DOI: 10.1007/s10533-014-0019-6
Scopus记录号: 2-s2.0-84918813528
论文题名: N2-fixation by methanotrophs sustains carbon and nitrogen accumulation in pristine peatlands
作者: Vile M.A. ; Kelman Wieder R. ; Živković T. ; Scott K.D. ; Vitt D.H. ; Hartsock J.A. ; Iosue C.L. ; Quinn J.C. ; Petix M. ; Fillingim H.M. ; Popma J.M.A. ; Dynarski K.A. ; Jackman T.R. ; Albright C.M. ; Wykoff D.D.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 121, 期: 2 起始页码: 317
结束页码: 328
语种: 英语
英文关键词: Biological N2-fixation
; Boreal peatlands
; Carbon
; Methanotrophs
; Nitrogen
; Sphagnum
Scopus关键词: Bryophyta
; Cyanobacteria
; Prokaryota
; Sphagnum
英文摘要: Symbiotic relationships between N2-fixing prokaryotes and their autotrophic hosts are essential in nitrogen (N)-limited ecosystems, yet the importance of this association in pristine boreal peatlands, which store 25 % of the world’s soil (C), has been overlooked. External inputs of N to bogs are predominantly atmospheric, and given that regions of boreal Canada anchor some of the lowest rates found globally (~1 kg N ha−1 year−1), biomass production is thought to be limited primarily by N. Despite historically low N deposition, we show that boreal bogs have accumulated approximately 12–25 times more N than can be explained by atmospheric inputs. Here we demonstrate high rates of biological N2-fixation in prokaryotes associated with Sphagnum mosses that can fully account for the missing input of N needed to sustain high rates of C sequestration. Additionally, N amendment experiments in the field did not increase Sphagnum production, indicating that mosses are not limited by N. Lastly, by examining the composition and abundance of N2-fixing prokaryotes by quantifying gene expression of 16S rRNA and nitrogenase-encoding nifH, we show that rates of N2-fixation are driven by the substantial contribution from methanotrophs, and not from cyanobacteria. We conclude biological N2-fixation drives high sequestration of C in pristine peatlands, and may play an important role in moderating fluxes of methane, one of the most important greenhouse gases produced in peatlands. Understanding the mechanistic controls on biological N2-fixation is crucial for assessing the fate of peatland carbon stocks under scenarios of climate change and enhanced anthropogenic N deposition. © 2014, The Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83596
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: Department of Biology, Villanova University, Villanova, PA, United States; Department of Plant Biology, Southern Illinois University, Carbondale, IL, United States; Department of Geography, McGill University, Montréal, QC, Canada; Department of Land, Air & Water Resources, University of California, Davis, Davis, CA, United States; Department of Geography & the Environment, Villanova University, Villanova, PA, United States
Recommended Citation:
Vile M.A.,Kelman Wieder R.,Živković T.,et al. N2-fixation by methanotrophs sustains carbon and nitrogen accumulation in pristine peatlands[J]. Biogeochemistry,2014-01-01,121(2)