Analysis of Mechanism and Start-up Thresholds of Seasonal Algal Blooms in a Northern Eutrophic Stratified Reservoir

• Published in: Huanjing kexue Vol. 44; no. 3; p. 1452
• Main Authors: Wen, Cheng-Cheng, Huang, Ting-Lin, Kong, Chang-Hao, Zhang, Zhi-Gang, Tian, Peng-Fei
• Format: Journal Article
• Language: Chinese
• Published: China 08.03.2023
• Subjects: China; Environmental Monitoring; Eutrophication; Fresh Water - chemistry; Phosphorus - analysis; Seasons; Sunlight; Temperature; China; environmental thresholds; algal blooms; blooming mechanism; drinking water reservoir; eutrophication; stratification
• ISSN: 0250-3301
• DOI: 10.13227/j.hjkx.202205012

Seasonal algal blooms produce a high risk for water supply safety. To explore the mechanism of seasonal algal blooms in northern eutrophic stratified reservoirs, the combination of taxonomic and functional classifications, local weighted regression (LOWESS), and Boundary line analysis (BLA) were employed to obtain the succession features and environmental thresholds of seasonal (e.g., spring and summer) algal blooms, based on the long-term and high-frequency monitoring from 2017 to 2020 in Lijiahe Reservoir. The results showed that:① the succession and response mechanisms of algal blooms were different in spring and summer. In detail, Chlorophyta, Bacillariophyta, and Dinoflagellates (e.g., low-temperature, small, high surface-to-volume genera) dominated in spring, whereas Chlorophyta, Bacillariophyta, and Cyanobacteria (e.g., high-temperature, large or colonial, low surface-to-volume genera) dominated in summer. The differences in physiological and morphological characteristics of algae were the internal cau