密云水库水体营养化水平及水生态研究OA

In order to comprehensively understand the aquatic ecological condition of the Miyun Reservoir,this paper systematically analyzes the eutrophication level,phytoplankton,macrophytes,zooplankton,and benthic organisms based on the monitoring data from 2021 to 2023 in the reservoir area.The results show that,as of 2023,both the reservoir area and the incoming water bodies are at a moderate level of eutrophication.A total of 7 phyla and 79 genera of phytoplankton were identified in the reservoir,with dominant species in the year being Asterionella formosa,Synura petersenii,and Anabaena flos-aquae.A total of 54 species of macrophytes were found,with an increase in species diversity(18 additional species)and improved coverage.The disappearance or extinction phenomenon is gradually recovering.The total density of zooplankton increased,but species diversity decreased,with dominant species mainly belonging to the Phylum Rotifera,and the species density showed significant seasonal variation.Benthic organisms are primarily pollution-tolerant species,with higher numbers and species in relatively shallow areas compared to deep areas.However,the species composition is simple,and mollusks are rare.The study results provide theoretical support and data for the eutrophication control and aquatic ecological protection of the Miyun Reservoir.