流动条件下四尾栅藻对铜绿微囊藻生长的影响

为揭示在水流条件下四尾栅藻与微囊藻竞争时对微囊藻生长的影响。在室内无菌条件下,通过有机玻璃环形槽模拟不同水体流速下四尾栅藻对铜绿微囊藻生长的影响。通过竞争抑制参数对相互间的竞争关系、微囊藻生物量和最大比增长速率进行了分析。结果表明,在流动水体中四尾栅与微囊藻之间的相互竞争表明,微囊藻对水流的适应性降低,在单独培养条件下最适宜的流速为35cm/s,混合培养条件下则为5cm/s,而对四尾栅藻的影响较小;混合培养下微囊藻的对数生长时间较单独培养下延长;在流速为0～25cm/s时四尾栅藻促进微囊藻的生长、比增长速率增加,当流速为35cm/s时则表现为抑制作用、比增长速率降低;对照组和实验组中微囊藻对四尾栅藻生长产生弱的抑制作用。

Effects of Scenedesmus quadricauda on the growth of Microcystis aeruginosa under fluid motion

In order to reveal the effects of competition of other algae and Microcystis on growth of Microcystis under flow condition before the formation of algal blooms, and the growth of Microcystis aeruginosa is affected by Scenedesmus quadricauda under flow conditions, experiments are conducted by plexiglass ring groove in axenic laboratory. The competition relationship affected by competition parameters, density and specific growth rate of Microcystis are analyzed. The results show that the Microcystis aeruginosa adaptability on flow water is reduced under the competition between Scenedesmus quadricauda and Microcystis aeruginosa, namely, the optimal flow rate in simple and mix culture are 35 cm/s and 5 cm/s respectively. The exponential growth time of Microcystis aeruginosa under mix culture are longer than under simple culture. Microcystis aeruginosa growth are stimulated and its specific growth rate increase by Scenedesmus quadricauda at flow rate from 0 to 25 cm/s, contrary to these results at 35 cm/s. The growth of Scenedesmus quadricauda is slightly inhibited by Microcystis aeruginosa in control group and treatment groups during the experiment.