基于EVI的锡林郭勒生态脆弱性评价

The evaluation of ecological vulnerability of Xilingol based on EVI

本文基于综合指数法构建生态脆弱性模型,借助质心迁移、趋势分析对锡林郭勒近20年生态脆弱性的时空演变进行了分析,并探究了自然因素和社会因素对生态脆弱性的驱动影响及时空分异特征。结果表明:①时间上,锡林郭勒生态脆弱性整体有所改善、分区特征显著。矿区、牧区生态治理成效显著;农业区生态脆弱性出现退化,需加强治理。②空间上,锡林郭勒生态脆弱性呈阶梯式分布,生态脆弱性质心逐渐向东偏移。西部地区生态脆弱性持续改善;中、东部地区生态脆弱性相对平稳,局部地区出现退化。③自然因素对空间尺度下的生态脆弱性主导特征显著,社会因素对时间尺度下的生态脆弱性主导特征逐渐增强。

Based on the composite index method,this paper constructs an ecological vulnerability model.On this basis,we study spatio-temporal evolution of ecological vulnerability in the past 20 years by means of gravity transfer and trend analysis.What is following is the discussion on the driving influence of natural and social factors on ecological vulnerability and the characteristics of spatio-temporal distribution.Our major findings include:①In terms of time,the overall ecological vulnerability of the study area improves,and the disturbance partition feature is significant.The ecological management of mining and pastoral areas has been effective,while the ecological vulnerability of agricultural areas has been degraded and needs to be controlled further.②Spatially,the distribution of ecological vulnerability in the study area is in a stepped distribution and the center of gravity of ecological vulnerability gradually shifts to the east.The ecological vulnerability in western Xilingol has been continuously improves,and in the central and eastern regions it has been relatively stable,with degradation occurring in local areas.③As far as driving factors is concerned,the dominant characteristics of natural factors are significant on the spatial scale,and the dominant characteristics of social factors are gradually strengthened over time.