J4 ›› 2010, Vol. 45 ›› Issue (5): 12-18.

• Articles • Previous Articles     Next Articles

Population characteristics and seasonal variations of  phytoplankton in Nansi Lake

LIU Qian-hui1, PEI Hai-yan1, 2,*, HU Wen-rong1,2, XIE Jun3   

  1. 1. School of Environmental Science and Engineering, Shandong University, Jinan 250100, Shandong, China;
    2. Research Centre on Environmental Science and Engineering, Shandong Province, Jinan 250061, Shandong, China;
    3. Shandong Environmental Monitoring Central Station, Jinan 250013, Shandong, China
  • Received:2009-11-16 Online:2010-05-16 Published:2010-05-24

Abstract:

Phytoplankton are an important biological indicator for water quality assessment. To investigate the water quality of Nansi Lake, the population composition, quantity and dominant species of phytoplankton were studied from June 2008 to May 2009. 8 phyla, 59 genera and 117 species have been identified from 5 monitoring stations based on a monthly sampling. The species numbers of Chlorophyta and Bacillariophyta accounted for the total species number were 48.7% and 23.9%, respectively. There were many more species in summer and autumn than that in winter and spring. The seasonal variations of phytoplankton density were the same as that of species number. The predominant indices were not high, ranging from 0.04 to 0.35, and there were 23 predominant species including Chlorella vulgaris, Scenedesmus dimorphus and  Aulacoseira granulata. The phytoplankton diversity and evenness indices varied from 1.56 to 2.36, and 0.59 to 0.84, respectively. It could be concluded that the phytoplankton population structure in Nansi Lake is complex, and the stability of the phytoplankton population composition and quantitative distribution showed a high degree in Nansi Lake. The phytoplankton population characteristics changed significantly compared with the data in 1980s.
 

Key words: phytoplankton; population composition; seasonal variations; Nansi Lake

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