Two-year moving aeration controls cyanobacterial blooms in an extremely eutrophic shallow pond: Variation in phytoplankton community and Microcystis colony size
Two-year moving aeration controls cyanobacterial blooms in an extremely eutrophic shallow pond: Variation in phytoplankton community and Microcystis colony size
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两年移动曝气控制极度富营养化浅水池塘中的蓝藻水华：浮游植物群落和微囊藻菌落大小的变化
DOI：
10.1016/j.jwpe.2021.102192
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发表时间：
2021
影响因子：
7
通讯作者：
Ming Li
中科院分区：
文献类型：
--
作者：
Yiyao Wang;Qiang He;Hong Tong;Yongwang Han;Ming Li
人工混合被认为是控制蓝藻繁殖最有效的方法之一。然而，这种方法的成功率仍然很低，能否成功应用于浅水尚不清楚。本研究在一个水深为1.5 m的极富营养化浅池中采用自行设计的移动曝气装置。设置一个类似的不曝气池塘作为对照。实验为期两年（2019-2020年）。除氨浓度外，两池水质参数均值均无显著差异。尽管如此，第二年处理池中蓝藻华的发生已经消除，而对照池中蓝藻华仍然频繁发生。在实验的第二年，蓝藻是控制池中主要的浮游植物门，占总群落的68%。然而，在处理池中，蓝藻门的最大比例仅为30%，硅藻门和绿藻门的比例约为80%。微囊藻属在对照池中为优势种，处理池第二年为优势种。第二年处理池微囊藻菌落大小显著下降。结果表明，移动曝气是一种控制浅水池塘和湖泊蓝藻繁殖的环保方法。曝气可使微囊藻菌落分解，使浮游植物群落由蓝藻门向绿藻门和硅藻门转变。
Artificial mixing is considered as one of the most effective methods for controlling cyanobacterial blooms. However, the success rate of this method is still very low, and whether it could be successfully applied to shallow waters remains unclear. In the current study, a self-designed moving aeration device was employed in an extremely eutrophic shallow pond with water depth of 1.5 m. A similar pond without aeration was set as the control. The experiment was performed over two years (2019–2020). There were no significant differences in the mean values of all water quality parameters (except for ammonia concentration) between the two ponds. Nevertheless, the occurrence of blooms was eliminated in the treated pond in the second year, while cyanobacterial blooms still occurred frequently in the control pond. In the second year of the experiment, Cyanobacteria was the dominant phytoplankton phylum in the control pond, comprising up to 68% of the total community. However, in the treated pond, the maximum proportion of Cyanobacteria was just 30%, while the proportions of Bacillariophyta and Chlorophyta reached approximately 80%.Microcystiswas the dominant genus in the control pond, whileScenedesmusandPediastrumbecame dominant in the treated pond in the second year.Microcystiscolony size decreased substantially in the treated pond in the second year. The results suggest that moving aeration is an environmentally friendly method of controlling cyanobacterial blooms in shallow ponds and lakes. The aeration could disaggregateMicrocystiscolonies and shift the phytoplankton community from Cyanobacteria to Chlorophyta and Bacillariophyta.