长江上游水源涵养区界定及生态安全影响因素分析

Delimitation of water conservation areas in the upper Yangtze River and analysis of influencing factors on eco-security

对长江上游水源涵养区进行了详细地划分,采用生态系统内外部指标相结合的方法,建立界定指标体系,以界定模型结合ArcGIS空间分析模块的手段,界定出重点水源涵养区.结合研究区实际情况,根据压力-状态-响应(P-S-R)框架模型建立了多层次结构的生态安全评价指标体系.运用层次分析-向量相似度-主成分投影法对重点水源涵养区生态安全状况进行评价.针对评价结果,采用灰关联分析方法进行研究区生态安全影响因素关联度综合分析.研究结果表明:影响研究区生态安全的主要因素是降雨量、GDP增长率、水资源有效利用率、植被覆盖度和水环境质量.

In order to partition water conservation areas in the upper Yangtze River, inner and external indexes in an ecosystem were used to constructed a delimitation index system, and the key water conservation areas were delimitated by the delimitation model in combination with the ArcGIS Spatial Analyst. Based on the actual situation of research areas, a multi-level and multi-structure index system for eco-security assessment was built with the PSR （pressure-state-response） model framework. Eco-security assessment of the key water conservation areas was carried out by a combined application of AHP （ analytic hierarchy process） , vector similarity and principal component projection method. Gray correlation was added in finding out the main influencing factors on regional eco-security. The results show that these main factors are rainfall, increase rate of GDP, effective utilization rate of water resources, vegetation coverage, and water environmental quality.