Nguyen Thi Dung, Vu Duy Hung, Nguyen Thuy Lien, Le Thu Ha, Pham Thi Dau

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Abstract: Phytoplankton and water samples were repeatedly collected in November 2015; February and May 2016 from 12 sampling sites in Truc Bach lake. 115 species and subspecies of phytoplankton had been recorded. They belong to 5 divisions (Cyanobacteriophyta, Bacillariophyta, Pyrrophyta, Euglenophyta, Chlorophyta). Cyanobacteriophyta hadthe largest density (23 species, 8021 cells/l). Based on Palmer index (Pollution index), Shannon - Weiner index (Diversity index)and physiochemical and biological parameters, we found that Truc Bach lake was polluted with organic substances, especially substances that are hard to decompose and nitrogenous sewage.

Keywords: Phytoplankton, biodiversity, water quality, Truc Bach lake.


[1] Robert Edward Lee, Phycology (3rd edition), Cambridge university press, 1999.
[2] Duong Duc Tien,Taxonomy of Cyanobacteria in Vietnam, Agriculture Publish house, Hanoi, 1996.
[3] Duong Duc Tien, Vo Hanh,Freshwater Algae in Vietnam-Taxonomy of Chlorophyta, Agriculture Publish house, Hanoi, 1997.
[4] Nguyen Van Tuyen,Algal diversity of freshwater Vietnam, Prospect and Challenge, Agriculture Publish house, Ho Chi Minh city, 2003.
[5] Mary Ann H. Franson, Standard methods for the Examination of Water and Waste water, American Public heath association, 1995.
[6] WilhmJ.L and Doris, “Biological parameters for water quality criteria”,Bioscience 18 (1968) 477.
Ministry of Resources and Environment, National technical regulations on surface water quality, QCVN 08:2008/BTNMT.