水体扰动对铜绿微囊藻生长影响的规律及原因

在实验室条件下模拟不同扰动状态的水体,探讨铜绿微囊藻的生长与水体扰动之间的关系.结果表明,水体的扰动对铜绿微囊藻的生长同时存在促进和抑制作用.低速度扰动时,促进作用占主导地位;高速度扰动时,抑制作用占主导地位.实验发现中营养化条件下,当温度为25℃,光照为4000 lx,光暗比为12 h∶12 h时,300 r.min-1的扰动速度是铜绿微囊藻生长的临界速度.扰动过程可以为铜绿微囊藻的光合作用提供充足的二氧化碳是其能够促进铜绿微囊藻生长的潜在原因.

Growth of Microcystis aeruginosa under different disturbance

The growth rate of Microcystis aeruginosa at different hydrodynamic condition was studied.The results showed the flow disturbance had either inhibitory or stimulating effect on the growth of Microcystis aeruginosa depending on the flow speed.When the speed of flow disturbance was low,growth was enhanced.At high speed,the inhibitory action played the leading role.It was observed that 300 r · min-1 was the critical speed at 25 ℃,light intensity 4000 lx,light/dark 12 h ∶ 12 h in middle nutrient water.One of the possible reasons for the enhancement of the growth of Microcystis aeruginosa is that the flow disturbance provides sufficient carbon dioxide for the photosynthesis of Microcystis aeruginosa.