DOI: 10.1007/s10533-015-0111-6
Scopus记录号: 2-s2.0-84938291612
论文题名: Dissimilatory nitrate reduction to ammonium (DNRA) seasonally dominates NO3 − reduction pathways in an anthropogenically impacted sub-tropical coastal lagoon
作者: Bernard R.J. ; Mortazavi B. ; Kleinhuizen A.A.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 125, 期: 1 起始页码: 47
结束页码: 64
语种: 英语
英文关键词: Anammox
; Denitrification
; DNRA
; Nitrogen cycling
; Sediment oxygen demand
Scopus关键词: ammonium
; anthropogenic effect
; benthic flux
; bioavailability
; coastal lagoon
; denitrification
; discharge
; ecosystem function
; ecosystem service
; estuarine sediment
; eutrophication
; groundwater pollution
; nitrate
; nitrogen cycle
; nitrogen fixation
; nitrous oxide
; nutrient availability
; nutrient dynamics
; oxygen
; reduction
; subtropical region
; sulfide
; underwater environment
; Alabama
; Little Lagoon
; United States
英文摘要: Sediments have an important role in nutrient dynamics by providing sites for denitrification, which, in conjunction with nitrogen (N) fixation and other processes such as dissimilatory nitrate reduction to ammonium (DNRA), can regulate ecosystem N availability. Little Lagoon, Alabama, USA, is affected by anthropogenic perturbations and has N inputs from nitrate (NO3 −)-contaminated submarine groundwater discharge. N cycle pathways (N-fixation, denitrification, anammox, and DNRA) and benthic fluxes were measured at three sites over a year to investigate the hypothesis that DNRA, by producing ammonium (NH4 +) as a dissimilatory end product of NO3 − reduction, was a significant process retaining bioavailable fixed N in Little Lagoon. DNRA was found to be an important NO3 − reduction pathway, especially in the summer months (study average: 52.1 μmol N m−2 h−1) compared to denitrification (study average 7.7 μmol N m−2 h−1). Sulfidic sediments during the majority of the year interfere with denitrification and result in decreased N loss through denitrification. The conversion of NO3 − to the more biologically preferred form of N, NH4 + via DNRA, means that NO3 − reduction has considerable nourishing potential and likely will affect both ecosystem function and services. These results indicate that NO3 − reduction may contribute to, rather than counteract, eutrophication during warm summers in estuaries receiving high N inputs. As estuarine sediments provide a key ecosystem function of N removal, excess anthropogenic N input jeopardizes their ability to effectively remove reactive N in Little Lagoon and likely in other impacted ecosystems. © 2015, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83490
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: The Dauphin Island Sea Lab, 101 Bienville Blvd., Dauphin Island, AL, United States; Department of Biological Sciences, The University of Alabama, Tuscaloosa, AL, United States
Recommended Citation:
Bernard R.J.,Mortazavi B.,Kleinhuizen A.A.. Dissimilatory nitrate reduction to ammonium (DNRA) seasonally dominates NO3 − reduction pathways in an anthropogenically impacted sub-tropical coastal lagoon[J]. Biogeochemistry,2015-01-01,125(1)