摘要
分析太湖鲜底泥和干底泥中活体藻类的种类和数量,以及几种太湖水华优势藻类经过低温、低光处理后的变化,探讨了太湖水华中的优势藻类对湖泊不良环境的适应.研究结果表明,在鲜底泥中检测到11种活体藻类.经低温(5～6 ℃)处理的底泥中检测到8种活体藻类,总细胞密度为2100个·mL-1,比常温(10～28 ℃)下保存的底泥中的活体藻类种类(4种)更多,总细胞密度(1090个·mL-1)更高.长期干旱处理也不能使底泥中的藻类完全失去生命力;经过低温、无光处理7个月的微囊藻(Microcystis aeruginosa)和斜生栅列藻(Scenedesmus obliquus)依然保持良好的生长能力,只是微囊藻的对数生长期比对照出现的晚一些.它们在湖泊中广泛存在,在水华中的爆发的特性是与它们对不良环境的适应性和抗性密切相关的.
The sediments of Taihu Lake, collected in winter, were studied and 8 species of living alga were got in the cultures. More kinds of alga (8 species, with a total density of 2100 cell·mL-1), most of which were common species in Taihu bloom, were got in the sediment in low temperature (5~6 ℃) treatment than that (4 species, 1090 cell·mL-1) of normal temperature (10~28 ℃), which indi- cate that some algal colonies had faster degradation rate and were more easily affected by bacterial in normal temperature. The result that some kinds of dominating alga in Taihu Lake were developed in dry sediment culture showed that these kinds of alga had ad- vantage to adapt to the dry environment. After being treated with low temperature (5~6 ℃, according to the mean temperature of Taihu Lake in winter) and darkness for 7 months, Microcystis aeroginosa and Scenedesmus obliquus can grow and generate in artifi- cial medium. In conclusion, there were close relationship between the algal domination in bloom and their resistance to unsuitable environment.
出处
《生态环境》
CSCD
2004年第4期500-502,共3页
Ecology and Environmnet
基金
中国科学院知识创新工程项目(KZCX-SW-12)
国家"973"项目(2002cb412305)
关键词
太湖
藻类
抗逆性
Taihu Lake
algae
adaptation
