Dépôt numérique
RECHERCHER

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 et Bégin, Yves (2014). Carbon and oxygen isotopes of lakeshore black spruce trees in northeastern Canada as proxies for climatic reconstruction. Chemical Geology , vol. 374–375 . pp. 37-43. DOI: 10.1016/j.chemgeo.2014.02.031.

Ce document n'est pas hébergé sur EspaceINRS.

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: 25 oct. 2018 13:15
URI: https://espace.inrs.ca/id/eprint/3642

Gestion Actions (Identification requise)

Modifier la notice Modifier la notice