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| Nutrient release process during decomposition of submerged macrophytes (Hydrilla verticillata Royle) |
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Abstract The decaying process of submerged macrophytes (Hydrilla verticillata) was simulated in laboratory. Results showed that the plant decayed rapidly and released a lot of nutrients C (81.31%), N(81.62 %) and P (85.94%) into the water at the beginning of experiment. After a period of time, most of the phosphorus and part of nitrogen was released into sediment, whereas part of nitrogen escaped out of the water as gas. The decomposition of plant released large amounts of organic carbon making the water anaerobic. Both of the anaerobic conditions resulted from decomposition and high TOC supply are benefitial to nitrogen removal by denitrification. However, the larger biomass residues of submerged plants should be controlled to avoid secondary pollution caused by excessive decomposition of submerged plants.
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Received: 30 December 2013
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