东湖围隔与主体湖区浮游植物群落结构的比较研究

A Comparative Study of Phytoplankton Community Structure in the Enclosure and Main Body of East Lake

为研究东湖围隔和主体湖区浮游植物群落结构和理化因子的变化,并评价围隔对水质的改善作用,于2012年3月-2013年2月对湖区各样点进行了浮游植物的采集及理化因子的测定.结果表明：以浮游植物密度和叶绿素a（Chl-a）含量为参数评价,围隔水质明显优于主体湖区,围隔藻类种数总和及物种多样性指数均高于主体湖区;围隔绝大部分水体营养因子数值均明显低于主体湖区（除DO,pH）.浮游植物群落结构特征季节变化明显,表现在夏季浮游植物密度和Chl-a含量均最高,冬季最低;多样性指数依秋、夏、春、冬递减.

To study the variation of phytoplankton community structure and environmental parameters in the enclosure and main body of East Lake, and evaluate the ameliorative effect of enclosure on the water quality in East Lake, phytoplankton from various sampling points in the lake were collected from March 2012 to February 2013 , and the physicochemical factors were determined. The results showed that the water quality of enclosure was significantly better than that of the main body of the lake in terms of phytoplankton density and the content of chlorophyll a （ Chl-a） . The number of algae species and the biodiversity indices of the enclosure were also higher than that of the main lake. Most nutrient factors in the enclosure were lower than that of main lake （ except DO,pH）. The seasonal variation of phytoplankton community structure and environmental parameters were obvious the phytoplankton density and content of Chl-a were maximal in summer and minimal in winter, while the biodiversity indices decreased in the order of autumn, summer, spring and winter.