Infl uences of aeration induced turbulence on growth and competition of Microcystis and Scenedesmus in the presence of sediments with varying particle sizes  

作　　者：Qiang HE Yiyao WANG Ming LI 

机构地区：[1]College of Natural Resources and Environment,Northwest A&F University,Yangling 712100,China [2]Chengdu Environmental Protection Research Institute,Chengdu 610072,China

出　　处：《Journal of Oceanology and Limnology》2022年第1期142-152,共11页海洋湖沼学报（英文）

基　　金：Supported by the National Natural Science Foundation of China(No.51979236);the Sichuan Science and Technology Program(No.2019YFH0127);the Water Conservancy Science and Technology project of Shaanxi Province(No.2019slkj-1).Ming LI was funded as a Tang Scholar by the Cyrus Tang Foundation and Northwest A&F University。

摘　　要：Aeration is an important measure to prevent cyanobacterial growth in eutrophic lakes and reservoirs.The purpose of this study is to clarify the infl uence 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 identifi ed 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 insignifi cant.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.

关 键 词：aeration induced turbulence suspended sediment phytoplankton community CYANOBACTERIA SCENEDESMUS 

分 类 号：Q945[生物学—植物学]