Benthic nutrient recycling in shallow coastal waters of the Bohai Sea  

作　　者：刘素美 张经 陈洪涛 T.Raabe 

机构地区：[1]College of Chemistry and Chemical Engineering, Ocean University of Qingdao, Qingdao 266003, China [2]State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China [3]Institute of Biogeochemistry and Marine Chemistry, University of Hamburg, Martin-Luther-King-Platz 6, 20146 Hamburg, Germany

出　　处：《Chinese Journal of Oceanology and Limnology》2004年第4期365-372,共8页中国海洋湖沼学报（英文版）

基　　金：This study was funded by NSFC (Nos. 40036010 and 40206017); and the Special Funds from National Key Basic Research Program of P. R. China (No. 2001CB409703).

摘　　要：Sediment-water fluxes of N and P species in the Bohai Sea were investigated in Septem-ber-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. -2NO,+4NH, dissolved organic nitrogen (DON) and phosphorus (DOP), total dissolved nitrogen (TDN) and phosphorus (TDP), and -34PO showed a net exchange flux from seawater to sediment, while -3NO, dissolved inorganic nitrogen (DIN) and -23SiO 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.Sediment-water fluxes of N and P species in the Bohai Sea were investigated in Septem-ber-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. -2NO,+4NH, dissolved organic nitrogen (DON) and phosphorus (DOP), total dissolved nitrogen (TDN) and phosphorus (TDP), and -34PO showed a net exchange flux from seawater to sediment, while -3NO, dissolved inorganic nitrogen (DIN) and -23SiO 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.

关 键 词：sediment-water exchange nutrient elements adsorption RELEASE Bohai Sea 

分 类 号：P731.2[天文地球—海洋科学]