|关键词: 酸雨 酸性pH 水生态系统 水生生物群落
|Effects of acid rain on organisms in aquatic ecosystem
Institute of Hydrobiology, Academia Sinica, Wuhan 430072
|The water bodies acidification of different type of water bodies caused by acid rain and the buffer capacity are introduced and the effects of acid rain on some organisms at various trophic levels in aquatic ecosystem are reviewed. The sensitivity differences to low pH among some aquatic organisms and different developmental stages are summarized. Also, the tolerance variation of organisms to low pH owing to heredity and adaptability is described. The key characteristics of aquatic communities in acidified water are decreased species number9reduced diversity, lessened biomass and destroyed food chain. The toxic effect of low pH on aquatic life include inhibition of gas exchange, disorder of body salt adjustment, imbalance of acidity and alkalinity, and the combined effects with metals. Several problems are briefly discussed and some sugestions are put forward.
|Key words: Acid rain acidic pH aquatic ecosystem aquatic community