Influences of aeration induced turbulence on growth and competition of Microcystis and Scenedesmus in the presence of sediments with varying particle sizes
Influences of aeration induced turbulence on growth and competition of Microcystis and Scenedesmus in the presence of sediments with varying particle sizes
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DOI：
10.1007/s00343-021-0317-5
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发表时间：
2021-08
影响因子：
1.6
通讯作者：
Qiang He;Yiyao Wang;Ming Li
中科院分区：
文献类型：
--
作者：
Qiang He;Yiyao Wang;Ming Li
曝气是富营养化湖泊水库中防止蓝藻生长的重要措施。以铜绿微囊藻（Microcystis aerosaicosa）和栅列藻（Scenedesmus dellus）为模式生物，研究了不同粒径沉积物中曝气诱导的湍流对微囊藻和栅列藻生长和竞争的影响。将具有不同粒径的沉积物加入到生物体的单一和混合培养物中。在无泥沙条件下，低强度和高强度曝气（紊动耗散率分别为1.60×10− 6和1.16×10− 5 m2/s3）均能促进栅藻的生长，但在高强度曝气条件下对微囊藻的生长抑制尤为明显.沉积物对栅藻生长有促进作用，对微囊藻生长有抑制作用。夜间低强度曝气对微囊藻的抑制率随底泥粒径的增大而降低。M.铜绿假单胞菌（89.2%）在夜间低强度曝气和少量底泥投加条件下检出。此外，我们的研究结果表明，沉积物引起的光照强度降低对藻类生长的影响是微不足道的。在混合培养条件下，栅藻素对微囊藻的生长均有抑制作用。研究结果为曝气控制蓝藻的实践提供了理论依据。
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 ofMicrocystisandScenedesmusin the presence of sediments with varying particle sizes.Microcystis aeruginosaandScenedesmus obliquuswere 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 1.60×10−6and 1.16×10−5m2/s3, respectively) promoted the growth ofScenedesmus, but the growth ofMicrocystiswas inhibited particularly obvious under the high-intensity aeration conditions. In the presence of sediment,Scenedesmuswas promoted under all aeration conditions, whileMicrocystiswas inhibited. The inhibition rate ofMicrocystisdecreased with the increase of sediment size when treated with low-intensity aeration in the nighttime. The highest inhibition rate ofM. 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 ofMicrocystiswas inhibited byScenedesmusin all treatments with aeration. Our results provided a theoretical basis for the practice in controlling cyanobacteria by aeration.