Distribution characteristics and environmental significance of different silicon forms in surface sediments of Shanmei Reservoir

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作者：

Department of Environmental Science and Engineering, Chemical Engineering Institute of Huaqiao University, Xiamen ^{[1
]}

361021, China

不详 ^{[2
]}

361021, China

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来源：

Zhongguo Huanjing Kexue | / 1卷 / 211-217期

关键词：

Deepwater reservoirs - Distribution characteristics - Environmental factors - Environmental significance - Sequential extraction method - Spatiotemporal distributions - Surface sediments - Temporal and spatial distribution;

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摘要：

Tessie's sequential extraction method was used to analyze different forms of silicon (IEF-Si, CF-Si, IMOF-Si and OSF-Si) in surface sediments from a subtropical mountain deepwater reservoir-Shame Reservoir in Quanzhou City, and their temporal and spatial distribution were investigated. Total concentrations of silicon in surface sediments ranged in 3043.50~4414.24, 2711.17~3676.89, 3198.44~4444.28 mg/kg in normal water period, dry season and wet season, respectively. Total concentrations of silicon in surface sediments of this reservoir from high to low was as follows: tail zone of reservoir, central zone of reservoir, near-dam zone, storage zone. IEF-Si and CF-Si accounted for a small proportion of total silicon, but they were active species. Although IEF-Si content was low, its potential release was likely to impact the trophic state of aquatic ecosystem and the primary production. CF-Si was sensitive to environmental factors, especially pH. The percentages of IMOF-Si and OSF-Si were much larger than those of other two forms. Mobility of IMOF-Si was probably the main way to supply Si in the Shanmei Reservoir. OSF-Si was relatively stable and its distribution was linked with the sediment type and environmental. The concentrations of CF-Si and IMOF-Si were positively correlated during normal water period (P ©, 2015, Chinese Society for Environmental Sciences. All right reserved.

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