Mots-clés
Analyse multivariée ; Années 1984-2007 ; Badland ; Dynamique de la végétation ; Erodabilité ; Erosion des sols ; Espagne ; Indice de végétation ; LANDSAT ; Montagne ; Pyrénées centrales ; Risque ; Thematic Mapper ; Topographie ; Télédétection ; VégétationBadland ; Central Pyrenees ; Erodibility ; LANDSAT ; Mountain ; Multivariate analysis ; Remote sensing ; Risk ; Soil erosion ; Spain ; Thematic Mapper ; Topography ; Vegetation ; Vegetation dynamics ; Vegetation indexAnálisis multivariado ; Badland ; Dinámica de la vegetación ; Erodabilidad ; Erosión de los suelos ; España ; LANDSAT ; Montaña ; Riesgo ; Teledetección ; Thematic Mapper ; Topografía ; Vegetación ; Índice de vegetaciónEvolution of vegetation activity on vegetated, eroded, and erosion risk areas in the central Spanish Pyrenees, using multitemporal Landsat imagery
Auteur(s) et Affiliation(s)
ALATORRE, L.C.
Pyrenean Inst. of Ecology (CSIC), Zaragoza, Espagne
BEGUERÍA, S.
Aula Dei Experimental Station (CSIC), Zaragoza, Espagne
VICENTE-SERRANO, S.
Pyrenean Inst. of Ecology (CSIC), Zaragoza, Espagne
Description :
The temporal evolution of vegetation activity on various land cover classes in the Spanish Pyrenees was analyzed. Two time series of the normalized difference vegetation index (NDVI) were used, corresponding to March (early spring) and August (the end of summer). The series were generated from Landsat TM and Landsat ETM+ images for the period 1984–2007. An increase in the NDVI in March was found for vegetated areas, and the opposite trend was found in both March and August for degraded areas (badlands and erosion risk areas). The rise in minimum temperature and the time variation of the cloud cover during the study period appears to be the most important factors explaining increased NDVI in the vegetated areas. In degraded areas, no climatic or topographic variable was associated with the negative NDVI trend, which may be related to erosion processes taking place in these regions.
Type de document :
Article de périodique
Source :
Earth surface processes and landforms, issn : 0197-9337, 2011, vol. 36, n°. 3, p. 309-319, nombre de pages : 11, Références bibliographiques : 67 ref.
Date :
2011
Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley
Langue :
Anglais
Anglais
Droits :
Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI)
Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI)