[Community structure characteristics of phytoplankton and related affecting factors in Hengshan Reservoir, Zhejiang, China].

In order to reveal the community structure characteristics of phytoplankton and the relationships with environmental factors in Hengshan Reservoir, the phytoplankton species composition, abundance, biomass and 12 environmental factors at 4 sampling sites were analyzed from March 2011 to February 2012. A total of 246 phytoplankton species were identified, which belong to 78 genera and 7 phyla. The dominant species were Melosira varians, M. granulate, Cyclotella meneghiniana, Asterianella formosa, Synedra acus, Achnanthes exigua, Ankistrodesmus falcatus, Oscillatoria lacustris, Cryptomonas erosa, Chroomonas acuta, Phormidium tenue and Microcystis aeruginosa, etc. Seasonal variations of species were obvious. The annual abundance and biomass of the phytoplankton were 0.51 x 10(5)-14.22 x 10(5) ind x L(-1) and 0.07-1.27 mg x L(-1), respectively. The values of the Margelef index, Pielou index and Shannon index of the phytoplankton community were 1.10-3.33, 0.26-0.81 and 0.51-2.38, respectively. The phytoplankton community structure was of Bacillariophyta-Cryptophyta type in spring and winter, of Chlorophyta-Cyanophyta type in summer, and of Bacillariophyta type in autumn. Canonical correlation analysis (CCA) showed that temperature, transparency, chemical oxygen demand and pH had the closest relationships with the phytoplankton community structure in the reservoir. Water quality evaluation showed that Hengshan Reservoir was in a secondary pollution with a meso-trophic level.

[1]  M. Cannell,et al.  Radiation Interception and Productivity of Willow , 1987 .

[2]  J. Palmer.  The measurement of leaf area in apple trees , 1987 .

[3]  S. Wertheim,et al.  Comparison of single-row and multi-row planting systems with apple, with regard to productivity, fruit size and colour, and light conditions , 1986 .

[4]  R. Fogel.  Roots as primary producers in below-ground ecosystems , 1985 .

[5]  D. Atkinson.  Spatial and temporal aspects of root distribution as indicated by the use of a root observation laboratory , 1985 .

[6]  P. J. Wood,et al.  World Forest Biomass and Primary Production Data. , 1983 .

[7]  J. Landsberg,et al.  Eco-Physiology of Apple Trees: Dry Matter Production and Partitioning by Young Golden Delicious Trees in France and England , 1979 .

[8]  P. Biscoe,et al.  Radiation absorption, growth and yield of cereals , 1978, The Journal of Agricultural Science.

[9]  A. Preston.  SIZE CONTROLLING APPLE ROOTSTOCKS , 1978 .

[10]  A. Preston.  A bed system of planting apples on the dwarfing rootstock M.27 , 1978 .

[11]  J. W. Palmer,et al.  SEASONAL LIGHT INTERCEPTION AND CANOPY DEVELOPMENT IN HEDGEROW AND BED SYSTEM APPLE ORCHARDS , 1977 .

[12]  J. W. Palmer,et al.  Effects of Shade on the Growth and Cropping of Apple Trees. II. Effects on Components of Yield , 1977 .

[13]  E. Verheij.  Competition in apple, as influenced by alar sprays, fruiting, pruning and tree spacing , 1972 .

[14]  D. J. Avery.  EFFECTS OF FRUITING ON THE GROWTH OF APPLE TREES ON FOUR ROOTSTOCK VARIETIES , 1970 .