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

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

DU Jin1, SHI Xiao-yong1,2, LI Hong-liang3,4, LU Yong3,4, CHEN Peng5, ZHANG Chuan-song*1   

  1. 1. College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China;
    2. National Marine Hazard Mitigation Service, SOA, Beijing 100194, China;
    3. Laboratory of Marine Ecosystem and Biogeochemistry, SOA, Hangzhou 310012, China;
    4. The Second Institute of Oceanography, SOA, Hangzhou 310012, China;
    5. Hermann Gmeiner School, YanTai 265500, China
  • Received:2013-07-14 Revised:2013-10-20 Online:2014-03-15 Published:2022-11-25

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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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