Contrasting denitrifier communities relate to contrasting N2O emission patterns from acidic peat soils in arctic tundra

@article{Palmer2012ContrastingDC,
  title={Contrasting denitrifier communities relate to contrasting N2O emission patterns from acidic peat soils in arctic tundra},
  author={K. Palmer and C. Biasi and M. Horn},
  journal={The ISME Journal},
  year={2012},
  volume={6},
  pages={1058-1077}
}
Cryoturbated peat circles (that is, bare surface soil mixed by frost action; pH 3–4) in the Russian discontinuous permafrost tundra are nitrate-rich ‘hotspots’ of nitrous oxide (N2O) emissions in arctic ecosystems, whereas adjacent unturbated peat areas are not. N2O was produced and subsequently consumed at pH 4 in unsupplemented anoxic microcosms with cryoturbated but not in those with unturbated peat soil. Nitrate, nitrite and acetylene stimulated net N2O production of both soils in anoxic… Expand
Denitrification Activity of a Remarkably Diverse Fen Denitrifier Community in Finnish Lapland Is N-Oxide Limited
TLDR
The collective data indicate (i) a high denitrification and N2O consumption potential, and (ii) a highly diverse, nitrate limited denitrifier community associated with potential N 2O fluxes in a pH-neutral fen soil. Expand
Actinobacterial Nitrate Reducers and Proteobacterial Denitrifiers Are Abundant in N2O-Metabolizing Palsa Peat
TLDR
The collective data suggest that (i) the source and sink functions of palsa peat soils for N2O are associated with denitrification, (ii) actinobacterial nitrate reducers and nirS-type and nosZ-harboring proteobacterial denitrifiers are important players, and (iii) acidic soils like p salsa peats represent reservoirs of diverse acid-tolerant denitRifiers associated with N2 O fluxes. Expand
Archaeal nitrification is a key driver of high nitrous oxide emissions from arctic peatlands
Abstract Bare peat surfaces created by frost action and wind erosion in permafrost peatlands have been shown to emit high amounts of nitrous oxide (N2O). With global warming, emissions of this highlyExpand
Burkholderiaceae Are Key Acetate Assimilators During Complete Denitrification in Acidic Cryoturbated Peat Circles of the Arctic Tundra
Cryoturbated peat circles (pH 4) in the Eastern European Tundra harbor up to 2 mM pore water nitrate and emit the greenhouse gas N2O like heavily fertilized agricultural soils in temperate regions.Expand
Sources of nitrous oxide and fate of mineral nitrogen in sub-Arctic permafrost peat soils
Nitrous oxide (N2O) emissions from permafrost-affected terrestrial ecosystems have received little attention, largely because they have been thought to be negligible. Recent studies, however, haveExpand
High N2O consumption potential of weakly disturbed fen mires with dissimilar denitrifier community structure
Abstract Peat soils can be strong sources of atmospheric nitrous oxide (N2O), but at the same time act as sinks for the greenhouse gas N2O. However, the role of N2O reduction to dinitrogen (N2) hereExpand
Denitrifiers, nitrogen-fixing bacteria and N2O soil gas flux in high Arctic ice-wedge polygon cryosols.
TLDR
In the present study, metatranscriptomic analyses of active layer Arctic cryosols identified active nitrogen-fixing and denitrifying bacteria that included members of Rhizobiaceae, Nostocaceae, Cyanothecaceae, Rhodobacteraceae, Burkholderiaceae, Chloroflexaceae, Azotobacter Families and Ectothiorhodospiraceae. Expand
Rapid Conversion of Added Nitrate to Nitrous Oxide and Dinitrogen in Northern Forest Soil
ABSTRACT The aims of this study were to simulate wet deposition of atmospheric nitrate (NO3−) onto forest soils and trace its fate via conversion spatially and temporally into gaseous productsExpand
Nitrogen Loss from Pristine Carbonate-Rock Aquifers of the Hainich Critical Zone Exploratory (Germany) Is Primarily Driven by Chemolithoautotrophic Anammox Processes
TLDR
Results clearly demonstrate the relevance of anammox as a key process driving nitrogen loss from oligotrophic groundwater environments, which might further be enhanced through coupling with incomplete nitrification. Expand
Heterogeneity of carbon loss and its temperature sensitivity in East-European subarctic tundra soils.
TLDR
Carbon in the old bare peat is stabilized by a combination of physical, chemical and biological controls including soil compaction, organic carbon quality, low microbial biomass and the absence of plants. Expand
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