南大洋沉积物间隙水中营养盐分布及扩散通量研究

利用中国第18次南极考察获得的沉积物样品,对南大洋沉积物间隙水中营养盐的含量及分布特征进行了研究,估算了营养盐的底部通量.结果表明,南大洋沉积物间隙水中的营养盐以高含量的硅酸盐、铵盐为主.在垂向分布上,硅酸盐在沉积物-水界面呈现出明显的浓度梯度,这种分布特征表明,在硅的早期成岩过程中溶出是主要过程.沉积物中有机物的降解反应主要在还原状态下进行.硅酸盐与铵盐存在明显的向上释放的通量.

Study on distribution and benthic fluxesof nutrients in sediment interstitial water of the Southern Ocean

During the cruise of CHINARE-18, the concentration and profile characteristics of nutrients in the sediment interstitial water from the Southern Ocean were determined. The results show that the concentration of SiO3--Si and NH4--N are much higher than other nutrients. The profile of SiO3--Si was characterized by sharp gradients near the sediment--water interface, profile distribution of silicate show that during the diagenetic reaction of silicate, dissolution is the main part. The organic matter decomposition was occurred under the anaerobic condition. Benthic fluxes of SiO3 Si, NH4--N were from interstitial water to overlying water, and regeneration of silicate and ammonium was the main part of the nutrient regeneration in sediment interstitial water of the study area.