南大洋普里兹湾沉积物中生物硅含量与分布

Biogenic silica in surficial sediments of Prydz Bay of the Southern Ocean

利用中国第18,21次南极考察获得的沉积物样品,对南大洋普里兹湾沉积物中生物硅（BSiO2）的含量以及分布特征进行了初步研究.结果表明：普里兹湾表层沉积物中生物硅含量丰富,生物硅含量在4.89%-85.41%之间变化,平均为30.90%.最高值出现在湾内的IV-10站.生物硅的垂向分布与间隙水中硅酸盐呈现相反的变化趋势.表层沉积物中生物硅和有机碳分布趋势与表层海水中叶绿素a、初级生产力的分布趋势密切相关,最大值均出现在普里兹湾环流中心区域,较好地反映了上层水体中初级生产力的变化状况.

The content and distribution of biogenic silica were investigated in sediment cores from the Southern Ocean（Prydz Bay） during the CHINARE-18/21 cruise.The results show that the content of biogenic silica is ranged from 4.89% to 85.41%,and the average content of biogenic silica is 30.90%,the highest value occurs at the IV-10 station.The profile of BSiO2 is contrast to the profile of SiLicate in the interstitial water.The contents of biogenic silica and organic carbon in the surface sediments in the central area of Prydz Bay gyre were much higher than those in other area,and closely related to the Chl a content and primary productivity of phytoplankton in the surface water column.