Nom du corpus

Corpus Systématique Végétale

Titre du document

Shrub expansion at the foresttundra ecotone: spatial heterogeneity linked to local topography

Lien vers le document
Éditeur
IOP
Langue(s) du document
Anglais
Type de document
Brief-communication
Mots-clés d'auteur
  • Letter
  • Special Issue on Dynamics of Arctic and Sub-Arctic Vegetation
  • Betula glandulosa
  • climate change
  • foresttundra ecotone
  • shrub expansion
  • topography
Nom du fichier dans la ressource
Syst_veg6_v2_002265
Auteur(s)
  • P Ropars 1
  • S Boudreau 1
Affiliation(s)
  • 1) Northern Research Chair on Disturbance Ecology, Centre dtudes nordiques, Dpartement de biologie, Universit Laval 1045, avenue de la Mdecine, Qubec, QC, G1V 0A6, Canada
Résumé

Recent densification of shrub cover is now documented in many Arctic regions. However, most studies focus on global scale responses, yielding very little information on the local patterns. This research aims to quantify shrub cover increase at northern treeline (Qubec, Canada) in two important types of environment, sandy terraces and hilltops (which cover about 70 of the landscape), and to identify the species involved. The comparison of a mosaic of two aerial photographs from 1957 (137km2) and one satellite image taken in 2008 (151km2) revealed that both hilltops and terraces recorded an increase in shrub cover. However, the increase was significantly greater on terraces than on hilltops (21.6 versus 11.6). According to ground truthing, the shrub cover densification is associated mainly with an increase of Betula glandulosa Michx. The numerous seedlings observed during the ground truthing suggest that shrub densification should continue in the future.

Catégories INIST
  • 1 - sciences appliquees, technologies et medecines
  • 2 - sciences biologiques et medicales
  • 3 - sciences biologiques fondamentales et appliquees. psychologie
  • 4 - biotechnologie
Identifiant ISTEX
DCE5CE36DF29CFA018349891B4FA14E5DEB63EAC
Revue

Environmental Research Letters

Année de publication
2012
Présence de XML structuré
Non
Score qualité du texte
8.699
Version PDF
1.4
Type de publication
Journal
ark:/67375/0T8-D4D3XDXS-R
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