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Phosphorus speciation and distribution in surface sediments of the Yellow Sea and East China Sea and potential impacts on ecosystem

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Abstract

For better understanding the phosphorus (P) cycle and its impacts on one of the most important fishing grounds and pressures on the marine ecosystem in the Yellow Sea (YS) and East China Sea (ECS), it is essential to distinguish the contents of different P speciation in sediments and have the knowledge of its distribution and bioavailability. In this study, the modified SEDEX procedure was employed to quantify the different forms of P in sediments. The contents of phosphorus fractions in surface sediments were 0.20–0.89 μmol/g for exchangeable-P (Exch-P), 0.37–2.86 μmol/g for Fe-bound P (Fe-P), 0.61–3.07 μmol/g for authigenic Ca-P (ACa-P), 6.39–13.73 μmol/g for detrital-P (DAP) and 0.54–10.06 μmol/g for organic P (OP). The distribution of Exch-P, Fe-P and OP seemed to be similar. The concentrations of Exch-P, Fe-P and OP were slightly higher in the Yellow Sea than that in the East China Sea, and low concentrations could be observed in the middle part of the ECS and southwest off Cheju Island. The distribution of ACa-P was different from those of Exch-P, Fe-P and OP. DAP was the major fraction of sedimentary P in the research region. The sum of Exch-P, Fe-P and OP may be thought to be potentially bioavailable P in the research region. The percentage of bioavailable P in TP ranged from 13% to 61%. Bioavailable P burial flux that appeared regional differences was affected by sedimentation rates, porosity and bioavailable P content, and the distribution of bioavailable P burial flux were almost the same as that of TP burial flux.

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  1. Key Laboratory of Marine Chemistry Theory and Technology of Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao, 266100, China

    Guodong Song & Sumei Liu

  2. Qingdao Collaborative Innovation Center of Marine Science and Technology, Qingdao, 266100, China

    Sumei Liu

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  1. Guodong Song
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Foundation item: The National Key Basic Research Program from the Ministry of Science and Technology of China under contract Nos 2011CB409802 and 2010CB428900; the Program of International Science & Technology Cooperation under contract No. 2010DFA24590.

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Song, G., Liu, S. Phosphorus speciation and distribution in surface sediments of the Yellow Sea and East China Sea and potential impacts on ecosystem. Acta Oceanol. Sin. 34, 84–91 (2015). https://doi.org/10.1007/s13131-015-0653-4

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