globalchange  > 气候减缓与适应
DOI: 10.1007/s10533-017-0311-3
Scopus记录号: 2-s2.0-85014256930
论文题名:
Seasonal benthic nitrogen cycling in a temperate shelf sea: the Celtic Sea
作者: Kitidis V.; Tait K.; Nunes J.; Brown I.; Woodward E.M.S.; Harris C.; Sabadel A.J.M.; Sivyer D.B.; Silburn B.; Kröger S.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 135, 期:2018-01-02
起始页码: 103
结束页码: 119
语种: 英语
英文关键词: Anammox ; Denitrification ; N-cycle ; Nitrification ; Sediment ; Shelf-seas
Scopus关键词: ammonium compound ; anoxic conditions ; cohesive sediment ; continental shelf ; denitrification ; inorganic nitrogen ; nitrification ; nitrogen cycle ; organic matter ; oxidation ; oxygen consumption ; phytoplankton ; porewater ; seafloor ; seasonal variation ; shelf sea ; water column ; Atlantic Ocean ; Celtic Sea
英文摘要: We undertook a seasonal study of benthic N-cycling on the Celtic Sea continental shelf in 2015, augmented by an earlier cruise in 2014. Two cruises in 2015 were centred before and after the Spring phytoplankton bloom and a further cruise was carried out in late summer. Five sites covering the mud to sand continuum were visited on all cruises, where we determined ammonium-oxidation, anammox and denitrification rates, expression of anammox and denitrification genes, N-nutrient fluxes and sediment porewater profiles of N-nutrients. Highest process rates were found during the post-bloom and late summer periods. The Celtic Sea was overwhelmingly a source of inorganic-N to the overlying water column. The efflux of nitrate was controlled by the magnitude of ammonium-oxidation. The latter accounted for 10–16% of total Oxygen consumption in cohesive sediments and 35–56% in sandy sediments. Ammonium oxidation rates in the range of 0.001–2.288 mmol m−2 days−1 were inversely correlated with sediment porosity and positively correlated with organic matter content (OM) which together explained 66% of the variance in rates. N-removal was dominated by anammox (0.003–0.636 mmol m−2 days−1), rather than denitrification (0.000–0.034 mmol m−2 days−1). This finding was supported by the corresponding gene expression data. The expression of hydrazine oxidoreductase (anammox) was significantly correlated with anammox and total N-removal rates. Anammox was positively correlated with porosity and OM, whilst denitrification was correlated with OM. The N-requirement of these processes was largely met through nitrification (ammonium-oxidation) rather than influx from the overlying water column. We estimated that N-removal via denitrification and anammox removed 6–9% of the organic-N deposited at the sea-floor from the overlying water column. The Celtic Sea system was thereby losing N which must be replenished on an annual basis in order to sustain productivity. © 2017, Springer International Publishing Switzerland.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83233
Appears in Collections:气候减缓与适应
气候变化事实与影响

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作者单位: Plymouth Marine Laboratory, Plymouth, United Kingdom; Department of Chemistry, University of Otago, Dunedin, New Zealand; Centre for Environment, Fisheries and Aquaculture Science (CEFAS), Lowestoft, United Kingdom

Recommended Citation:
Kitidis V.,Tait K.,Nunes J.,et al. Seasonal benthic nitrogen cycling in a temperate shelf sea: the Celtic Sea[J]. Biogeochemistry,2017-01-01,135(2018-01-02)
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