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《Journal of East China Normal University(Natural Science)》 2009-03
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Nutrient fluxes at sediment-water interface in the east Chongming tidal flat in winter

DENG Ke1,YANG Shi-lun2,LIU Su-mei1,ZHANG Jing2(1.College of Chemistry and Chemical Engineering,Ocean University of China,Qingdao Shandong 266100,China;2.State Key Laboratory of Estuarine and Coastal Research,East China Normal University,Shanghai 200062,China)  
Benthic nutrient fluxes and early diagentic processes were investigated in the east Chongming tidal flat of Yangtze estuary in winter.Significantly nutrient influxes from water column to sediment are observed in high marsh:benthic fluxes of NO-3,NO-2,NH+4,PO3-4 and SiO2-3 are(-0.896±0.540)mmol/m2/d,(-0.089±0.049)mmol/m2/d,(-2.002±0.642)mmol/m2/d,(-0.068±0.006)mmol/m2/d and(-1.334±0.381)mmol/m2/d individually(negative indicate nutrient absorption from water column to sediment and positive indicate nutrient release from sediment to water column).The exflux of NO-3((0.203±0.112)mmol/m2/d)and influxes of NO-2((-0.010±0.005)mmol/m2/d)and PO3-4((-0.005±0.002)mmol/m2/d)are observed in middle marsh.In low marsh,only PO3-4((-0.047±0.009)mmol/m2/d)influx is significant and there are large uncertainty in other nutrient fluxes due to strong wave disturbance.Diffusional nutrient fluxes contribute to the benthic nutrient fluxes slightly.Due to benthic flux differences among nutrients,benthic nutrient exchanges promote the growths of N/P and Si/P ratios in water column.
【Fund】: 华东师范大学河口海岸学博士生访学基金;; 国家自然科学基金(40671017);; 2008年河口海岸科学全国博士生学术论坛资助;; 教育部“创新团队”(PCSIRT0427);; 河口海岸学国家重点实验室开放基金(200507)的资助
【CateGory Index】: X55
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