三峡库区水生态分区初探

通过分析国内外水生态分区、水环境功能分区现状,研究了各种分区指标选取依据及指标体系特点。通过对比三峡库区已有的生态功能分区依据及指标体系特点,提出了已有分区指标体系的不足之处,即尚未充分考虑水生要素。在三峡库区流域自然要素及水生态特征的分析的基础上,建立了三峡库区流域水生态分区体系.明确了各级分区的主要内容与分区依据,提出了各级分区的特征指标,从而建立了流域水生态分区的指标与方法体系。结果表明,三峡库区流域包括2级水生态区。该研究在GIS技术支持下,采用多指标叠加分析和专家判断方法,将三峡库区流域划分为6个一级区,对不同分区的水生态系统特征及其所面临的生态环境问题进行了总结,为基于水生态区的环境管理提供了技术支撑。

Preliminary Study on Aquatic Ecoregion in Three Gorges Area

Through analyzing natural elements and aquatic ecological characteristics of Three Gorges area,the dividing system of aquatic ecoregion in the area was established.Major content and criteria using in the classification were identified and characteristics indicators for different ecoregions were proposed,thus indicator system and methodology of delineation of watershed were established.Results indicated that the aquatic ecoregion of the area included two grades,and the Grade I was divided into 6 ecoregion by methods of multi-indicators overlay analysis and expert judgment with support of GIS technology.The ecological characteristics and environmental problem confronting in each region were summarized,which would provide technology support for environmental management of aquatic ecoregion.