Nom du corpus

Corpus Systématique Végétale

Titre du document

Does NDVI reflect variation in the structural attributes associated with increasing shrubdominance in arctic tundra?

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Éditeur
IOP
Langue(s) du document
Anglais
Type de document
Article
Mots-clés d'auteur
  • Arctic tundra
  • normalized difference vegetation index
  • shrub dominance
  • vegetation structure
Nom du fichier dans la ressource
Syst_veg6_v2_007171
Auteur(s)
  • Natalie T Boelman 1
  • Laura Gough 2
  • Jennie R McLaren 2
  • Heather Greaves 3
Affiliation(s)
  • 1) Lamont-Doherty Earth Observatory, Columbia University, 61 Route 9W, Palisades, NY 10964, USA
  • 2) Department of Biology, University of Texas at Arlington, Arlington, TX 76019, USA
  • 3) Department of Forest Ecosystems and Society, Oregon State University, 321 Richardson Hall, Corvallis, OR 97331, USA
Résumé

This study explores relationships between the normalized difference vegetation index(NDVI) and structural characteristics associated with deciduous shrub dominance in arctictundra. Our structural measures of shrub dominance are stature, branch abundance, aerialpercent woody stem cover (deciduous and evergreen species), and percent deciduous shrubcanopy cover. All measurements were taken across a suite of transects that togetherrepresent a gradient of deciduous shrub height. The transects include tussock tundra shruband riparian shrub tundra communities located in the northern foothills of theBrooks Range, in northern Alaska. Plot-level NDVI measurements were made in2010 during the snow-free period prior to deciduous shrub leaf-out (early June,NDVIpre leaf), at the point in the growing season when canopy NDVI hasreached half of its maximum growing season value (mid-June,NDVIdemi leaf) and during the period of maximum leaf-out (late July,NDVIpeak leaf). We foundthat: (1)NDVIpre leaf is best suited to capturing variation in the percent woody stem cover, maximum shrubheight, and branch abundance, particularly between 10 and 50cm height in the canopy; (2)NDVIpeak leaf is best suited to capturing variation in deciduous canopy cover; and (3)NDVIdemi leaf does not capture variability in any of our measures of shrub dominance. These findingssuggest that in situ NDVI measurements made prior to deciduous canopy leaf-out could beused to identify small differences in maximum shrub height, woody stem cover, and branchabundance (particularly between 10 and 50cm height in the canopy). Because shrubs areincreasing in size and regional extent in several regions of the Arctic, investigation intospectrally based tools for monitoring these changes are worthwhile as they provide a firststep towards development of remotely sensed techniques for quantifying associated changesin regional carbon cycling, albedo, radiative energy balance, and wildlife habitat.

Catégories INIST
  • 1 - sciences appliquees, technologies et medecines
  • 2 - sciences biologiques et medicales
  • 3 - sciences biologiques fondamentales et appliquees. psychologie
Catégories Scopus
  • 1 - Health Sciences ; 2 - Medicine ; 3 - Public Health, Environmental and Occupational Health
  • 1 - Physical Sciences ; 2 - Environmental Science ; 3 - General Environmental Science
  • 1 - Physical Sciences ; 2 - Energy ; 3 - Renewable Energy, Sustainability and the Environment
Catégories WoS
  • 1 - science ; 2 - meteorology & atmospheric sciences
  • 1 - science ; 2 - environmental sciences
Identifiant ISTEX
16341BDDE8F5614DBACE2AC97AFB819C5A8C8014
Revue

Environmental Research Letters

Année de publication
2011
Présence de XML structuré
Oui
Score qualité du texte
10
Version PDF
1.4
Type de publication
Journal
ark:/67375/0T8-ZM61RGH9-4
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