硝化细菌对铜绿微囊藻生长的影响

Effects of nitrifying bacteria on the growth of Microcystis aeruginosa

细菌和藻类共同参与水生态系统中的营养再生和物质循环,研究菌藻之间的关系对调控水生态系统具有重要的意义。本研究通过菌藻共同培养,研究硝化细菌在不同环境条件下对铜绿微囊藻(Microcystis aeruginosa)生长的影响。结果表明,108cells/mL和109cells/mL的硝化细菌对铜绿微囊藻有微弱的抑制作用,10 d后处理组与同期对照相比分别下降了12.5%和15.0%;107 cells/mL的硝化细菌对铜绿微囊藻的生长没有抑制作用。不同环境条件下(温度、光照、pH值、盐度和DO)硝化细菌对铜绿微囊藻的抑制作用存在差异:较高温度下,抑制作用较小;低强度光照能使抑制作用增强,500 lx条件下菌藻共培养10 d后处理组与同期对照相比下降了17.2%;偏碱性条件下,抑制作用较小;高盐度下没有体现出一定的抑制作用;较高DO下,抑制作用较小。

Bacteria and algae participate in the nutrient recycling and material circulation in aquatic ecosystems.Studying the relationship between bacteria and algae is meaningful to control the aquatic ecosystems.The effects of nitrifying bacteria on the growth of Microcystis aeruginosa were studied when they were cultured jointly under different environmental conditions.The results indicated that nitrifying bacteria of 108 cells/mL and 109 cells/mL had low inhibition on the growth of Microcystis aeruginosa.The inhibiting rates of the treatment groups（108 cells/mL,109 cells/mL） compared with the same period control decreased by 12.5% and 15.0% after 10 days.The nitrifying bacteria of 107 cells/mL had no inhibition.Some factors（culturing temperature,light,pH of culture medium,salinity and dissolved oxygen） could all impact the controlling effects in different degree： the inhibition was low under high temperature;low-intensity light enhanced the inhibition.the inhibition rate decreased by 17.2% compared with the same period control after 10 days under 500 lx;the inhibition was low under alkaline condition;there was no inhibition under high salinity;the inhibition was low under high dissolved oxygen.