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| Distribution of Chlorophyll-a and phosphorus in subtropical reservoirs, South China |
| Hu Ren, Lin Qiuqi, Duan Shunshan, Han Boping |
| Research center of Hydrobiology, Jinan University, Guangzhou 510632 |
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Abstract Chlorophyll-a and phosphorus were measured in 19 reservoirs in Guangdong province, South China in flood and dry seasons of 2000. The results showed that Liuxihe reservoir, Xinfengjiang reservoir, Gongping reservoir and Baipenzhu reservoir, which located in the up-stream of the rivers, had low concentration of phosphorus and chlorophyll-a all the year. On the contrary, Qiyeshi reservoir, Shiyan reservoir and Hedi reservoir as well as Dajingshan reservoir, which located in down-stream of the rivers or located in Leizhou Peninsula, where is well developed farm area, had high concentration of both phosphorus and chlorophyll-a. The other reservoirs had obvious seasonal patten: the concentration of phosphorus were higher in the flood season than in the dry season. Phosphorus limitation was more serious in a dry season, which caused a significant change in the phytoplankton species composition from a flood season to a dry season. The dominant species in the flood season had a high half-saturation concentration of phosphorus, and they lost the advantage in the dry season. The species, Microcystic spp. and Melosira spp., which have a low half-saturation concentration of phosphorus dominate in both the flood and the dry seasons. The correlation coefficient between PO43--P and chlorophyll a was higher in dry season than in flood season, and higher near the dam than in the riverine. It was higher than the correlation coefficient between TP and chlorophyll a concentrations.
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Received: 25 August 2002
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