基于大型底栖动物的长株潭都市圈典型河流生态健康评价OA

The Chang-Zhu-Tan metropolitan area serves as the core growth pole of Hunan Province.It is of great significance to carry out water ecological health research for promoting the construction of ecological green metropolitan area and strengthening the regional ecological security system.To understand the status of water ecological environment in the area,a systematic monitoring of macrozoobenthos and water environ-ment factors was carried out in December 2020 to January 2021,and the benthic index of biotic integrity(B-IBI)evaluation system was constructed to evaluate the ecological health status of the rivers.The results showed that a total of 61 taxa(species/genus)of macrozoobenthos belonging to 8 classes and 4 phyla were i-dentified in the area,and the dominant groups were Insecta and Gastropoda.The ecological health status of the regional rivers was in a moderate condition,with the Lianshui River being better than the Lushui River,and the Liuyang River being the worst.Water temperature,phosphate,dissolved oxygen and total nitrogen were the main environmental factors affecting the dominant communities of macrozoobenthos.These results can provide a reference for river ecological restoration and water environment management in the Chang-Zhu-Tan metropolitan area.