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Nutrient Fluxes Across Sediment-Water Interface In Bohai Bay Coastal Zone, China, Di Mu, Dekui Yuan, Huan Feng, Fangwei Xing, Fang Yenn Teo, Shuangzhao Li

Department of Earth and Environmental Studies Faculty Scholarship and Creative Works

Sediment cores and overlying water samples were collected at four sites in Tianjin Coastal Zone, Bohai Bay, to investigate nutrient (N, P and Si) exchanges across the sediment-water interface. The exchange fluxes of each nutrient species were estimated based on the porewater profiles and laboratory incubation experiments. The results showed significant differences between the two methods, which implied that molecular diffusion alone was not the dominant process controlling nutrient exchanges at these sites. The impacts of redox conditions and bioturbation on the nutrient fluxes were confirmed by the laboratory incubation experiments. The results from this study showed that the nutrient …