Nutrient fluxes across sediment-water interface in Bohai Bay Coastal Zone, China.
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.
Department of Mechanics, Tianjin University, Tianjin 300072, China; School of Marine Science and Engineering, Hebei University of Technology, Tianjin 300130, China.
Di
D
Mu
Department of Mechanics, Tianjin University, Tianjin 300072, China. Electronic address: dkyuan@tju.edu.cn.
Dekui
D
Yuan
Department of Earth and Environmental Studies, Montclair State University, Montclair, NJ 07043, USA.
Huan
H
Feng
Department of Mechanics, Tianjin University, Tianjin 300072, China.
Fangwei
F
Xing
Department of Irrigation and Drainage, Kuala Lumpur 50626, Malaysia.
Fang Yenn
FY
Teo
Department of Mechanics, Tianjin University, Tianjin 300072, China.
Shuangzhao
S
Li
D061006:Bays / Q000737:chemistry*; D002681:China; D004784:Environmental Monitoring / Q000379:methods*; D019015:Geologic Sediments / Q000737:chemistry*; D008962:Models, Theoretical; D009584:Nitrogen / Q000032:analysis; D010758:Phosphorus / Q000032:analysis; D012621:Seasons; D012623:Seawater / Q000737:chemistry*; D012825:Silicon / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000032:analysis*
D014874:Water Pollutants, Chemical; D010758:Phosphorus; D009584:Nitrogen; D012825:Silicon
Environmental factors; Nutrient flux; Sediment-water interface; Tianjin Coastal Zone, Bohai Bay