Driving factors of algal blooms in drinking-water reservoirs in Lake Taihu Basin

被引：4
|
作者：
Lv X. [1 ,2 ]
Zhu M. [2 ]
Ma Y. [1 ]
Zou W. [2 ]
Xu T. [3 ]
Zhang Z. [1 ]
Zhu G. [2 ]
机构：
[1] School of Municipal and Environmental Engineering, ShandongJianz.hu University, Jinan
[2] State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing
[3] College of Environmental and Resource Sciences, Zhejiang University, Hangzhou
来源：
Hupo Kexue/Journal of Lake Sciences | 2023年 / 35卷 / 05期
关键词：
cyanobacterial bloom; diatom bloom; Drinking water source reservoir; extreme weather; hydrological process; mesotrophic; phosphorus;
D O I：
10.18307/2023.0511
中图分类号：
学科分类号：
摘要：
Algal bloom, caused by abnormal proliferation of algae, is one of the major eeological disasters threatening the safety of many drinking water resource reservoirs in China. Investigating the driving factors of algal proliferation in drinking water resource reservoirs is a prerequisite for preventing and controlling algal blooms and water quality problems. To investigate the driving factors of algal blooms in reservoirs, the cell density and biomass of phyloplanklon and related environmental factors were analysed during 12 months from Fushi Reservoir and Laoshikan Reservoir in the Taihu Basin. The results showed that reservoirs in the subtropical monsoon region were at risk of proliferation of cyanobacteria and diatoms. A severe diatom bloom dominated by Achnanthes occurred in Laoshikan Reservoir in May, and the corresponding cell density of diatom reached 6232x104 cells/L. Cyanobacterial blooms occurred in June and September in Fushi Reservoir. The result of redundancy analysis indicated that total phosphorus, water temperature and water level were key factors influencing the variation of phytoplankton community structure in reservoirs. A total phosphorus concentration higher than 0.024 mg/L could promote algal proliferation. The risk of cyanobacteria and diatom blooms increase significantly when the water temperature was higher than 20^ and 16X1 respectively, while the best water temperature for cya-nobacteria and diatom blooms was 30T] and 22T] respectively. Low or drastic fluctuations in water level could be beneficial for algal blooms. Our results indicate that the abnormal proliferation of phytoplankton in mesotrophic drinking water reservoirs is influenced by nutrient, hydrological and meteorological factors. External nutrient loading should be reduced to prevent and control algal blooms in such mesotrophic reservoirs, and extreme weather events, hydrological processes and food chain regulation should also be considered. © 2023 Science Press. All rights reserved.
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页码：1516 / 1528
页数：12
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