长江口邻近海域沉积物和间隙水中硅的研究

发布时间：2018-12-06 16:27

【摘要】：以2011年6月和8月在长江口邻近海域采集的沉积物和间隙水样品为研究对象,讨论了沉积物中生物硅(BSi)和间隙水中溶解硅(DSi)的分布情况和影响因素,并初步探讨了生物硅的循环和保存。结果表明,表层沉积物中BSi的含量较低,且均小于1%。柱状沉积物中BSi的含量范围为0.34%~0.52%。C3、D1站位柱状沉积物中BSi的记录主要是由早期成岩过程控制,33#站位的分布特征主要是由水动力等变化控制。沉积物间隙水中DSi的浓度范围为101.6~263.9μmol/L,低于纯BSi的溶解度;间隙水的pH值越大,沉积物的含水率越低,还原性越强,间隙水中DSi的含量越高。3站位生物硅的埋藏效率均较高,表明长江口邻近海域是潜在的硅的汇。沉积通量的分布与沉积速率和埋藏效率的分布一致,均有近岸高于远海的趋势。
[Abstract]:The distribution of biogenic silicon (BSi) and dissolved silicon (DSi) in sediment and dissolved silicon (DSi) in interstitial water were studied in June and August 2011 in the adjacent waters of the Changjiang Estuary, and the distribution of biogenic silicon (BSi) and dissolved silicon (DSi) in interstitial water were discussed. The cycling and preservation of biological silicon were also discussed. The results showed that the content of BSi in the surface sediments was lower than that in the surface sediments. The content of BSi in columnar sediments ranges from 0.34 to 0.52. The recording of BSi in columnar sediments is mainly controlled by the early diagenesis process, and the distribution of BSi in the 32# stations is mainly controlled by hydrodynamic changes. The concentration range of DSi in sediment interstitial water is 101.6 渭 mol/L, and 263.9 渭 mol/L, which is lower than that of pure BSi. The higher the pH value of the interstitial water, the lower the water content of sediment, the stronger the reduction, and the higher the content of DSi in the interstitial water. 3. The burial efficiency of biogenic silicon at station 3 is higher, which indicates that the adjacent sea area of the Changjiang Estuary is a potential sink of silicon. The distribution of sediment flux is consistent with the distribution of deposition rate and burial efficiency.
【作者单位】：中国海洋大学海洋化学理论与工程技术教育部重点实验室;中国海洋大学化学化工学院;
【基金】：国家自然科学基金(41276070) 鳌山科技创新计划项目(2016ASKJ02)
【分类号】：P736.21

【相似文献】