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| Influence of macrophytes on water quality in the eastern bays of Lake Taihu, China |
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Abstract Effects of macrophyte growth and water quality distribution factors such as total nitrogen (TN), total phosphorus (TP), transparency and chlorophyll a were studied in an investigation on specie compositions, coverage of macrophyte and physicochemical properties of water body in eastern bays of Lake Taihu (Gonghu Bay, Guangfu Bay and Yuang Bay). The results showed that Potamogeton wrightii Morong was the most popular specie amony three bays. The coverage of macropyhte was spatially different among survey sites, with the coverage ranged from 4.8% to 95.2%. Nutrients in the macrophyte-coverage area were significantly lower than those in the non-macrophyte area with a decrease of TN and TP concentration of 39% and 51%, However, being locates at the border of Microcystis bloom region, the macrophytes also easy to catch the floating bloom, in which the submerged macrophytes showed higher ability to catch the bloom than floating macrophytes did. Therefore, different aquatic vegetation zones of Lake Taihu need the corresponding strategies to restore water quality.
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Received: 12 February 2014
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