作　　者： ; ; ; ; ;

机构地区： 暨南大学生命科学技术学院水生生物研究所

出　　处： 《生态科学》 2009年第3期247-252,共6页

摘　　要： 结合在一个热带浅水湖泊——惠州西湖的一个子湖——平湖所实施的底泥疏浚工程，对比分析了底泥疏浚前后部分水质指标和后生浮游动物群落的种类组成、丰度、生物量和物种多样性的变化，研究了底泥疏浚对平湖后生浮游动物群落的影响。结果表明：疏浚后平湖的部分水质指标较疏浚前有所恶化；后生浮游动物的丰度由疏浚前的186．08ind·L^-1增加到659．22ind．·L^-1，其中轮虫和桡足类的丰度显著增加，枝角类丰度降低；生物量由1．49mg．·L^-1增加到3。72mg．·L^-1，其中轮虫和枝角类的生物量均有所增加，但其在浮游动物总生物量中所占比例却有所下降，桡足类的生物量则由0．08mg·L^-1增加到0．80mg·L^-1，在总生物量中所占比例明显上升；Shannon-Weaner指数由2．24下降到1．84。底泥疏浚造成水体营养盐的上升，促进了浮游植物的生长，从而为浮游动物的种群发展提供了充足的食物供给，加之由于干湖底泥疏浚所导致的鱼类捕食压力的减少，多种因素共同导致了疏浚后平湖后生浮游动物种群的生物量、丰度和个体大小的增加。结果看，惠州西湖的清淤不能有效改善水质，也不能恢复生态系统，湖泊恢复必须结合其他措施。 Effects of sediment dredging on communities of metazoan zooplankton in Pinghu, a sublake of a tropical shallow lake, Huizhou West Lake, was studied by comparing the data of water quality and zooplankton species composition, abundance, biomass and biodiversity before and after sediment dredging. The result showed that the water quality was deteriorated; Total abundance of metazoan zooplankton increased from 186.08 ind.·L^-1 to 659.22 ind.·L^-1, of which the abundances of rotifers and copepods increased, but cladocerans decreased. Total zooplankton biomass increased from 1.49 mg·L^-1 to 3.72mg·L^-1 remarkably. Although all metazoan zooplankton increased in biomass, relative proportion of rotifers and cladocerans decreased due to the significant increase in copepods. Shannon-Weaner biodiversity index decreased from 2.24 before sediments dredging to 1.84 after the dredging. Such changes in zooplankton communities are likely due to the enhanced phytoplankton growth by the increase in nutrients, nutrients; reduced fish predation resulted from fish abundance dilution after dredging. The results of present paper suggest that sediment dredging can neither improve water quality of Huizhou West Lake, nor restore the lake ecosystem. Lake restoration has to include other measures.

关 键 词： 惠州西湖 热带 浅水湖泊 底泥疏浚 后生浮游动物 鱼类

领　　域： [生物学]