The health of urban river is very important to the sustainable development of the city and the quality of life of the residents.With the promulgation and implementation of the Action Plan for Water Pollution Prevention and Control,the water quality of urban river in China has been significantly improved.Urban rivers in arid cities in the north are generally replenished with regenerated water,which are more susceptible to human activities.Currently,the water ecological evaluation technology system is gradually shifting from a single water quality evaluation to a comprehensive evaluation of water ecological quality,but it still needs to be further improved,especially for rivers replenished with regenerated water.It is particularly important to establish and select multi-factor,more suitable comprehensive evaluation systems and methods for such rivers.This study conducted a comprehensive evaluation of water ecological quality,including water quality,habitats,and aquatic organisms,for two rivers with different types of riverbanks in a water-scarce city in the north,and discussed the differences in the comprehensive evaluation results with different aquatic organism evaluation indices.The study found that although the water quality of the two rivers was similar during the high-water period and the normal-water period,the water quality of the hard armor protection river was slightly better,but the softbank protection river performed better in terms of habitat conditions and the evaluationindices of zoobenthos;in particular,the biological diversity was more abundant in the softbank protection river during the normal-water period.The comprehensive evaluation results showed that the water ecological quality of the softbank protection river was overall better than that of the hard armor protection river.In terms of the selection of aquatic organism evaluation indices,the biotic index(BI),the biological pollution index(BPI),and the Shannon-Wiener diversity index(H)could all reasonably reflect the comprehensive water ecological quality of the study area's urban rivers.The study suggests that more softbank protection rivers should be adopted in river embankment and design to improve habitats and biodiversity and achieve the integration of beautiful rivers and natural environments in cities.
关键词
城市河道/底栖动物评价指数/水生态质量综合指数
Key words
surban river/evaluation indices of zoobenthos/comprehensive evaluation of water ecological quality
维普
万方数据