Nutrient fluxes across sediment-water interface in Bohai Bay Coastal Zone, China.

Autor: Mu D; Department of Mechanics, Tianjin University, Tianjin 300072, China; School of Marine Science and Engineering, Hebei University of Technology, Tianjin 300130, China., Yuan D; Department of Mechanics, Tianjin University, Tianjin 300072, China. Electronic address: dkyuan@tju.edu.cn., Feng H; Department of Earth and Environmental Studies, Montclair State University, Montclair, NJ 07043, USA., Xing F; Department of Mechanics, Tianjin University, Tianjin 300072, China., Teo FY; Department of Irrigation and Drainage, Kuala Lumpur 50626, Malaysia., Li S; Department of Mechanics, Tianjin University, Tianjin 300072, China.
Jazyk: angličtina
Zdroj: Marine pollution bulletin [Mar Pollut Bull] 2017 Jan 30; Vol. 114 (2), pp. 705-714. Date of Electronic Publication: 2016 Oct 29.
DOI: 10.1016/j.marpolbul.2016.10.056
Abstrakt: 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 fluxes measured directly from the incubation experiment were more reliable than that predicted from the porewater profiles. The possible impacts causing variations in the nutrient fluxes include sewage discharge and land reclamation.
(Copyright © 2016 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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