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| Eutrophication analysis of three medium reservoirs in the eastern of Guangdong province |
| Long Sisi, Lin Qiuqi, Hu Ren, Xie Shutao, Han Boping |
| Institute of Hydrobiology, Jinan University, Guangzhou, 510632 |
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Abstract The eutrophication of three medium reservoirs locating in the eastern of Guangdong Province:Heshui reservoir, Hexi reservoir and Shatian reservoir, was investigated in flood season and dry season of 2000. The results showed that the three reservoirs were mesotrophic. The concentrations of total nitrogen, total phosphor and chlorophyll a in the three reservoirs were in ranges of 0.16-l.58mg·L-1, 0.034-0.15mg·L-1 and 0.732-6.57mg·m-3, respectively. Microcystis sp., Melosira granulate and Cyclotella meneghiniana were the dominant species. The trophic status indices(TSIs) of Heshui reservoir and Hexi reservoir were nearly 40, higher than that of Shatian reservoir, which were around 30. The seasonal dynamics of trophic status index is different among the three reservoirs. In both Heshui reservoir and Hexi reservoir, the TSIs were higher in the flood season than in the dry season. In contrast, the TSIs of Shatian reservoir were lower in the flood season than in the dry season. The difference in the seasonal dynamics between the reservoirs indicated that watershed has varied impacts on the eutrophication of the three reservoirs.
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Received: 25 April 2002
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