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| Influence of water transfer on the phytoplankton community succession mode in the Chaohu Lake |
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Abstract By establishing the ecosystem dynamics model CAEDYM of Chaohu Lake, and using the observation values of the flow that inflows and outflows the lake as well as the figures of the water quality, hydrology, meteorology, etc. in 2010 to verify the model’s parameter, the ecosystem dynamics model parameters fit for the environmental characteristics of the Chaohu Lake have been determined. The principle of the phosphorus cycle in the model was used to simulate the ecological dynamics cycle of phosphorus, the seasonal succession mode of phytoplankton communities and the influence of water transfer on the phytoplankton community succession mode in the Chaohu Lake. Simulation results show that the succession mode of dominant phytoplankton species in the Chaohu Lake is: chlorophyta dominate in spring, cyanobacteria dominate in summer and autumn, and bacillariophyta dominate in winter. Through the short water transfer in summer, the final TN, and TP in Chaohu spots has got an average decrease of 18.9% and 25.2%, respectively. From Ch1 a calculation, the enforcement of water transfer has apparent effect on improving the west and middle part of the lake, causing a decrease of Ch1 a from its max 69μg/L down to 57μg/L, effectively improving the state of cyanobacteria in Chaohu while showing little effect on the seasonal succession mode of phytoplankton community.
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Received: 05 April 2012
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