【摘要】 通过对1998年5月、2000年10月及2001年5月东、黄海海区3个航次采集的沉积物样品中生物硅(BSi)含量的分析,讨论了东海西北部、南黄海沉积物中BSi的分布、埋藏及其与水体初级生产力、硅藻丰度的关系.测定表明,调查海区表层沉积物中BSi的含量介于0.21%~0.70%,海区BSi的分布与水体初级生产力的变化一致.在长江口海区,BSi的积累与河口区水体中的叶绿素a、初级生产力有着密切的关系,近20年来长江口海区沉积物中BSi含量的变化记录了长江径流以及长江输送N、P、Si营养盐通量的年际变化.更多还原

【Abstract】 The distribution of biogenic silica burying and their relation with the primary productivity of waters and the silica abundance, in the sediments of the northwest of East China Sea and the southern Yellow Sea was discussed through analysis of biogenic silica content of the sediment samples collected 3 voyages in the Yellow Sea area in May 1998, October 2000 and May 2001. The distribution of BSi in the sea area and the primary productivity of waters had identical change. In the Yangtzi River estuary sea area, the accumulation of BSi had close relation with Chl-a and the primary productivity of waters and the change of the BSi content in the sea area sediments recorded the analog changes of the nutrients flux of N, P, Si transported by the Yangtzi River and its runoff in the last 20 years.更多还原