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Carbon and oxygen isotopes of lakeshore black spruce trees in northeastern Canada as proxies for climatic reconstruction.

Naulier, Maud; Savard, Martine M.; Bégin, Christian; Marion, Joëlle; Arseneault, Dominique; Bégin, Yves (2014). Carbon and oxygen isotopes of lakeshore black spruce trees in northeastern Canada as proxies for climatic reconstruction. Chemical Geology , vol. 374–37 . p. 37-43. DOI: 10.1016/j.chemgeo.2014.02.031.

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Résumé

In the boreal zone of northeastern Canada, paleoclimatic reconstructions of millennial length are rare and long isotopic climatic records are unavailable. However, millennial tree-ring series could be constructed within the region by cross-dating sub-fossil stems preserved in the littoral part of lakes. Thus, there is a need to evaluate the potential of using stable isotopes of lakeshore black spruce trees (Picea mariana [Mill] B.S.P.) as proxies for climatic reconstruction. We collected four living riparian black spruce trees and we investigated the inter- and intra-tree correlations for four trees, at two different sampling heights (1 and 4 m), for their carbon (δ¹³C) and oxygen (δ¹⁸O) isotopes, as a test for potential long-term reconstruction. A significant correlation (Pearson coefficient) for the isotopic series was found for the two sampling heights (r = 0.92 for δ¹³C; 0.65 for δ¹⁸O), and between the four trees. We further assessed the climatic significance of the mean of the four trees. The strongest correlation of the δ¹³C series was with the mean of June to August vapor pressure deficit (VPD; r = 0.50), and the δ¹⁸O values with the June to August climatic index and June to July maximal temperature (r = − 0.61 and 0.55, respectively). This study suggests that δ¹⁸O series of riparian black spruce trees, and eventually their sub-fossil counterparts, can be used as proxies for reconstructing long climatic series in northeastern Canada.

Type de document: Article
Mots-clés libres: stable isotopes; dendroclimatology; black spruce; riparian trees; Boreal forest
Centre: Centre Eau Terre Environnement
Date de dépôt: 11 avr. 2018 13:53
Dernière modification: 13 avr. 2018 19:02
URI: http://espace.inrs.ca/id/eprint/3642

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