关键词: 东山湾, 异养细菌, 生态分布, 环境因子, Dongshan Bay, ecological distribution, environmental factors

Abstract: Based on two cruises which dated from May 2011 to August 2011, the horizontal distribution patterns of heterotrophic bacteria in Dongshan Gulf were studied. Moreover, the relationship between the bacterial abundance and the environmental ecological factors was also analyzed. The results showed that the mean bacterial abundance in Dongshan Gulf in spring and summer were 2.05×103 mL-1 and 2.82×103mL-1 respectively. The bacteria abundance of surface water in Dongshan Gulf was higher than that of the bottom water in spring, while the bacteria abundance of surface and bottom water was well distributed in summer. Besides, the bacterial abundance in the Gracilaria lemaneiformis culture area was highest in spring in Dongshan Gulf while that in the upwelling area and fish-cage area was higer in summer. The correlation analysis showed that the bacterial abundance closely correlated with the concentration of reactive silicate, chlorophyll-a, dissolved oxygen (DO) and COD in spring and by contraries in summer. Meanwhile there was no significant correlation between the bottom of the bacteria abundance and the environmental ecological factors. Based on the standard of sea-water, it showed that Dongshan Gulf was less affected by terrestrial pollution using the number of heterotrophic bacteria as evaluating indicator.