Trees

, Volume 30, Issue 3, pp 627–638 | Cite as

Can tree-ring δ15N be used as a proxy for foliar δ15N in European beech and Norway spruce?

  • G. Tomlinson
  • N. Buchmann
  • R. Siegwolf
  • P. Weber
  • A. Thimonier
  • E. Graf Pannatier
  • M. Schmitt
  • M. Schaub
  • P. Waldner
Original Article
Part of the following topical collections:
  1. Tree Rings

Abstract

Key message

For long-term environmental investigations, tree-ring δ15N values are inappropriate proxies for foliar δ15N for bothFagus sylvaticaandPicea abiesunder moderate N loads.

Abstract

Currently it is unclear whether stable nitrogen isotope signals of tree-rings are related to those in foliage, and whether they can be used to infer tree responses to environmental changes. We studied foliar and tree-ring nitrogen (δ15N) and carbon (δ13C) isotope ratios in European beech (Fagus sylvatica L.) and Norway spruce (Picea abies L.) from six long-term forest monitoring sites in Switzerland together with data on N deposition and soil N availability, as well as a drought response index over the last two decades. For both species, tree-ring δ15N and δ13C values were less negative compared to foliar δ15N and δ13C values, most likely due to recycling and reallocation of N within the tree and fractionation processes associated with the transport of sucrose and the formation of tree-rings, respectively. Temporal trends recorded in foliar δ15N were not reflected in tree-ring δ15N, with much higher variations in tree-rings compared to foliage. Soil N availability and N deposition were partially able to explain changes in foliar δ13C, while there were no significant correlations between environmental variables and either tree-ring or foliar δ15N. Our results suggest an uncoupling between the N isotopic composition of tree-rings and foliage. Consequently, tree-ring δ15N values are inappropriate proxies of foliar δ15N values under low-to-moderate N deposition loads. Furthermore, at such low levels of deposition, tree-ring δ15N values are not recommended as archives of tree responses to soil C/N or bulk N deposition.

Keywords

Tree-ring Foliage Nitrogen Carbon Isotope Archive 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • G. Tomlinson
    • 1
  • N. Buchmann
    • 2
  • R. Siegwolf
    • 3
  • P. Weber
    • 1
  • A. Thimonier
    • 1
  • E. Graf Pannatier
    • 1
  • M. Schmitt
    • 1
  • M. Schaub
    • 1
  • P. Waldner
    • 1
  1. 1.WSL, Swiss Federal Institute for Forest, Snow and Landscape ResearchBirmensdorfSwitzerland
  2. 2.Department of Environmental Systems ScienceETH ZurichZurichSwitzerland
  3. 3.Ecosystem Fluxes Group, Paul Scherrer Institute (PSI)VilligenSwitzerland

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