzhong-Tianshui economic region.This study can provide a reference basis for related departments to formulate development strategies.