inscription
PORTAIL D'INFORMATION GÉOGRAPHIQUE

Résultats de la recherche (2202 résultats)

Affinez votre recherche

Par Collection Par Auteur Par Date Par Sujet Par Titre Par ville ? Par pays ? Par continent ?
  • Human ecology of the Sonoran Desert
  • Adaptation ; Arizona ; Désert ; Ecologie humaine ; Etats-Unis ; Irrigation ; Paysage culturel ; Perception ; Relation homme-environnement ; Ressource en eau ; Sonoran Desert ; Utilisation de l'eau
  • Adaptation ; Arizona ; Cultural landscape ; Desert ; Human ecology ; Irrigation ; Man-environment relations ; Perception ; United States of America ; Water resources ; Water use
  • The cultural landscape of the Sonoran Desert, one of the largest North American deserts, has changed greatly over the last five centuries. Five selected vignettes illustrate the changing human perceptions and uses of the desert's limited water
  • Late Quaternary arthropod remains from Sonoran Desert packrat middens, southwestern Arizona and northwestern Sonora
  • Arizona ; Biostratigraphie ; California ; Datation C14 ; Domaine aride ; Etats-Unis ; Géographie physique ; Insecte ; Paléo-environnement ; Paléoclimat ; Quaternaire ; Sonoran Desert
  • temperature and precipitation) at lower latitudes and elevations may have resulted in minimal changes in the arthropod fauna of the Sonoran Desert lowlands.
  • Climatic effects on regeneration trends for two columnar cacti in the northern Sonoran Desert
  • Action anthropique ; Arizona ; Biogéographie ; Cactus ; Domaine aride ; Dynamique des populations ; Désert ; Etats-Unis ; Holocène ; Variation climatique ; Végétation
  • Arid area ; Arizona ; Biogeography ; Climatic variation ; Desert ; Holocene ; Human impact ; Population dynamics ; United States ; Vegetation
  • This paper examines relationships of population dynamics to climatic fluctuation and anthropogenic factors in two columnar cactus species in the northern Sonoran Desert. The results underscore the responsiveness of desrt plant populations
  • Fire in the desert : initial gullying associated with the Cave Creek Complex Fire, Sonoran Desert, Arizona
  • Années 2005-2006 ; Arizona ; Domaine aride ; Désert ; Erosion des sols ; Etats-Unis ; Feu ; Mousson ; Photogrammétrie ; Photographie aérienne ; Ravinement ; Vitesse d'érosion
  • Aerial photography ; Arid area ; Arizona ; Desert ; Erosion rate ; Fire ; Gully erosion ; Monsoon ; Photogrammetry ; Soil erosion ; United States of America
  • The June 2005 Cave Creek Complex Fire is one of the largest historic wildfires to affect Arizona's Sonoran Desert. Post-fire gullying was measured using pre-fire and post-fire aerial photographs from the Maricopa County (after the 2005 and 2006
  • Holocene environmental change and vegetation contraction in the Sonoran Desert
  • Arizona ; Changement climatique ; Domaine aride ; Désert ; Etats-Unis ; Holocène ; Microstructure ; Paléo-écologie ; Quaternaire ; Sécheresse ; Végétation
  • Arid area ; Arizona ; Climatic change ; Desert ; Drought ; Holocene ; Microstructure ; Palaeo-ecology ; Quaternary ; United States of America ; Vegetation
  • The AA. investigate 2 kinds of distinct micro-topographic features that commonly occur on broad, planar surfaces of barren desert pavements in the Sonoran Desert : plant scar mounds and plant scar depressions. Eidence is presented that both features
  • Near-surface wind flow around desert shrubs
  • California ; Domaine aride ; Désert ; Eolien ; Erosion éolienne ; Etats-Unis ; Mojave desert ; Sonoran desert ; Végétation
  • Arid lands ; California ; Desert ; Eolian erosion ; Eolian features ; United States ; Vegetation
  • The role of desert shrub size and spacing on wind profile parameters
  • Arizona ; California ; Désert ; Eolien ; Etats-Unis ; Géographie de l'Amérique ; Transport éolien ; Végétation
  • This study examines the effect of shrub size and spacing on the shape of wind profiles measured above shrubs at sites in the Mojave and Sonoran Deserts. The profile data were reduced to determine the values of the profile parameters, which
  • This paper explores whether there is sufficient carbon in sediments on Sonoran Desert piedmonts for (Accelerator Mass Spectrometry) AMS 14C measurements. After describing the study site and methods, radiocarbon ages from organics found in Sonoran
  • Desert piedmont alluvium are presented. Finally, the limitations of the method and the potential implications of these ages are discussed.
