Contrasting δ15N Values of Atmospheric Deposition and Sphagnum Peat Bogs: N Fixation as a Possible Cause

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F16%3A00000259" target="_blank" >RIV/00025798:_____/16:00000259 - isvavai.cz</a>

Alternative codes found

RIV/00216208:11320/16:10328913

Result on the web

<a href="http://link.springer.com/article/10.1007/s10021-016-9985-y?wt_mc=Internal.Event.1.SEM.ArticleAuthorAssignedToIssue" target="_blank" >http://link.springer.com/article/10.1007/s10021-016-9985-y?wt_mc=Internal.Event.1.SEM.ArticleAuthorAssignedToIssue</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s10021-016-9985-y" target="_blank" >10.1007/s10021-016-9985-y</a>

Result language

angličtina

Original language name

Contrasting δ15N Values of Atmospheric Deposition and Sphagnum Peat Bogs: N Fixation as a Possible Cause

Original language description

Nitrogen (N) isotope systematics were investigated at two high-elevation ombrotrophic peat bogs polluted by farming and heavy industry. Our objective was to identify N sources and sinks for isotope mass balance considerations. For the first time, we present a time-series of d15N values of atmospheric input at the same locations as d15N values of living Sphagnum and peat. The mean d15N values systematically increased in the order: input NH4+ (-10.0 per mil) < input NO3- (-7.9 per mil) < peat porewater (-5.6 per mil) < Sphagnum (-5.0 per mil) < shallow peat (-4.2 per mil) < deep peat (-2.2 per mil) < runoff (-1.4 per mil) < porewater N2O (1.4 per mil). Surprisingly, N of Sphagnum was isotopically heavier than N of the atmospheric input (P < 0.001). If partial incorporation of reactive N from the atmosphere into Sphagnum was isotopically selective, the residual N would have to be isotopically extremely light. Such N, however, was not identified anywhere in the ecosystem. Alternatively, Sphagnum may have contained an admixture of isotopically heavier N. Ambient air contains such N in the form of N2 (d15N-N2 = 0 per mil). Because high energy is required to break the triple bond, microbial N fixation is likely to proceed only under limited availability of pollutant N. Also for the first time, a d15N comparison is presented between anoxic deeper peat and porewater N2O. Isotopically light N is removed from anoxic substrate by denitrification, whose final product, N2, escapes into the atmosphere. Porewater N2O is an isotopically heavy residuum following partial N2O reduction to N2.

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

DD - Geochemistry

OECD FORD branch

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Project

<a href="/en/project/GA16-18079S" target="_blank" >GA16-18079S: Isotope constraints on microbial N2-fixation in ombrotrophic peat bogs</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2016

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Ecosystems

ISSN

1432-9840

e-ISSN

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Volume of the periodical

19

Issue of the periodical within the volume

6

Country of publishing house

US - UNITED STATES

Number of pages

16

Pages from-to

1037-1050

UT code for WoS article

000386710000007

EID of the result in the Scopus database

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