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| Citation: | Li Huiju, Liu Shumin, Jian Huimin, Chen Hongtao, Yao Qingzhen. The study of silica in sediment and pore water in the adjacent area of Changjiang Estuary[J]. Haiyang Xuebao, 2017, 39(4): 39-49. doi: 10.3969/j.issn.0253-4193.2017.04.004
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Sediment samples and pore water were collected in the adjacent area of Changjiang Estuary in June and August of 2011. The study discussed the distribution characteristics and influencing factors of biogenic silica (BSi) in the sediments and the dissolved silicate (DSi) in the pore water, and the cycle and conservation of biological silicon. The results showed that the content of BSi in the surface sediment was less than 1%. The range of concentration of BSi in core sediments was 0.34%-0.52%. The distribution of BSi in C3 and D1 core sediments was controlled by early diagenesis. That of 33# core sediment was mainly caused by the changes of hydrodynamic condition. The range of concentration of DSi in pore water was 101.6-263.9 μmol/L, which was lower than the solubility of silica. The higher pH in pore water, lower moisture content and higher reduction of sediments lead the higher concentration of DSi in pore water. The higher silica burial efficiency in these stations showed that the adjacent area of Changjiang Estuary was the potential sink of silica. The distribution of silica sedimentation flux was in a decreasing trend from coastal water to the open sea, which was similar to the distribution of silica deposition rate and silica burial efficiency.
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