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Phosphorus recycling and burial in core sediments of the East China Sea

机译：东海核心沉积物中磷的循环利用与埋葬

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摘要

Phosphorus (P) recycling and burial in the sediment of the East China Sea (ECS) were investigated in October 2012. Dissolved Fe2+, Mn2+, PO43- and NH4+ in pore water and P species by sequential extraction as well as Fe oxides in core sediments were measured. The total P (P-Total) concentrations in core sediments ranged from 11.93 to 23.87 mu mol g(-1) and showed a decreasing trend from inshore to offshore on the ECS shelf. Detrital P (P-Detrital) was the main chemical form of P in core sediments, which accounted for 43-67% of P-Total. We found that the molar ratios of organic carbon (OC) to organic P (OC/P-Organic) were > 106 in all cores except for the inner shelf site DH3-1, as well as the middle shelf sites DH4-3 and DH3-8. The OC/P-reactive ratios (11-90) in all cores were much lower than the Redfield ratio, indicating the presence of excess P-reactive relative to OC in sediments of the ECS. The concentrations of P-CDB were well correlated with the Fecoa concentrations in the core sediments. The diffusive flux of PO43- across the sediment-water interface was estimated to be 0.12-1.42 mu mol cm(-2) yr(-1). The P-Total accumulation rates ranged from 6.1 to 20.7 mu mol cm(-2) yr(-1) and decreased with the distance from the coast. The P burial efficiency (PBE) was 93-99% of the sediment P-Total on the ECS shelf, which was comparable to the worldwide continental margin of the sediment, and most of the burial of P occurred as P-Detrital and authigenic P (P-CFA). The potential bioavailable P in the core sediments was estimated to be 6-20% of P-Total.
机译：2012年10月，对东海沉积物中磷（P）的循环利用和埋葬进行了研究。通过顺序萃取，在孔隙水和P物种中溶解了Fe2 +，Mn2 +，PO43-和NH4 +以及核心沉积物中的Fe氧化物被测量。核心沉积物中的总P（P-总）浓度范围为11.93至23.87μmolg（-1），并且在ECS架子上从近海到近海呈下降趋势。碎屑P（P-Detrital）是核心沉积物中P的主要化学形式，占P-Total的43-67％。我们发现，除了内架位DH3-1，中架位DH4-3和DH3以外，所有核心中有机碳（OC）与有机P的摩尔比（OC / P-有机物）> 106 -8。所有岩心中的OC / P反应比（11-90）远低于Redfield比，表明ECS沉积物中相对于OC的过量P反应性存在。 P-CDB的浓度与核心沉积物中的Fecoa浓度相关性很好。穿过沉积物-水界面的PO43-的扩散通量估计为0.12-1.42μmol cm（-2）yr（-1）。 P总积累率范围从6.1到20.7μmol cm（-2）yr（-1），并且随着距海岸的距离而降低。 P埋藏效率（PBE）为ECS架子上沉积物P-总含量的93-99％，与全球沉积物的大陆边缘相当，并且P的大部分埋藏为P-碎屑和自生P （P-CFA）。估计核心沉积物中潜在的生物利用磷为磷总量的6-20％。

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  • 来源
    《Marine Chemistry》 |2017年第may20期|59-72|共14页
  • 作者

    Yang Bin; Song Guo-Dong; Liu Su-Mei; Jin Jie;

  • 作者单位

    Ocean Univ China, Lab Marine Ecol & Environm Sci, Qingdao Natl Lab Marine Sci & Technol, Key Lab Marine Chem Theory & Technol,Minist Educ, Qingdao 266100, Peoples R China|Qinzhou Univ, Guangxi Key Lab Marine Disaster Beibu Gulf, Qinzhou 535011, Peoples R China;

    Ocean Univ China, Lab Marine Ecol & Environm Sci, Qingdao Natl Lab Marine Sci & Technol, Key Lab Marine Chem Theory & Technol,Minist Educ, Qingdao 266100, Peoples R China;

    Ocean Univ China, Lab Marine Ecol & Environm Sci, Qingdao Natl Lab Marine Sci & Technol, Key Lab Marine Chem Theory & Technol,Minist Educ, Qingdao 266100, Peoples R China;

    East China Normal Univ, State Key Lab Estuarine & Coastal Res, Shanghai 200062, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Phosphorus species; Diagenetic processes; Fe oxides; Phosphorus burial;

    机译：磷种类;成岩过程;Fe氧化物;磷埋藏;

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