• 中文核心期刊
  • 中国科技核心期刊
  • ISSN 1007-6336
  • CN 21-1168/X
Volume 36 Issue 3
Sep.  2017
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SUN Huan, ZHANG Qiu-feng, TU Jian-bo, MA Yu-yan, YIN Cui-ling, WANG Bin. Distribution and influencing factors of COD, along with the relationship with eutrophication in Tianjin coastal area[J]. Chinese Journal of MARINE ENVIRONMENTAL SCIENCE, 2017, 36(3): 343-348, 371. DOI: 10.13634/j.cnki.mes20170304
Citation: SUN Huan, ZHANG Qiu-feng, TU Jian-bo, MA Yu-yan, YIN Cui-ling, WANG Bin. Distribution and influencing factors of COD, along with the relationship with eutrophication in Tianjin coastal area[J]. Chinese Journal of MARINE ENVIRONMENTAL SCIENCE, 2017, 36(3): 343-348, 371. DOI: 10.13634/j.cnki.mes20170304
shu

Distribution and influencing factors of COD, along with the relationship with eutrophication in Tianjin coastal area

  • 1.

    College Of Marine Science, Shanghai Ocean University, Shanghai 201306, China

  • 2.

    Tianjin Marine Environmental Monitoring Central Station, SOA, Tianjin 300457, China

  • 3.

    Tianjin Marine Environmental Monitoring and Forecast Center, Tianjin 300457, China

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  • Received Date: June 10, 2016
  • Revised Date: September 11, 2016
    Graphical Abstract
    • Abstract

  • The spatiotemporal variation of chemical oxygen demand (COD) and the eutrophication status were determined in spring(May), summer(August)and autumn(October) 2014, in Tianjin coastal area, Bohai Bay. Based on the seawater quality monitoring database at 18 stations in this area, the relationship between COD and nutrient quality index (NQI) were investigated, as well as the variations of COD during the occurrence of a red tide. Significant seasonal variation of COD was found, with that higher in summer and lower in spring and autumn. COD decreased from nearshore to offshore and from south to north. NQI index ranged from 1.68 to 12.50, with the average of 4.46, reflecting serious eutrophication. To some extent, the significant positive correlation between COD and NQI index could reflect the eutrophication status in seawater. Significantly and positively, COD was correlated with red tide biological density and Chl a, which plays an important role in reflecting the red tide generating and vanishing process.

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