黄、东海柱状沉积物中生物硅含量的分析

The Analysis of Biogenic Silica in the Sediments of the East China Sea and the Yellow Sea

对东、黄海2 0 0 0年10月和2 0 0 1年5月2个航次所获得的表层及柱状沉积物样品进行分析,在单点提取测定方法的基础上采用连续提取方法,利用斜率校正法扣除非生物硅的干扰,测定了东、黄海柱状沉积物中生物硅的含量。从整个东、黄海海域来看,沉积物中生物硅的含量<1% ,属于低含量海域;讨论了沉积物样品处理方法对分析结果的影响,在此基础上分析了不同海区柱状沉积物中生物硅的分布特征以及沉积物中叶绿素、水体中硅酸盐、叶绿素、N/P比值等生态要素与沉积物中生物硅分布的相关关系。

The investigations were carried out in Oct.2000 and May 2001 in the Yellow Sea and East China Sea. The biogenic silica contents were measured in the core sediments of the study areas. Some influential factors for BSi measurements (such as solid-solution ratio and sediment pretreatment methods) were also studied. The results indicate that: 1) There is no distinct difference between the freezed-dried and oven-dried pretreatment methods. 2) The BSi content is less than one percent in the research areas. The BSi contents decreases with depth in the core sediments. The seasonal variation of BSi contents is not great in the study areas.3) The distribution of BSi in the sediment is similar to that of chl-a, nutritions and silicate in the water or sediments.