鸭绿江口潮滩沉积物间隙水中的营养盐

通过对鸭绿江口潮滩区2个采样点采集的柱状样分析、培养实验,测定了沉积物间隙水中的营养盐和沉积物中的S^2-结果表明,鸭绿江口潮滩区沉积物间隙水中的NO₃^-含量平均值为3.0μmol/L,垂直分布变化不大.PO₄^3-和SiO₃^2-的含量范围分别为0.8～70.4μmol/L,111.6～1054.3μmol/L,且两者垂直变化类似,随沉积物深度的增加先增加后下降.沉积物中硫化物的分布是随深度增加,含量升高.鸭绿江口潮滩区沉积物Eh、pH的测定结果显示,在13cm以下,Eh降为负值,沉积物还原性逐渐增强.而pH自上而下变化不大.由分子扩散公式计算结果表明,鸭绿江口潮滩区营养盐均由沉积物向上覆水扩散.

Nutrients in Sediment Pore Water in Tidal Flat Area in Yalujiang Estuary

The concentrations of NO3-, PO(4)3- and SiO(3)2- in sediment pore waters from tidal flat area in Yalujiang Estuary were determined. The concentration of NO3- in sediment pore waters was almost stable, the average NO3- was 3.0 mumol/L. The concentration of PO(4)3- and SiO(3)2- were 0.8-70.4 mumol/L and 111.6-1054.3 mumol/L, respectively. The depth distribution of PO(4)3- and SiO(3)2- increased with depth at first and then decreased further down. The content of S2- in sediment raise with depth. Under the depth of 13 cm, Eh decreased into minus. pH did not obviously change with depth. The diffusion of nutrients in tidal flat area in Yalujiang estuary was from pore water into overlying water.