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N2 production through denitrification and anammox across the continental margin (shelf–slope–rise) of the Ulleung Basin, East Sea

Title
N2 production through denitrification and anammox across the continental margin (shelf–slope–rise) of the Ulleung Basin, East Sea
Author
현정호
Keywords
ANAEROBIC AMMONIUM OXIDATION; ORGANIC-CARBON OXIDATION; INTACT SEDIMENT CORES; OXYGEN MINIMUM ZONE; MARINE-SEDIMENTS; SULFATE REDUCTION; EAST/JAPAN SEA; BENTHIC DENITRIFICATION; ESTUARINE SEDIMENT; SURFACE SEDIMENTS
Issue Date
2018-03
Publisher
WILEY
Citation
LIMNOLOGY AND OCEANOGRAPHY, v. 63, No. S1, Page. 410-424
Abstract
Experimental determinations of nitrogen cycling in deep-sea sediments are strongly underrepresented in the databases. To investigate the total N2 production rates and relative contribution of denitrification and anaerobic ammonium oxidation (anammox) to benthic fixed-N removal processes, we conducted 15N isotope-labeling incubation experiments in whole cores and slurries at nine stations across the continental margin from the shelf (˂ 200 m) and into the deep (˃ 2000 m) Ulleung Basin (UB) in the East Sea. The total N2 production rates (anammox plus denitrification) in the center of the UB (8.4 ± 0.2 μmol N m−2 h−1) were high compared to most other deep-sea sediments at similar water depths. Denitrification rates decreased from the shelf (7.6 ± 0.6 μmol N m−2 h−1) to the basin (3.2 ± 0.4 μmol N m−2 h−1), in proportion to benthic oxygen consumption, whereas anammox rates remained relatively constant or even increased slightly (1.3–4.1 μmol N m−2 h−1). The contribution of anammox to the total N2 production (ra) increased with increasing water depth from the shelf (ca. 17%) to the basin (ca. 56%). The enhanced ra in the center of the UB was associated with an increased availability of nitrite for anammox, which was likely a result of the competitive suppression of denitrification by manganese reduction under MnO2-rich conditions. Our results emphasize the importance of anammox as a sink for reactive nitrogen in deep-sea sediments and contribute toward a mechanistic understanding of the factors controlling benthic reactive nitrogen loss in the ocean.
URI
https://aslopubs.onlinelibrary.wiley.com/doi/full/10.1002/lno.10750http://repository.hanyang.ac.kr/handle/20.500.11754/105419
ISSN
0024-3590
DOI
10.1002/lno.10750
Appears in Collections:
COLLEGE OF SCIENCE AND CONVERGENCE TECHNOLOGY[E](과학기술융합대학) > MARINE SCIENCE AND CONVERGENCE ENGINEERING(해양융합공학과) > Articles
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