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| Changes of Submerged Macrohhyte Community Structure and Water Quality in the Process of Ecosystem Restoration of a Shallow Eutrophic Lake |
| LIU Yu-chao1,2, Yu Jin-lei1, Chen Liang1, LIU Zheng-wen1,3 |
| 1. Institute of Hydrobiology, Jinan University, Guangzhou 510632, P. R. China; 2. Department of Life Science, Zaozhuang University, Zaozhuang 277160, P. R. China; 3. Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China |
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Abstract Submerged macrophyte coverage, percentage of Vallisneria natans and Hydrilla verticillata, and concentrations of total nitrogen (TN)、total phosphorus (TP) and Chl a, were studied in a shallow eutrophic lake. The results showed that: 1) Percentage of Vallisneria natans increased from 30% to 95%, while Hydrilla verticillata decreased from 60% to 5% before May, respectively ; 2) Content of nutrients and chl a reduced quickly with the stabilization of ecosystem after rapid increasing period in the process of transition, concentrations of TN、TP and Chl a reduced to about 0.840 mg·L-1、0.028 mg·L and 2.562μg·L-1, respectively, Secchi depth (SD) increased to 120cm, water quality improved obviously; 3) Our results indicated that ecosystem of Nan Lake was at a clear water state dominated by Vallisneria natans which shifted from turbid state dominated by phytoplankton, after a short interim state dominated by Hydrilla verticillata, gradually.
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Received: 25 October 2008
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