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Duong Thi Thuy, Le Thi Phuong Quynh, Ho Tu Cuong, Vu Thi Nguyet, Hoang Thi Thu Hang, Dang Dinh Kim, Lu XiXi (2014).

Phytoplankton community structure and water quality of Red River, VietnamJ. Viet. Env, Vol 6(1), pp. 27-33, DOI: 10.13141/jve.vol6.no1.pp27-33


Abstracts
This study aimed to describe the distribution and relative abundance of the phytoplankton obtainedduring the two seasons (rainy and dry seasons) from the Red river system. The water and phyto-plankton samples were monthly collected during the year 2012 at four sampling stations along theRed River (Yen Bai, Vu QuangHoaBinh,and Ha Noi) . Environmental variables (e.g. tempera-ture, dissolved oxygen, pH, suspended solids, conductivity, TDS, NO3-N, NH4-N, PO4-P, TotalPhosphorus; and DOC) and phytoplankton (e.g. cell density and relative abundant species) wereanalyzed. Six phytoplankton classes were identified with the Bacillariophyceae dominating in thephytoplankton community. A distinct seasonal variation in phytoplankton structure was observedwith high cells density in dry season and low values in rainy season. PCA (Principal ComponentAnalysis) showed that suspended solid factor that governed the temporal and spatial distribution ofphytoplankton structure in the Red River system.
,"serif";color:black;mso-ansi-language: VI'>-1; Mn: 2 – 35 µg.l-1; and Fe: 160 – 2370 µg.l-1. Most of the mean values of DHM were lower than the allowed values of the QCVN 08:2008/BTNMT, but at several points of time, several DHM (e.g. Fe, Cd, Pb) contents exceeded the allowed values. The Total Coliform (TC) and Fecal Coliform (FC) den-sities varied in a high range: TC: 23 to 13,000MPN.100ml-1 and FC: 0 to 1,600MPN.100ml-1 andthey exceeded the allowed values QCVN 08:2008/BTNMT at several points observed. The dis-solved organic carbon (DOC) contents were in low level and the particulate organic carbon (POC) content mainly derived from soil organic leaching and erosion in the basin. The results underlined the need for regularly monitoring the river water quality, and there should be some effective solu-tions to manage and treat the waste sources in order to provide safe water for different actual pur-poses use in the Red River basin.
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