• 关键词：水体酸化  藻类  pH标准  酸雨

• 基金项目：国家“七、五”攻关项目《酸雨对不同营养级水平水生生物的影响》集体工作的一部分。

• 况琪军
• 中国科学院水生生物研究所,武汉

• 夏宜琤
• 中国科学院水生生物研究所,武汉

• 摘要：通过综合生态模拟(微宇宙)试验和藻类生物测试,研究了水体酸化对藻类的影响,结果表明,水体酸化对藻类有明显的抑制作用。48h-EC50和96h-EC50(对斜生栅藻)分别为pH4.45和4.65,当pH≥5.5时,藻类的光合作用对酸度具有很强的缓冲能力。当pH<5.0时,缓冲能力较弱。低pH对淡水生态系统的阈值处在5.0-5.5间,pH5.5可推荐为水体酸化标准。研究了两个小型酸化水体(pH4.7)中的藻类群落特征。

• Abstract：Ecological effects of water acidification on algae were investigated in microcosm(250ml) with fresh-water organisms of various trophic levels and using algal bioassay with Scenedesmus obliquus. The significant inhibitory influences of acidification on algae were observed, and the 48h-EC50 and 96h-EC 50 for Scenedesmus obliquus were 4.45 and 4. 65,respectively. Algae photosynthesis showed a strong buffer capacity to acidity at pH 5.5 and above,which was weakened remarkably when pH value dropped below 5.0. The threshold value of low pH for aquatic system ranged from 5.0 to 5.5. The algae species composition and community character in two small acidified waters (pH4.7) were investigated as well.

• Key words：acidification  fresh water  algae  pH  acid rain

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