

FOLLOWUS
1.College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China
2.Chengdu Environmental Protection Research Institute, Chengdu 610072, China
Ming LI, E-mail: lileaf@nwsuaf.edu.cn; lileaf@163.com
Received:18 August 2020,
Accepted:18 October 2020,
Online First:14 January 2021,
Published:2022-01
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Qiang HE, Yiyao WANG, Ming LI. Influences of aeration induced turbulence on growth and competition of
Qiang HE, Yiyao WANG, Ming LI. Influences of aeration induced turbulence on growth and competition of
Aeration is an important measure to prevent cyanobacterial growth in eutrophic lakes and reservoirs. The purpose of this study is to clarify the influence of aeration induced turbulence on growth and competition of
Microcystis
and
Scenedesmus
in the presence of sediments with varying particle sizes.
Microcystis aeruginosa
and
Scenedesmus obliquus
were selected as the model organisms. Sediments with varying particle sizes were added into mono and mixed cultures of the organisms. In the absence of sediment
both low-
and high-intensity aerations (the turbulent dissipation rates were 1.60×10
-6
and 1.16×10
-5
m
2
/s
3
respectively) promoted the growth of
Scenedesmus
but the growth of
Microcystis
was inhibited particularly obvious under the high-intensity aeration conditions. In the presence of sediment
Scenedesmus
was promoted under all aeration conditions
while
Microcystis
was inhibited. The inhibition rate of
Microcystis
decreased with the increase of sediment size when treated with low-intensity aeration in the nighttime. The highest inhibition rate of
M. aeruginosa
(89.2%) was identified under the condition of low-intensity aeration in the nighttime with small sediment addition. Furthermore
our results indicated that the impacts of sediment-induced light intensity reduction on algal growth were insignificant. In the mixed culture
the growth of
Microcystis
was inhibited by
Scenedesmus
in all treatments with aeration. Our results provided a theoretical basis for the practice in controlling cyanobacteria by aeration.
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