中文摘要：

通过对水华过程的原位观测，运用分子生物学手段对太湖藻类水华过程中微生物的动态变化进行了跟踪测定，PCR—DGGE分析结果显示，水华过程中，水体中细菌的种群结构发生了较大变化，细菌的种类和数量都有明显改变；荧光直接计数水华过程中细菌数量变化表明：在5-10月份水华发生过程中，水体中细菌总量呈逐渐上升趋势（R2=0．836）；运用MPN法，对磷分解细菌分析表明，水华发生前期水体中磷分解细菌的数量变化不明显，而在水华后期数量有显著增加趋势．

英文摘要：

In-situ observation of the course of bloom formation is conducted, and the bacteria dynamics during the microsystis bloom formation by molecule biological methods is derived. The analytical results of PCR-DGGE imply that the community composition of the aquatic bacteria varies during the blooming course, the biomass of bacterioplankton increases with the algae blooming （R2=0.836） from May to October during which bloom occur. However, significant variation of the number of phosphorus-degrading bacteria is not noted at the beginning of blooming, but the trend of increasing can be found at the end of the bloom, indicating that after the decomposing of algae, the particulate organic phosphorus become the new nutrient matter for the metabolism of organic phosphorus-degrading bacteria.