岷江成都段水生态健康评价研究

为探索城市河流健康评价的有效方法，以岷江（成都段）部分河流为研究对象，通过调查水质、生境、浮游藻类、底栖动物，以底栖动物总分类单元数、毛翅目分类单元数、蜉蝣目分类单元数、EPT百分比、优势分类单元百分比、双翅目百分比6个指标构建底栖动物完整性指数（B-IBI），并与水生态环境质量综合指数（WQI）进行对比，以验证B-IBI的可行性.结果表明:①B-IBI评价23个河流样点中，5个健康，1个亚健康，5个一般，2个差，10个很差；②相同区域的B-IBI和WQI结果比较发现，二者具有较好的相关性，B-IBI更能全面地反映河流生物学质量；③基于B-IBI评价的若干不同城市河流健康状况，均在远离城市的上游区域相对较好，人口集中区域相对较差.研究显示，B-IBI用于岷江成都段河流健康评价是可行的. 

Health Assessment of Min River in Chengdu Section

The aim for this research is to select suitable methods to assess the health of the river ecosystem of rivers flowing through urban areas. Based on the water quality, river habitat, phytoplankton and benthic invertebrate data collected from the Chengdu section of the Min River, the number of total taxa, Trichoptera taxa, and Ephemeroptera taxa, and the percentage of EPT taxa, dominant species, and Diptera taxa were used to formulate a benthic index of biotic integrity (B-IBI) system. The B-IBI was used to assess the health state of the Min River in Chengdu section, and the results were compared with that using water eco-environment quality index (WQI). The results showed 5 healthy state sites, including one sub-healthy state site, five fair state sites, two poor state sites, and 10 extremely poor state sites. The comparison of results based on the two methods indicated that the results of both methods were comparable for the same sites. B-IBI can fully describe biological integrity. The health assessment results of different cities revealed a healthier river ecosystem in the upstream than in populated and developed downstream areas. The study showed that the B-IBI is suitable for the health assessment of the Min River in Chengdu.