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当前位置: 首页 > 文章 > 碱度水平对铜绿微囊藻和四尾栅藻生长和竞争的影响 农业环境科学学报 2007,26 (04) 1264-1268
Position: Home > Articles > Effects of Alkalinity on Growth and Competition of Microcystis aeruginosa and Scenedesmus quadricauda Journal of Agro-Environment Science 2007,26 (04) 1264-1268

碱度水平对铜绿微囊藻和四尾栅藻生长和竞争的影响

作  者：
杨威;孙凌;袁有才;钟远;赵乐军;刘春光;庄源益
单  位：
南开大学环境科学与工程学院;天津市市政工程设计研究院
关键词：
碱度;铜绿微囊藻;四尾栅藻;生长;竞争
摘  要：
以不含碳酸盐的BG11培养基为基础,设置4个碳酸氢盐浓度,进行铜绿微囊藻和四尾栅藻单独生长试验和竞争试验,以了解不同碳酸氢盐浓度下两种藻的单独生长和竞争生长状态。结果表明,在单独生长试验中,两种藻都能利用碳酸氢盐作为无机碳源进行光合作用并保持正常生长态势。其中铜绿微囊藻生长较适宜的碱度水平为2.4mmol·L~(-1)左右,在高碱度水平的培养基中的生长出现延迟现象,四尾栅藻总体上表现为碳酸氢盐碱度水平高的试验组中生物量高。在两种藻的竞争试验中,两者的生物量均减少。铜绿微囊藻的竞争生长能力在高碱度组中不如四尾栅藻,但在极低碱度组中强于四尾栅藻。
译  名：
Effects of Alkalinity on Growth and Competition of Microcystis aeruginosa and Scenedesmus quadricauda
作  者：
YANG Wei1, SUN Ling1, YUAN You-cai1, ZHONG Yuan1, ZHAO Le-jun2, LIU Chun-guang1, ZHUANG Yuan-yi1 (1. College of Environmental Science & Engineering, Nankai University, Tianjin 300071, China;2. Tianjin Municipal Engineering Design and Research Institute, Tianjin 300051, China)
关键词：
alkalinity; Microcystis aeruginosa; Scenedesmus quadricauda; growth; competition
摘  要：
Dense populations of phytoplankton in a lake tend to deplete inorganic carbon, with an associated rising of pH that is usually above 8. So the major form of inorganic carbon is HCO-3. Algae which can utilize bicarbonate as inorganic carbon source become dominant in eutrophic water. Microcystis aeruginosa and Scenedesmus quadricauda both have the ability to use HCO-3. To understand the effects of alkalinity on growth and competition of M. aeruginosa and S. quadricauda, the experiments were conducted on BG11 medium with different concentrations of bicarbonate. The results showed that the two algae both grew well in the separate experiments because they can directly or indirectly use bicarbonate as inorganic carbon source in photosynthesis. The optimal alkalinity for growth of M. aeruginosa was about 2.4 mmol·L-1. And a lag phenomenon occurred during the growth beginning of M. aeruginosa at high alkalinity. The density of S. quadricauda cells increased with increasing of bicarbonate levels. In competition experiments, the density of two algae cells both decreased compared to that in separate experiment. If without other restricting factors such as nutrients and temperature, the competition ability of M. aeruginosa was higher than that of S. quadricauda in the lowest alkalinity level, but less than that of S. quadricauda in the high alkalinity condition.

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