连续水流和间歇水流对微囊藻生长的影响

为了解不同的水体流动方式对铜绿微囊藻生长的影响。实验在控制温度和光照条件下,室内采用野外原水培养基模拟连续水流和间歇水流微囊藻的生长。实验结果表明,间歇水流下微囊藻在各流速下的生长差异较小,连续扰动下微囊藻在各流速下的生长差异较大,在流速为35 cm/s时达到最大值;间歇性扰动条件下微囊藻密度较连续性水流条件下高。这可能是在间歇扰动下水流主要影响藻细胞对营养盐的吸收,连续扰动的低流速下主要是通过对营养盐的吸收对微囊藻产生影响,在高流速下是水流对藻细胞的机械破坏为主;同时培养基中藻细胞形成群体产生微环境有利于微囊藻的生长。水体流动的方式不同,水流对微囊藻细胞生长的作用将发生改变,这为扰动控制蓝藻生长提供科学依据。

Effect of Water Flow Regimes on Growth of Microcystis aeruginosa

Interferences of water flow on growth of Microcystis aeruginosa were studied with difference flow regimes such as continuous and intermittent flows of different velocities.The laboratory experiment conducted indicated that,compared with intermittent flow,interference of continuous flow on the algae growing was significantly detectable,and the stress reached maximum at the flow rate of 35 cm/s.On the other hand,algae growing density when affected by intermittent flow was higher than that by continuous flow,which implied that intermittent flow mainly affected the nutrient absorbing ability of algae cells.The experimental study also suggested that the continuously turbulent flow at high velocities could exert mechanical forces onto the algae damaging algal cells;and that the colony formed by Microcystis aeruginosa cells,however,produced a kind of micro-environment which was conducive to the growth of Microcystis aeruginosa.