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Primary productivity and net-phytoplankton composition in the Tianjin nearshore waters of Bohai Bay from 2012 to 2013
YIN Cui-ling, ZHANG Qiu-feng, NIU Fu-xin, SHI Hai-ming, XU Yu-shan, TU Jian-bo
Primary productivities and features of the phytoplankton composition in the nearshore waters of Tianjin from 2012 to 2013 were studied. In spring, the primary productivities were 2.20 to 23.18 mgC/(m
2·d), and the average value was 9.54 mgC/(m
2·d), while in summer, the primary productivities were 6.37 to 138.37 mgC/(m
2·d), and the average value was 44.13 mgC/(m
2·d), which were lower than those from 1982 to 1983 and from 1992 to 1993. The horizontal distribution of primary productivities in Tanggu was higher in spring, while those in Beitang and Hangu were higher in summer. Total 2 phyla including 59 species of phytoplankton were commonly found in the survey area, in which 83.1% were diatoms and 16.9% were dinoflagellates. The dominant species were
Rhizosolenia delicatula, Ditylum brightwellii, Bidduiphia sinensis,
Skeletonema costatum,
Chaetoceros curvisetus,
Nitzschia pungens, Leptocylindrus danicus and Eucampia zoodiacus. Phytoplankton cell abundance from 2012 to 2013 was from 3.32×10
3 to 3.85×10
7 cell/m
3 in spring and 2.48×10
6 to 4.65×10
9 cell/m
3 in summer, which was higher than that in spring clearly. The horizontal distribution of phytoplankton cell abundance in north and south of Tianjin nearshore waters was higher than that in the middle, which was due to the river distribution. Shannon-Wiener index of phytoplankton community average value was 1.865 in spring and 1.560 in summer. Features of the phytoplankton community form 2012 to 2013 were mainly influenced by depth, COD, pH, DO and phosphorus.
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