Sediment-water fluxes of nutrients in the Yellow Sea and the East China Sea
东、黄海沉积物-水界面营养盐交换速率的研究

Sediment-water fluxes of dissolved nutrient were investigated at 5 stations(A2,E2,E4,E5,E6) in the Yellow Sea and the East China Sea in October 2000 and May 2001.The benthic fluxes of nutrient species were determined by incubating the sediment core samples with bottom seawater bubbled with air or nitrogen.In the Yellow Sea,at station A2,the fluxes of dissolved nutrient expect NO3-,SiO32-all removed from sediment to overlying water.At station E2,the fluxes of dissolved nutrient expect NH4 ,DIN all removed from sediment to overlying water.In the East China Sea,the fluxes of NO3-,PO43-,and total dissolved phosphorus(TDP) were removed from overlying water to sediment,the fluxes of NH4 and SiO32-were removed from sediment to overlying water.The fluxes of NO3-and TDP,NH4 under anoxic condition are higher than those under oxic condition,the fluxes of PO43-and SiO32-are consistent under anoxic and oxic conditions.In the Yellow Sea and the East China Sea,the sediment accounts for 13%,10%~18% of the primary production.Compared with the riverine inputs and atmosphere adoption,in the Yellow Sea and the East China Sea,90%,86% SiO32-came from sediment,which is the source of SiO32-.The DIN and PO43-were uptaken by sediment.