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Pak. J. Bot., 47(1): 359-366, 2015.

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COMMUNITY STRUCTURE CHARACTERISTICS OF PHYTOPLANKTON IN ZHALONG WETLAND, CHINA

NANNAN ZHANG ^{1, 2} AND S. SHUYING ZANG^{1 *}

Abstract: In autumn 2010, the phytoplankton samples were collected in Zhalong Wetland. A total of 347 species belonging to 78 genera，6 phyla were identified, Chlorophyta and Bacillariophyta were dominated phytoplankton communities, including 143 species of Chlorophyta, 116 species of Bacillariophyta, 45 species of Cyanophyta, 39 species of Euglenophyta, 3 species of Pyrrophyta, 1 species of Chrysophyta. In the core area 66 genera, 222 species were identified, in the buffer area 63 genera, 210 species were identified, in the experiment area 63 genera, 167 species were identified. The dominant species in Zhalong Wetland included Cyclotella meneghiniana, Chlorella vulgaris, Trachelomonas volvocina, Nitzschia sp.. The average phytoplankton density was 12.13×10⁶ind·L^-1 in Zhalong Wetland, the phytoplankton density of Bacillariophyta was highest (32.82×10⁶ ind·L^-1), and then Chlorophyta (23.73×10⁶ ind·L^-1) and Cyanophyta (11.43×10⁶ind·L^-1), respectively. The results of cluster analysis showed that phytoplankton community structure could be divided into three types, and within-group similarities of phytoplankton community structure was not high, but inter-group non-similarity was high. Based on the species composition, phytoplankton density, phytoplankton pollution indicator, it suggested that Zhalong Wetland was mesotrophic state.

key words: Community structure, phytoplankton, Chlorophyta and Bacillariophyta, Euglenophyta, Pyrrophyta.

¹Key Laboratory of Remote Sensing Monitoring of Geographic Environment, College of Heilongjiang Province,

Harbin Normal University, Harbin, P.R. China 150025

²Modern laboratory centre, College of Heilongjiang Province, Harbin Normal University, Harbin, P.R. China 150025

^*Corresponding author’s e-mail: nannan04141314@163.com ; Tel: +86-451-88060689; Fax: +86-451-88060689