DOI: 10.1002/2014GB005052
Scopus记录号: 2-s2.0-84946544431
论文题名: Intense nitrogen cycling in permeable intertidal sediment revealed by a nitrous oxide hot spot
作者: Schutte C ; A ; , Joye S ; B ; , Wilson A ; M ; , Evans T ; , Moore W ; S ; , Casciotti K
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2015
卷: 29, 期: 10 起始页码: 1584
结束页码: 1598
语种: 英语
英文关键词: groundwater hydrology
; nitrogen cycling
; oxidation/reduction reactions
; trace gases
Scopus关键词: anthropogenic effect
; coastal sediment
; concentration (composition)
; denitrification
; eutrophication
; intertidal environment
; nitrogen cycle
; nitrous oxide
; oxidation
; permeability
; reduction
; trace gas
英文摘要: Approximately 40% of the total global rate of nitrogen fixation is the result of human activities, and most of this anthropogenic nitrogen is used to fertilize agricultural fields. Approximately 23% of the applied agricultural nitrogen is delivered to the coastal zone, often reducing water quality and driving eutrophication. Nitrogen cycling in coastal sediments can mitigate eutrophication by removing bioavailable nitrogen. However, some of these processes generate nitrous oxide, a potent greenhouse gas, as a by-product. Here we report the discovery of a nitrous oxide production hot spot in shallow barrier island sands. Nitrous oxide concentrations, production and consumption rates, vertical diffusion fluxes, and flux to the atmosphere were measured across triplicate depth profiles. Using a mass balance approach, rates of net nitrous oxide production were estimated to be 40 μmol m-2 d-1. This production was driven by a hot spot of nitrate consumption that removed bioavailable nitrogen from the coastal environment at a rate of 10 mmol m-2 d-1, a rate that is comparable with the highest rates of denitrification reported for coastal sediments. ©2015. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77926
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Marine Sciences, University of Georgia, Athens, GA, United States; Department of Earth and Ocean Sciences, University of South Carolina, Columbia, SC, United States; Department of Environmental Earth System Science, Stanford University, Stanford, CA, United States
Recommended Citation:
Schutte C,A,, Joye S,et al. Intense nitrogen cycling in permeable intertidal sediment revealed by a nitrous oxide hot spot[J]. Global Biogeochemical Cycles,2015-01-01,29(10)