Phytoplankton community structures of water
environmental were monitored from July to August 2010 in
Zhalong Wetland in northeast China. Phytoplankton community
was obtained from samples taken from 341 stations
with different environmental conditions. Physicochemical
parameters (chemical oxygen demand, the total nitrogen,
the total phosphorus, chlorophyll
a (Chl-a)) were measured
simultaneously for comparison with phytoplankton samples.
A total of 410 phytoplankton taxa belonging to 7
phyla, 9 classes, 20 orders, 29 families, 79 genera were
obtained. The mean value of trophic state index (TSI) was
49.87 and ranged from 34.89 to 69.12. The dominant
species in the study area included
Anabaena azotica,
Selenastrum
minutum,
Chlorella vulgaris,
Trachelomonas
volvocina,
Navicula radiosa
, and indicator species suggesting
that most of the Zhalong Wetland is mesotrophic.
The TSI, phytoplankton density, Shannon–Wiener index,
Margalef index also indicated that the water quality was a
mesotrophic state in Zhalong Wetland.
