天河浮游植物属类组成及多样性分析

Species Composition and Diversity of Phytoplankton in Tianhe River

通过2016~2018年天河观音断面浮游植物监测数据,运用指示生物法、优势属群法、多样性指数法解析其浮游植物变化规律,检测表明天河观音断面浮游植物有7门45属,其中属类最多的是绿藻门和硅藻门,分别占28.89%、44.44%;分析表明天河观音断面丰富度指数在0.89至1.67之间、多样性指数值在1.32至2.49之间、均匀性指数在0.45至0.96之间;天河观音断面浮游植物密度3.62~364.12万个/L之间变动;研究还发现浮游植物优势属密度占总密度比例和多样性指数有很好的负相关关系;当浮游植物优势属密度占总密度在68%以上时,水质受到重度污染。

Through the phytoplankton monitoring data at Guanyin section in Tianhe River from 2016 to 2018, the variation of phytoplankton was analyzed by means of indicator biological method, dominant group me-thod and diversity index method. It is found that there are 7 doors and 45 genera of phytoplankton. Among them, the most species are green algae gate and silicon algae gate, accounting for 28.89% and 44.44%, respectively. The richness index at Guanyin section is between 0.89 and 1.67, the diversity index is between 1.32 and 2.49, and the evenness index is between 0.45 and 0.96;the phytoplankton density is 3.62 to 364.12 ×105/L. It was also found that the proportion of dominant genera density to total density and diversity index were negatively correlated, and the water quality was seriously polluted when the density of dominant genera was above 68%.