Distribution of nutrients and eutrophication assessment in the Bohai Sea of China |
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Authors: | WANG Xiulin CUI Zhengguo GUO Quan HAN Xiurong WANG Jiangtao Key Laboratory of Marine Chemistry Theory Technology Ministry of Education Ocean University of China Qingdao China Marine Pollution Eco-Chemistry Laboratory College of Chemistry Chemical Engineering China Qingdao Textile Fiber Inspection Institute Qingdao China |
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Institution: | [1]Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China [2]Marine Pollution Eco-Chemistry Laboratory, College of Chemistry and Che.mical Engineering, Ocean University of China, Qingdao 266100, China [3]Qingdao Textile Fiber Inspection Institute, Qingdao 266071, China |
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Abstract: | Water samples were collected in 120 stations in the Bohai Sea of China to analyze the distribution of dissolved nutrients and assess the degree of eutrophication in August 2002. The result shows that the average concentration of DIN increased and the PO4-P concentration sharply decreased compared to the previous data of corresponding period. The high concentrations of DIN and PO4-P occurred in coastal waters, especially in the bays and some river estuaries, while the high concentrations of SiO3-Si in the surface and middle depth occurred in the central area of the Bohai Sea. The average ratio of DIN/ PO4-P was much higher than the Redfield Ratio (16:1). Apparently, PO4-P was one of the limiting nutrient for phytoplankton growing in the sea. The average concentrations of DON and DOP were higher than their inorganic forms. The results of eutrophication assessment show that 22.1% of all stations were classified as violating the concentration levels of the National Seawater Quality Standard (GB 3097-1997) for DIN and only 3.9% for PO4-P. The average eutrophication index in the overall area was 0.21±0.22 and the high values occurred in Bohai Bay, Liaodong Bay and near the Yellow River estuary. This means that the state of eutrophication was generally mesotrophic in the Bohai Sea, but relatively worse in the bays, especially some river estuaries. |
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Keywords: | eutrophication aassessment nutrients distribution Bohai Sea |
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