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[1]DENG Jinyan.Effect of Development of Water Conservancy on Seasonal Community Structure of Phytoplankton and Water Quality of Ertan Reservoir, Sichuan Province[J].Research of Soil and Water Conservation,2016,23(01):349-355.

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Effect of Development of Water Conservancy on Seasonal Community Structure of Phytoplankton and Water Quality of Ertan Reservoir, Sichuan Province

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 23 Number of periods: 2016 01 Page number: 349-355 Column: Public date: 2016-02-28

Title:: Effect of Development of Water Conservancy on Seasonal Community Structure of Phytoplankton and Water Quality of Ertan Reservoir, Sichuan Province

Author(s):: DENG Jinyan; Department of Architectural Engineering, Neijiang Vocational & Technical College, Neijiang, Sichuan 641100, China

Keywords:: water conservancy development; Ertan reservoir; phytoplankton; water quality; seasonal change

CLC:: Q178;X524

DOI:: -

Abstract:: Studies on the effect of development of Ertan reservoir water conservancy on seasonal community structures of phytoplankon and water quality, including species richness, density and biodiversity indices, and correlation analysis between community index of phytoplankton and water quality parameters were carried out from 2010 to 2014. The results indicated that: (1) 251 species of algae were found in water conservancy development zone, of which 35.86% were Chlorophyta, and 166 species of algae were found in CK zone, of which 40.96% were Chlorophyta, there was great seasonal variation in phytoplankton which showed the species were greater in summer and autumn than those in spring and winter; (2) the Shannon-wiener diversity index (H), evenness index (J_P) and richness index (S) of water conservancy development zone and CK first increased and then decreased with the change of season, which showed these indices were higher in summer and autumn than those in spring and winter, while the density of phytoplankton was the lowest in autumn, the density and richness index of phytoplankton in different seasons showed the sequence: water conservancy development zone > CK, while Shannon-wiener diversity index and evenness index presented the opposite trend; (3) the water temperature, pH, TN, NH₄⁺-N, TP, potassium permanganate index, BOD₅ and COD_cr first increased and then decreased with the change of season, which showed these parameters were higher in autumn than those in spring and winter, while transparency showed the V-shape trend with the highest in spring and the lowest in autumn, and water temperature and TP concentration had no significant differences between water conservancy development zone and CK, the water temperature, pH, TN, NH₄⁺-N, TP, potassium permanganate index, BOD₅ and COD_cr in different seasons showed the order: water conservancy development zone > CK with local fluctuation, and the gap was smaller in winter, which indicated that water conservancy development had little effect on water quality in winter; (4) correlation analysis showed that the water temperature and TN concentration had significantly or extremely significantly positive correlation with phytoplankton diversity and pH was significantly negative correlation with phytoplankton diversity, which suggested that water temperature and TN concentration were the main influencing factors on phytoplankton diversity in Ertan reservoir.

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