曝气对遮光条件下藻类消亡的影响

The effect on algae decay by aeration under light-shading condition

以斜生栅藻和铜绿微囊藻为材料,分析低光照度范围内藻类光合作用特性和呼吸速率,研究曝气对遮光条件下藻类消亡过程的影响。结果表明,(25±1)℃时斜生栅藻和铜绿微囊藻的光补偿点分别为600、720lx,呼吸速率分别为89、57μmol/(mg.h);光照度低于光补偿点,藻类内源呼吸导致水体DO浓度降低;单纯遮光(光照度为0lx)处理7d,斜生栅藻和铜绿微囊藻生物量去除率(以OD650计)分别为17.2%和39.1%;增加曝气措施后,斜生栅藻和铜绿微囊藻去除率分别上升到71.3%和92.0%,曝气能有效促进藻类消亡。实验数据拟合结果证明,藻细胞消亡符合藻细胞内源呼吸—衰减模型。

Utilizing Scenedesmus obliquus and Microcystis aeruginosa as represent algaes, the investigation by photosynthesis and respiration rate in low illumination and the effect of aeration on algae decay processes under lightshading condition were studied. The results showed that at （25± 1） ℃ the light compensation point for Scendesmus obliquus and Microcyscis aeruginosa were 600 lx and 720 lx respectively, and respiratory rate were 89 μmolO2/（mg·Chl-a·h） and 57 molO2/（mg·Chl-a·h）. When illumination was below the light compensation point, endogenous respiration of algae led to DO depletion. 7 d after light shading, remove efficiency （measured as OD650 ） of Scendesmus obliquus and Microcyscis aeruginosa were 17.2% and 39. 1%, wearers; adding aeration, the remove efficiency increased to 71.3% and 92.0% respectively. Therefore, it was confirmed that aeration could significantly promote algae decay rate. The experimental data results showed that algae decay process agreed well with the endogenous respiration-decay model. This study provides basic information for improving algae control efficiency by the light-shading method.