天津子牙河浮游植物群落结构特征及水质评价

目的]研究天津子牙河浮游植物群落结构特征与环境因子关系、丰富水质管理等方面的基础资料.方法]显微镜下对2020年天津子牙河4个采样点开展冬、春、夏、秋季样品的浮游植物进行定性鉴定和定量计数,计算其生物密度、优势种、生物多样性指数等,并对其水质进行理化分析.结果]发现浮游植物共7门43种,优势种以硅藻门和蓝藻门为主...

Characteristics of Phytoplankton Community Structure and Water Quality Assessment in Ziya River of Tianjin

【Objective】Explore the relationship between community structure of phytoplankton and the environmental factors as well as the basic data of water quality management in Ziya River.【Method】Based on the water environment and plankton field sampling survey in the winter,spring,summer and autumn of 2020,the surveys were analyzed combined with the biological density,dominant species and biodiversity index.【Result】A total of 43 phytoplankton species were identified,belonging to 7 phyla.Dominant species are mainly from the classes Bacillariophyta and Cyanophyta.The phytoplankton’s abundance of different sampling sites ranged from 5.86×10⁷ to 40.5×10⁷ ind/L in the whole year.The water quality of the whole year was between III and V.Shannon-Wiener diversity index ranged from 0.83 to 2.53,Pielou’s index from 0.25 to 0.68,and Margalef’s index from 0.30 to 0.47.The results of correlation analysis showed that COD_Mn,COD and NH₃-N were the main environmental factors affecting the change of phytoplankton community in Ziya River.【Conclusion】The species composition of phytoplankton in Ziya River was Bacillario-Cyanophyta type.The water quality was good in moderate pollution level.The evaluation of diversity index showed that the water nutrition ranges were from slight pollution to heavy pollution,which indicated that the conditions were prepared for Algal bloom.