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科技导报  2014 

辽河典型支流水生态功能三级区水生态系统健康评价

DOI: 10.3981/j.issn.1000-7857.2014.010, PP. 70-77

Keywords: 水生态功能三级区,水生态系统健康,辽河流域,清河,汎河

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Abstract:

在辽宁省辽河流域水生态功能三级区与河流水生态野外调查基础上,以辽河流域的清河、汎河两条典型一级支流为研究对象,采用主成分分析与相关性分析方法筛选水生态系统健康评价指标,构建了由总磷(TP)、总氮(TN)、化学需氧量(CODCr)、五日生化需氧量(BOD5)、溶解氧(DO)、藻类香农多样性指数(DAA)、底栖动物完整性指数(B-IBI)、鱼类完整性指数(F-IBI)、生境指数、水文指数10个指标构成的水生态系统健康综合评价指标体系,体现了河流水生态系统的物理完整性、化学完整性和生物完整性特征。研究结果表明,清河与汎河流域11个水生态功能三级区中,水生态健康等级1个(Ⅳ-5-4),亚健康等级6个(Ⅳ-5-1、Ⅳ-5-2、Ⅳ-5-3、Ⅳ-5-9、Ⅳ-5-10、Ⅳ-5-11),一般健康等级3个(Ⅳ-5-12、Ⅳ-5-13、Ⅳ-5-14),较差健康等级1个(Ⅳ-5-8)。清河与汎河流域水生态系统总体健康状态从其上游河流源头至下游入辽河干流汇入口呈现逐渐恶化的空间分布特征,且与流域人类活动强度具有密切关系。

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