DOI: 10.1038/ngeo2684
论文题名: Importance and controls of anaerobic ammonium oxidation influenced by riverbed geology
作者: Lansdown K. ; McKew B.A. ; Whitby C. ; Heppell C.M. ; Dumbrell A.J. ; Binley A. ; Olde L. ; Trimmer M.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2016
卷: 9, 期: 5 起始页码: 357
结束页码: 360
语种: 英语
Scopus关键词: ammonium
; anoxic conditions
; denitrification
; enzyme activity
; fluvial deposit
; fluvial geomorphology
; gene expression
; microbial community
; molecular analysis
; nitrogen cycle
; nitrogen isotope
; oxidation
; river bed
; runoff
; tracer
; Avon Basin
; England
; Hampshire
; United Kingdom
英文摘要: Rivers are an important global sink for excess bioavailable nitrogen: they convert approximately 40% of terrestrial N runoff per year (∼47 Tg) to biologically unavailable N 2 gas and return it to the atmosphere. At present, riverine N 2 production is conceptualized and modelled as denitrification. Anaerobic ammonium oxidation, known as anammox, is an alternative pathway of N 2 production important in marine environments, but its contribution to riverine N 2 production is not well understood. Here we use in situ and laboratory measurements of anammox activity using 15 N tracers and molecular analyses of microbial communities to evaluate anammox in clay-, sand-and chalk-dominated river beds in the Hampshire Avon catchment, UK during summer 2013. Abundance of the hzo gene, which encodes an enzyme central to anammox metabolism, varied across the contrasting geologies. Anammox rates were similar across geologies but contributed different proportions of N 2 production because of variation in denitrification rates. In spite of requiring anoxic conditions, anammox, most likely coupled to partial nitrification, contributed up to 58% of in situ N 2 production in oxic, permeable riverbeds. In contrast, denitrification dominated in low-permeability clay-bed rivers, where anammox contributes roughly 7% to the production of N 2 gas. We conclude that anammox can represent an important nitrogen loss pathway in permeable river sediments. © 2016 Macmillan Publishers Limited. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106016
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: School of Biological and Chemical Sciences, Queen Mary University of London, Mile End Road, London, United Kingdom; School of Geography, Queen Mary University of London, Mile End Road, London, United Kingdom; School of Biological Sciences, University of Essex, Wivenhoe Park, Colchester, United Kingdom; Lancaster Environment Centre, Lancaster University, Lancaster, United Kingdom
Recommended Citation:
Lansdown K.,McKew B.A.,Whitby C.,et al. Importance and controls of anaerobic ammonium oxidation influenced by riverbed geology[J]. Nature Geoscience,2016-01-01,9(5)