Abstract
The effects of low and high turbulence on the polysaccharides content and colony formation of Microcystis under different nutrition conditions were studied through a laboratory experiment. The rotation speed of 60rpm and 200rpm was provided to represent the turbulence induced by the wind with a speed of 4.0m/s and 6.5m/s in a shallow lake. Transitory and intermittent high turbulence could stimulate the growth of Microcystis and increase of pH value, but the increase of the pH value was not along with the increase of IC. Under eutrophication, N-limited and P-limited conditions, the salvation ratio increased noticeably (increased from 30% to 60%) because of the increase in rotation speed. High turbulence also makes the colony size be smaller than that with low turbulence. Our results suggested that high turbulence could stimulate the salvation of bound extracellular polysaccharides (bEPS) which was adverse to colony formation of Microcystis.
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