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Sökning: onr:"swepub:oai:lup.lub.lu.se:261db4bd-e0e7-49c1-87a8-330cb3aeb437" > Nitrogen Isotope Pa...

Nitrogen Isotope Patterns in Alaskan Black Spruce Reflect Organic Nitrogen Sources and the Activity of Ectomycorrhizal Fungi

Mayor, Jordan R. (författare)
Schuur, Edward A. G. (författare)
Mack, Michelle C. (författare)
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Hollingsworth, Terresa N. (författare)
Bååth, Erland (författare)
Lund University,Lunds universitet,MEMEG,Biologiska institutionen,Naturvetenskapliga fakulteten,Department of Biology,Faculty of Science
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 (creator_code:org_t)
Springer, 2012
2012
Engelska.
Ingår i: Ecosystems. - : Springer. - 1432-9840. ; 15:5, s. 819-831
  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
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  • Global patterns in soil, plant, and fungal stable isotopes of N (delta N-15) show promise as integrated metrics of N cycling, particularly the activity of ectomycorrhizal (ECM) fungi. At small spatial scales, however, it remains difficult to differentiate the underlying causes of plant delta N-15 variability and this limits the application of such measurements to better understand N cycling. We conducted a landscape-scale analysis of delta N-15 values from 31 putatively N-limited monospecific black spruce (Picea mariana) stands in central Alaska to assess the two main hypothesized sources of plant delta N-15 variation: differing sources and ECM fractionation. We found roughly 20% of the variability in black spruce foliar N and delta N-15 values to be correlated with the concentration and delta N-15 values of soil NH4 (+) and dissolved organic N (DON) pools, respectively. However, N-15-based mixing models from 24 of the stands suggested that fractionation by ECM fungi obscures the N-15 signature of soil N pools. Models, regressions, and N abundance data all suggested that increasing dependence on soil DON to meet black spruce growth demands predicates increasing reliance on ECM-derived N and that black spruce, on average, received 53% of its N from ECM fungi. Future research should partition the delta N-15 values within the soil DON pool to determine how choice of soil delta N-15 values influence modeled ECM activity. The C balance of boreal forests is tightly linked to N cycling and delta N-15 values may be useful metrics of changes to these connections.

Ämnesord

NATURVETENSKAP  -- Biologi (hsv//swe)
NATURAL SCIENCES  -- Biological Sciences (hsv//eng)

Nyckelord

15N
black spruce
denitrifier method
dissolved organic nitrogen
ectomycorrhiza
isotope fractionation
mixing models

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Av författaren/redakt...
Mayor, Jordan R.
Schuur, Edward A ...
Mack, Michelle C ...
Hollingsworth, T ...
Bååth, Erland
Om ämnet
NATURVETENSKAP
NATURVETENSKAP
och Biologi
Artiklar i publikationen
Ecosystems
Av lärosätet
Lunds universitet

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