Session1: River Engineering and Management

1-16

Title: THE ROLE OF SUBMERGED MACROPHYTES IN THE REGULATION OF INTERNAL NITROGEN AND PHOSPHORUS RELEASE

Jing Wan, Hong Peng, Xu Zhang, Wanshun Zhang, Xiaomin Chen

Submerged macrophytes play pivotal roles in the regulation of nitrogen (N) and phosphorus (P) release at the water-sediment interface, however, it remains unclear internal nitrogen and phosphorus release during the growth of submerged macrophytes. This study aims to have a better understanding of N and P release characteristics and their affecting factors during the growth of submerged macrophytes in an ecological microcosm experiment. The results showed that the average N and P release rates at the water-sediment interface in different treatments were negative and their absolute values ranked with the order of V treatment (treatment with Vallisneria natans) > M treatment (treatment with Myriophyllum verticillatum) > control (without planting submerged macrophytes). Results in this study are useful to understand internal N and P release under the regulation of submerged macrophytes, and provide a theoretical basis for the prevention and control of the internal pollution.