流域一、二级水生态分区技术及在辽河流域的应用

Zoning of aquatic ecoregions at levels Ⅰ and Ⅱ: Case study in Liaohe Basin

基于驱动力-压力-状态-影响-响应指标分析框架,提出水生态一、二级分区所适用的指标类别,在环境要素与水生态系统因子相关性分析和环境要素空间变异尺度分析基础上,建立了流域水生态一、二级分区指标体系。采用"自上而下"和"自下而上"相结合的分区方法,在辽河流域进行了水生态一、二级分区应用研究,将辽河流域划分为4个水生态一级分区和8个二级分区,并对各个水生态分区的特征进行了总结。辽河流域分区应用表明,水生态分区过程中仍然存在较大的主观因素,尤其是水生态二级分区边界的确定。

Indicators for aquatic ecoregions at levels I and a level II are defined according to the driving force-pressure-state-impact-response ( DPSIR ) framework, and an indicator system is established on the basis of assessment of the relationship between environmental and aquatic ecological components, and the spatial heterogeneity of the environmental components. A combined zoning method moving from top to bottom and from bottom to top is used for zoning of aquatic ecoregions at levels I and II in the Liaohe Basin. The Liaohe Basin is divided into four aquatic ecoregions at level I and eight aquatic ecoregions at levelII. The features of each ecoregions are described. It is pointed out that subjective factors still exist in the zoning process of aquatic ecoregions in the Liaohe Basin, especially in determining the boundary of ecoregions at level II.