本研究测定了南海东北部和南部海域表层沉积物的生物硅含量(SIO2%),其含量范围分别为1.08%—3.01%和0.79%—9.06%,平均值分别为1.76%和4.22%。研究结果表明,南海表层沉积物中的生物硅含量与站位水深呈正相关关系;南海东北部的表层沉积物中的生物硅含量与其中的矿物含量、铁离子浓度、间隙水中的营养盐浓度不存在明显的相关性;南海南部海域表层沉积物中的生物硅含量与烧失量、有机碳含量、碳酸盐含量呈正相关关系,与粘土矿物含量相关性不明显。Biogenic silica(BSi) contents in surface sediments from the northeastern South China Sea(NSCS) and southern South China Sea(SSCS) were measured.The BSi contents(SiO2%)were in the range of 1.08%–3.01% and 0.79%–9.06%,with the means of 1.76% and 4.22% for the NSCS and SSCS,respectively.The results showed that the BSi contents in surface sediments have positive correlation with water depth of the sampling locations.The BSi contents in the NSCS had no evident correlation with minerals,ferrum ion concentrations in surface sediments or nutrients in the pore waters of sediments.The BSi contents in the SSCS had positive correlations with organic material and carbonate contents but not with clay material contents.国家基础研究发展计划项目(2005CB422305
