淀山湖浮游植物叶绿素a粒径组成及其与水质因子相关性

于2005年6月至2006年5月对淀山湖小型（20～200 μm）、微型（2～20 μm）和微微型（<2 μm）浮游植物叶绿素a和水质因子进行逐月调查研究。结果表明：小型和微型浮游植物是淀山湖水体年均叶绿素a的主要贡献者，二者贡献率之和为7479%。淀山湖叶绿素a粒径组成百分比的季节变动与水体浮游植物群落结构季节演替密切相关：小型浮游植物叶绿素a浓度所占百分比春季最高，而微型、微微型的则分别在秋、冬季最高。相关性分析显示，小型、微型浮游植物叶绿素a浓度百分比与NH3 N含量分别呈显著正、负相关，微微型浮游植物叶绿素a百分比与BOD5呈极显著负相关。对应滤食性鱼类等水生动物的食性粒级，探讨了运用非经典生物操纵技术防治淀山湖富营养化的可行性。〖

SIZE FRACTIONATED CHLOROPHYLL A OF PHYTOPLANKTON AND THE CORRELATION WITH WATER QUALITY VARIABLES IN DIANSHAN LAKE,CHINA〖

Size fractionated chlorophyll a of phytoplankton and water quality variables were investigated monthly from June 2005 to May 2006 in Dianshan Lake.Results showed that the chlorophyll a concentration of micro phytoplankton (20～200 um) and nano phytoplankton (2～20 um) were main contributors to the annual mean of chlorophyll a in Dianshan Lake,both accounting for 7479%.Seasonal variations of percentages of all size fractionated chlorophyll a were closely related with seasonal succession of phytoplankton community structure.Percentage of micro phytoplankton chlorophyll a peaked in spring,while that of nano ,pico phytoplankton peaked in autumn and winter,respectively.Bivariate correlation analysis showed that percentage of micro phytoplankton chlorophyll a was correlated positively with NH3 N,while that of nano phytoplankton〖JP〗 was correlated negatively with NH3 N.〖JP2〗Percentage of pico phytoplankton chlorophyll a was correlated negatively with BOD5,significantly.Correspondingly,the feasibility of non classic biomanipulation in controlling algal bloom in Dianshan Lake on the basis of feeding habits of aquatic animals such as filtering fish was also discussed