Benthic nutrient recycling in shallow coastal waters of the Bohai Sea

Sediment-water fluxes of N and P species in the Bohai Sea were investigated in September-October 1998 and April-May 1999. The benthic fluxes of nutrient species were determined by incubating sediment core samples with bottom seawater bubbled with air or nitrogen.NO2-,NH4+,dissolved organic nitrogen (DON) and phosphorus (DOP), total dissolved nitrogen (TDN) and phosphorus (TDP), and showed a net exchange flux from seawater to sediment, while , dissolved inorganic nitrogen (DIN) and were released from sediment to seawater in the Bohai Sea. Sediment-water nutrient exchange increases DIN and reduces the phosphorus load in the Bohai Sea. The release of silicate from sediment to overlying seawater reduces potential silicate limitation of primary production resulted from decrease of riverine discharge. The exchange flux of nutrients showed no obvious seasonal variation. The present study showed that the concentrations and composition of nutrients in the water column were affected by suspended sediment, and that not all the exchangeable phosphate in sediment could be released via sediment resuspension.

作 者： Liu Sumei ZHANG Jing Chen Hongtao T.Raabe   作者單位： Liu Sumei,Chen Hongtao(College of Chemistry and Chemical Engineering, Ocean University of Qingdao, Qingdao 266003, China)

ZHANG Jing(State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China)

T.Raabe(Institute of Biogeochemistry and Marine Chemistry, University of Hamburg, Martin-Luther-King-Platz 6, 20146 Hamburg, Germany) 

刊 名： 中國海洋湖沼學(xué)報(bào)（英文版）  ISTIC SCI 英文刊名： CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY  年，卷(期)： 2004 22(4)  分類號(hào)： P7  關(guān)鍵詞： sediment-water exchange   nutrient elements   adsorption   release   Bohai Sea  

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