摘要
为探讨UV B辐射对海洋生态系统的影响 ,研究了短期 (2d)UV B辐射对金藻 870 1、小新月菱形藻和亚心形扁藻 3种藻单养的敏感性比较以及长期 (2 1d)UV B辐射对 3种藻混养的种间竞争性平衡的影响。实验表明 ,(1)UV B条件下 ,单养和混养情况下 ,最敏感的藻是金藻 870 1,小新月菱形藻次之 ,亚心形扁藻最不敏感 ;(2 )增强的UV B为对UV B具有高耐受力的亚心形扁藻提供了竞争优势 ,使种间竞争平衡向着有利于亚心形扁藻的方向发展 ,到第 2 1天 ,UV B辐射 (2 .88J/m2 ,5 .76J/m2 )的处理组中 ,亚心形扁藻成为优势种。
The sensitivity of short-term (2d) UV-B radiation on solitary cultivated three species of marine microalgae and the effects of long-term (21d) UV-B radiation on competitive balance of mixed cultivated three species of marine microalgae are examined in this experiment. Under the condition of solitary cultivation, in short-term(2d) UV-B radiation, the most sensitive algae of the three species of microalgae is Isochrysis galbama park 8701, the less is Nitzschia clostertium, the lastest is Platymonas subcordiformis. Under the condition of mixed cultivation, the total biomass of three species of microalgae under the UV-B dosage of 2.88J/m2, 5.76J/m2 is greatly reduced, and the community structure changes also. The experiment shows that the sensitivity of UV-B radiation on three species of microalgae is Isochrysis galbama park 8701>Nitzschia clostertium>Platymonas subcordiformis. Algal interspecific competition changes greatly during the experiment. When UV-B radiation dosage is at a level of 0J/m2, the dominant algae changes from Isochrysis galbama park 8701 to Nitzschia clostertium. When UV-B radiation is at a level of 2.88J/m2, the dominant algae changes from Isochrysis galbama park 8701 to Nitzschia clostertium, then changes from Nitzschia clostertium to Platymonas subcordiformis. When UV-B radiation dosage is at a level of 5.76J/m2, the dominant algae changes from Isochrysis galbama park 8701 to Platymonas subcordiformis. So enhanced UV-B radiation provide competitive dominance for Platymonas subcordiformis, which has high tolerance to UV-B, and in general, the effect of UV-B is in favor of Platymonas subcordiformis. On the 21 st day, in the treated groups of UV-B radiation(2.88J/m2,5.76J/m2), Platymonas subcordiformis becomes the dominant algae.
出处
《中国海洋大学学报（自然科学版）》
CAS
CSCD
北大核心
2005年第1期108-112,共5页
Periodical of Ocean University of China
基金
国家自然科学基金项目 (30 2 70 2 58)
山东省优秀中青年奖励基金项目 (0 3BS1 2 0 )资助
关键词
UV-B增强
海洋微藻
种间竞争
UV-B radiation
marine microalgae
interspecific competition
