Sediment cores were collected at three stations in the tidal flat of Daguhe Estuary in February, May, August and November, 2009. The vertical distributions of PO4-P and NH4-N in porewater were analyzed, and the PO4-P and NH4-N fluxes at the sediment-water interface were calculated with intact sediment core's incubation method. The results indicate that the variation ranges of PO4-P and NH4-N concentrations in the porewater are 0~0. 049 mmol/L and 0 - 0. 050 mmol/L, respectively. The PO4-P concentration in the porewater is high at the eastern tidal flat in winter and at the river mouth in spring, and the NH4-N concentration is high at the river mouth in spring and at the western tidal flat in autumn. The PO4-P and NH4-N concentrations show significant vertical fluctuation, but they exhibited no regular distribution patterns. The annual variation ranges of PO4-P and NH3-N fluxes were - 0. 13 - 0. 26 mmol/ (m2 ? d) and -0. 90~0. 15 mmol/(m2 ? d), respectively. In addition, the PO4-P and NH4-N fluxes at the sediment-water interface are very low in summer.%2009年2,5,8和11月在胶州湾大沽河口潮滩3个站位采集沉积物柱状样,分析了间隙水PO4-P,NH4-N的垂直分布,并用原柱样静态实验测定了沉积物-水界面PO4-p,NH4-N的交换通量.结果表明,间隙水中PO4-P和NH4-N浓度变化范围相当,分别为0～0.049 mmol/L和0～0.050 mmol/L.间隙水中PO4 -P浓度在冬季东潮滩和春季河口区较高;间隙水NH4-N浓度在春季河口区和秋季西潮滩较高.间隙水中PO4 -P和NH4-N浓度在垂直方向上波动较大,随深度增大无确定变化趋势.沉积物-水界面PO4-P和NH4-N的交换通量的变化范围分别为--0.13～0.26 mmol/(m2·d)和-0.90～0.15 mmol/(m2·d).另外,沉积物-水界面的PO4 -P和NH4-N交换通量在夏季很低.
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