A preliminary study on the mixed model of SiO3-Si in surfacewater around the Changjiang River Estuary

DU Jin; SHI Xiao-yong; LI Hong-liang; LU Yong; CHEN Peng; ZHANG Chuan-song

doi:10.3969/j.issn.1001-909X.2014.01.012

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Journal of Marine Sciences ›› 2014, Vol. 32 ›› Issue (1) : 98-106. DOI: 10.3969/j.issn.1001-909X.2014.01.012

A preliminary study on the mixed model of SiO₃-Si in surfacewater around the Changjiang River Estuary

DU Jin¹, SHI Xiao-yong^1,2, LI Hong-liang^3,4, LU Yong^3,4, CHEN Peng⁵, ZHANG Chuan-song^*1

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Abstract

Based on the data obtained from the observation from July 2006 to December 2007, The SiO₃-Si dilution and its relationship with environmental factors in surface water around the Changjiang River Estuary were primarily analysed. Field investigation showed: (1)SiO₃-Si concentration in surface water around the Changjiang River Estuary had a good correlation with salinity in autumn and winter, which was mainly affected by physical mixed effect. There were some differences in spring and summer, which was mainly affected by biological effect, suspended particle matter and sediment. (2)In the surface water around the Changjiang River Estuary and adjacent area with salinity from 0 to 18, SiO₃-Si concentration slightly increased with temperature increasing, which was mainly affected by suspended particle matter and sediment. SiO₃-Si concentration basically unchanged with pH from 7.7 to 7.9, but decreased with pH from 7.9 to 8.2, which was mainly affected by physical mixed effect. SiO₃-Si concentration basically unchanged when DO changed. (3)In the surface water around the Changjiang River Estuary and adjacent area with salinity from 18 to 33, SiO₃-Si concentration was high in the Changjiang River Estuary and Hangzhou Bay, but was under 20 μmol/L in other area. Since the SiO₃-Si concentration was mainly affected by biological and physical mixed in spring and summer, physical mixed in autumn and winter, it decreased with pH from 7.9 to 8.3. Also the same reason, a negative correlation between SiO₃-Si concentration and DO in spring and summer while a positive correlation in autumn and winter were appeared.

Key words

SiO₃-Si / the Changjiang River Estuary / mixed model / salinity / dissolved oxygen

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DU Jin, SHI Xiao-yong, LI Hong-liang, LU Yong, CHEN Peng, ZHANG Chuan-song. A preliminary study on the mixed model of SiO₃-Si in surfacewater around the Changjiang River Estuary[J]. Journal of Marine Sciences. 2014, 32(1): 98-106 https://doi.org/10.3969/j.issn.1001-909X.2014.01.012

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