Journal
MARINE CHEMISTRY
Volume 192, Issue -, Pages 59-72Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.marchem.2017.04.001
Keywords
Phosphorus species; Diagenetic processes; Fe oxides; Phosphorus burial
Categories
Funding
- National Natural Science Foundation of China (NSFC) [41521064]
- National Research and Development program of China [2016YFA0600902]
- Qingdao National Laboratory for Marine Science and Technology [2015ASTP-OS08]
- Fundamental Research Funds for the Central Universities [201564008]
- Taishan Scholars Programme of Shandong Province
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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.
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