富营养化水体中的溶源性浮游细菌分布与环境因子的关系

Study on the relationship of environmental factors and the lysogenic bacterioplankton distribution in eutrophication lakes

2006年5月—2007年1月期间,在夏冬两季分别对湖北省不同营养程度的淡水富营养化水体进行了采样,通过丝裂霉素C诱导后,对其进行溶源性浮游细菌的检测和环境因子的相关性分析.结果显示:在富营养化水体中,全年夏冬两季的可诱导率并无显著差异,但重富营养水体中的可诱导率(74%～78%),显著高于轻度富营养水体(21%～66%).可诱导率分别与TLI营养指数和COD极显著正相关(p<0.01).可诱导率与浮游生物总量并无相关性,水体总营养水平是决定富营养化水体中可诱导率的关键因素之一,季节变化(水温)也不是决定可诱导率的关键.

A series of samples was collected from different nutritional level of eutrophic fresh lakes in Hubei province during May 2006 to January 2007. This samples were treated with mitomycin C to stimulated prophage induction, the bacterioplankton abundance and environmental factors were measured also. It was observed that the frequency of lysogenic cells （FLC） was no significant differences between summer and winter of the year in the eutrophic lakes. But the FLC in hyper eutrophic lakes （74 %-78%） was significantly higher than that of light eutrophic lakes （ 21 %-66 %）. Across all investigated lakes, FLC was significant positive related to TLI and COD （p〈0.01）. It appeared that there was no correlation between FLC and total plankton abundance, the same result was observed between FLC and temperature. It was the nutrient level of eutrophication that were the decisive factor in FLC.