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《Environmental Science》 2007-07
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Exchange Rates of Dissolved Nutrients at the Sediment-Water Interface Before and After Diatom Bloom in the East China Sea in Spring

HU Ji,ZHANG Chuan-song,WANG Xiu-lin,WANG Jiang-tao(Key Laboratory of Marine Chemistry Theory and Technology,Ministry of Education,Ocean University of China,Qingdao 266100,China)  
Exchange rates of dissolved nutrients at the sediment-water interface were studied before and after diatom bloom from March to May in the East China Sea in 2005.Intact sediment cores which were sampled at 10 sites were incubated on board,and exchange rates were calculated in the function method.It was shown that sediment absorbed NO~-_3-N before bloom with the exchange rate ranging from(-1.33)(mmol/(m~2·d)) to-0.68(mmol/(m~2·d)).The sediment released NO~-_3-N after bloom with the exchange rate ranging from-0.69(mmol/(m~2·d)) to 0.82 (mmol/(m~2·d)).NH~+_4-N was almost released from sediment with the exchange rate ranging from-0.65(mmol/(m~2·d)) to 1.46(mmol/(m~2·d)),and the rate was higher before bloom than that after bloom.NO~-_2-N moved into sediment all along except at Zc17 with the exchange rate ranging from-0.09(mmol/(m~2·d)) to 0.05(mmol/(m~2·d)), and the rate was a little higher after bloom than that before bloom.SiO~(2-)_3-Si was released from sediment all the time with the exchange rate ranging from 0.85 mmol/(m~2·d) to 9.23(mmol/(m~2·d)),and the rate was higher after bloom than that before bloom.The sediment absorbed PO~(3-)_4-P before bloom with the exchange rate ranging from(-0.06)(mmol/(m~2·d)) to-0.01(mmol/(m~2·d)),but released PO~(3-)_4-P after bloom with the exchange rate ranging from 0(mmol/(m~2·d)) to 1.26(mmol/(m~2·d)).PO~(3-)_4-P and NO~-_3-N which were absorbed by sediment in spring restricted the diatom bloom,but their release from sediment after diatom bloom may make a great contribution to subsequent dinoflagellate bloom.
【Fund】: 科技部国际科技合作重点项目(2004DFA03600);; 国家重点基础研究发展规划(973)项目(2001CB409703)
【CateGory Index】: X55
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