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2012年4月对珠江口磨刀门断面8个站位进行了表层沉积物间隙水和上覆水的采样分析,估算了沉积物-水界面的无机营养盐交换通量。调查发现,磨刀门水域表层沉积物间隙水和上覆水营养盐含量有着明显的差异。在河口下游,NO3-N在间隙水和上覆水中均呈现出显著增加趋势,其他各形态无机营养盐则呈现出上覆水中营养盐降低,间隙水中营养盐增加的趋势。计算表明:观测断面沿途各站表层沉积物间隙水与上覆水之间SiO3-Si、PO4-P、NH4-N、NO2-N、NO3-N的平均交换通量分别为40.94、1.37、163.63、-7.30、-33.43μmol/(m2·d),沿河口方向营养盐的交换方向也发生变化。进一步的相关性分析表明,上覆水中营养盐浓度不是决定营养盐交换通量的直接因素,还受DO、pH、Eh、水动力条件等因素共同影响。
In April 2012, samples of surface sediment interstitial water and overlying water were sampled from 8 stations of the Modaomen section of the Pearl River estuary, and the inorganic nutrient exchange flux was estimated at the sediment-water interface. The survey found that there was a significant difference in the nutrient contents of interstitial water and overlying water in the surface sediment of Shaodongmen waters. In the downstream of the estuary, NO3-N showed a significant increase trend in both interstitial water and overlying water, while other forms of inorganic nutrients showed a decrease of nutrients in overlying water and an increase of nutrients in interstitial water. The calculated results show that the average exchange fluxes of SiO3-Si, PO4-P, NH4-N, NO2-N and NO3-N between surface sediment interstitial water and overlying water at stations along the observation section are 40.94, 1.37 and 163.63, -7.30, -33.43μmol / (m2 · d) respectively. The direction of nutrient exchange along the estuary also changed. Further correlation analysis showed that nutrient concentration in overlying water was not a direct factor determining nutrient exchange flux, but also affected by factors such as DO, pH, Eh and hydrodynamic conditions.