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Secondary controls of alpine treeline elevations in the western USA

Auteur(s) et Affiliation(s)

GRAFIUS, D.R.
Dep. of Geography, Univ. of Iowa, Iowa City, Etats-Unis
MALANSON, G.P.
Dep. of Geography, Univ. of Iowa, Iowa City, Etats-Unis
WEISS, D.
Yellowstone Ecological Research Centre, Montana, Bozeman, Etats-Unis


Description :
The AA. examine data from treelines across the western USA, divided into subregions to elucidate the patterns of these additional constraints. They determined the best predictor of elevation for 930 treeline sites in 26 mountain ranges by finding a climate variable with least variance. They used the variance at each site from this predictor to compute an elevation anomaly that became the dependent variable in correlation and regression analyses. They derived independent variables from digital elevation models and regional climate interpolations. The results show variables related to water and energy play a secondary role. The AA. found that the division of the observations into regions and interpretation of spatial patterns within regions was necessary to interpret the relations between the potential predictor variables and the elevation anomaly.


Type de document :
Article de périodique

Source :
Physical geography, issn : 0272-3646, 2012, vol. 33, n°. 2, p. 146-164, nombre de pages : 19, Références bibliographiques : 5 p.

Date :
2012

Editeur :
Pays édition : Royaume-Uni, Abingdon, Taylor and Francis

Langue :
Anglais
Droits :
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