Mots-clés
Action anthropique ; Années 1984-2011 ; Aragón ; Dynamique de la végétation ; Espagne ; Formation arbustive ; Formation herbacée ; LANDSAT ; Montagne ; Pyrénées ; Thematic Mapper ; Télédétection ; VégétationAragón ; Grassland ; Human impact ; LANDSAT ; Mountain ; Pyrénées ; Remote sensing ; Scrub ; Spain ; Thematic Mapper ; Vegetation ; Vegetation dynamicsAcción antrópica ; Dinámica de la vegetación ; España ; Formación arbustiva ; Formación herbácea ; LANDSAT ; Montaña ; Pirineos ; Teledetección ; Thematic Mapper ; VegetaciónAssessment of the effects of biophysical and anthropogenic factors on woody plant encroachment in dense and sparse mountain grasslands based on remote sensing data
Auteur(s) et Affiliation(s)
GARTZIA, M.
Inst. Pirenaico de Ecología, CSIC, Zaragoza, Espagne
ALADOS, C.L.
Inst. Pirenaico de Ecología, CSIC, Zaragoza, Espagne
PÉREZ-CABELLO, F.
Univ., Zaragoza, Espagne
Description :
This study assessed woody plant encroachment below potential tree line in the Central Pyrenees of Spain and the association of this encroachment with changes in land use. Remote sensing data from Landsat-5 Thematic Mapper (TM) from the mid-1980s and mid-2000s were analyzed by supervised classification for identification of land cover types. The transition matrix indicated that shrublands were the most dynamic plant communities. Generalized additive mixed models (GAMMs) were used to identify biophysical and anthropogenic factors that were significantly correlated with woody plant encroachment of dense and sparse grasslands. Distance to the nearest woody plant habitat (shrub or forest) was the most strongly correlated factor with woody plant encroachment of both types of grassland. This factor explained 69% and 71% of the variance in models of dense and sparse grasslands, respectively. The observed changes in land cover indicated that land cover has become more homogeneous.
Type de document :
Article de périodique
Source :
Progress in physical geography, issn : 0309-1333, 2014, vol. 38, n°. 2, p. 201-217, nombre de pages : 17, Références bibliographiques : 3 p.
Date :
2014
Editeur :
Pays édition : Royaume-Uni, London, Sage Publications
Langue :
Anglais
Anglais
Droits :
Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI)
Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI)