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| Dynamics of the trophic state and phytoplankton community of a small reservoir in South China |
| LIU Lei, LEI La-mei, XIAO Li-juan, HAN Bo-ping |
| Institute of Hydrobiology, Jinan University, Guangzhou 510632, China |
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Abstract Small reservoirs play an important role in city fresh drinking water supply in South China.In order to understand the dynamics of trophic state and phytoplankton community in these reservoirs,Mutouchong Reservoir located in Zhuhai City,a typical small reservoir with a volume of 0.508 106 m3,was investigated in April,August and December,2006.The concentrations of TN,TP and chlorophyll a ranged from 0.34 to 0.71 mg·L-1,0.011 to 0.019 mg.L-1,9.18 to 21.1mg·m-3,respectively,and SD ranged from 0.6 to 1.5m.The TSIM index,based on the above four factors,ranged from 40 to 50,and indicated that the Mutouchong Reservoirs was mestrophic.52 species were observed and most of them were from Bacillariophyta and Chlorophyta.The biomass of phytoplankton ranged from 4.17 mg·L-1 to 5.38 mg·L-1,and the biomass in spring and summer was higher than that in winter.Phytoplankton was primarily dominated by Aulacoseira granulate and Monoraphidium sp.in spring,and then by Cosmarium spp.and A.granulate.in summer.In winter,filamentous cyanobacteria,Cylindrospermopsis rackiborskii became the dominant species,and this was possibly related to the decrease of nitrogen.In Mutouchong reservoir,nutrient was one of the possible factors controlling the seasonal variation of phytoplankton.
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Received: 25 April 2008
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