pH对几种淡水藻类生长的影响

Effect of pH on Growth of Several Freshwater Algae

利用藻类批量培养试验研究了不同初始pH和不同固定pH对三种淡水蓝藻和三种淡水绿藻生长的影响。结果表明:藻类对水体pH有较强的缓冲能力,可以通过自身增殖活动改变水体的pH,因而不同初始pH对藻类生长的影响不明显,但加了pH缓冲剂固定初始pH后,藻类的生长反应很明显,适宜的pH范围各不相同,铜绿微囊藻(Microcystis aeruginosa)、水华鱼腥藻(Anabaena flos-aquae)、浮游颤藻(Oscillatoria planctonica)适宜的pH分别9.0、8.0～9.0和7.0～8.0,斜生栅藻(Scendesmus obliquus)、绿球藻(Chlorococcum sp).、雷氏衣藻(Chlamydomonas reinhardtii)适宜的pH分别为9.0～10.0、7.0～8.0和7.0。蓝藻适宜的pH并不都比绿藻的高。

Growth of algae at different initial and constant pH values was studied with bulk culture. Initial pH value in BGll culture medium was adjusted to 6.0, 7.0, 8.0, 9.0 and 10.0 with either 0.5mol/L NaOH or 0.5mol/L HCL. Constant pH values were kept by addition of 20mmol/L bicine. Results showed that different initial pH values had slight effects on growth of algae, because pH values changed to about 10.0 after 4 days of cultivation, but different constant pH had marked effect on growth of algae. Optimal pH values for Microcystis aeruginosa, Anabaena flos-aquae and Oscillatoria planctonica were 9.0, 8.0-9.0 and 7.0-8.0 respectively while for Scendesmus obliquus, Chlorococcum sp and Chlamydomonas reinhardtii were 9.0- 10.0, 7.0-8.0 and 7.0 respectively.