  • Albedo ; Climatologie ; Couvert végétal ; Désert ; Etats-Unis ; Forêt ; Forêt décidue ; Forêt tropicale humide ; Modèle ; Radiation ; Végétation
  • Canopy ; Climatology ; Deciduous forest ; Desert ; Forest ; Model ; Radiation ; United States ; Vegetation
  • A model of radiation transfer in plant canopies is used to predict vegetation albedos. The model is described and the results of simulations for three representative canopy types (tropical rainforest, Sonoran desert and mid-latitude deciduous forest
  • Dust blown from deserts is a common phenomenon in arid and semi-arid areas. Desert dust is often transported hundreds of kilometres and much of the finer material is carried thousands of kilometres. In the Sonoran Desert soils are very susceptible
  • Saguaro (Carnegiea gigantea) densities and reproduction over the northern Sonoran Desert
  • Arizona ; Biogéographie ; Cactus ; Climat ; Domaine aride ; Dynamique des populations ; Désert ; Etats-Unis ; Précipitation ; Sonora ; Température
  • Arid area ; Arizona ; Biogeography ; Climate ; Desert ; Population dynamics ; Precipitation ; Sonora ; Temperature ; United States of America
  • Arizona ; Association végétale ; Biogéographie ; Cactus ; Domaine aride ; Désert ; Ecologie ; Etats-Unis ; Géographie physique ; Phytosiociologie ; Sonoran Desert ; Végétation
  • California ; Datation C 14 ; Désert ; Etats-Unis ; Faune ; Holocène ; Quaternaire ; Salinité ; Variation climatique ; Végétation
  • C 14 dating ; California ; Climatic variation ; Desert ; Fauna ; Holocene ; Quaternary ; Salinity ; United States of America ; Vegetation
  • of the midden has permitted a comparison of the modern flora and fauna of the site with that extant during the early Holocene. These observations are consistent with models of significant fall-winter precipitation in the Sonoran desert.
  • Biogéographie ; Domaine aride ; Désert ; Ecosystème ; Erosion des sols ; Habitat ; Impact ; Lutte contre l'érosion ; Mexique ; Plante exotique ; Sonora
  • Arid area ; Biogeography ; Desert ; Ecosystem ; Erosion control ; Habitat ; Impact ; Mexico ; Soil erosion ; Sonora
  • rates in the desert. He does find the widespread use of the grass below 1,000 m to threaten native Sonoran plant life and some native fauna. His study of the erosion rates, however, is inconclusive : the exotic grass retards soil erosion, but only after
  • Desert ‘trash’ : posthumanism, border struggles, and humanitarian politics
  • Désert ; Déshumanisation ; Emigrés ; Etats-Unis ; Frontière ; Géographie politique ; Matérialité ; Mexique ; Migration ; Objet ; Posthumanisme ; Sonora
  • Desert ; Emigrés ; Frontier ; Materiality ; Mexico ; Migration ; Object ; Political geography ; Post-humanism ; Sonora ; United States of America
  • Focussing on humanitarian engagements with the objects that migrants leave behind across the Mexico–US Sonoran desert, this article explores how the politics of human mobility involves the co-constitution of ‘people’, ‘places’ and ‘things
  • of dehumanisation through the re-configuration of ‘desert/ed trash. It concludes, in order that the multiplicity of ways by which ‘the human’ is made, unmade and remade is accounted for without assuming either the supremacy or the powerlessness of people.
  • Stone movement on hillslopes in the Mojave desert, California: a 16 year record
  • California ; Creep ; Domaine aride ; Dynamique de versant ; Désert ; Ecoulement ; Etats-Unis ; Fluviatile ; Géographie physique ; Hydrologie ; Mojave, désert ; Sonora ; Versant
  • étroitement corrélée avec la longueur de l'écoulement superficiel qu'avec l'angle de la pente suggère la prédominance de l'action hydraulique. Ceci est probablement le cas pour la plupart des déserts Mojave et Sonoran sur les pentes jusqu'à 24 au moins. C'est
  • Analyse sur seize ans du mouvement de pierres peintes sur deux versants du désert Mojave central afin de déterminer le processus prépondérant du transport des débris grossiers, creep ou action hydraulique. Le fait que la distance parcourue soit plus
  • Shear stress partitioning in sparsely vegetated desert canopies
  • Shear velocity ratios were derived for 6 neighbouring localities representing rangeland, abandoned farmland and a playa, in the semi-arid region of the Sonoran Desert. Near-surface and above-canopy wind speeds, mostly below saltation threshold, were
  • [a1] Desert Research Institute, Reno, Etats-Unis
  • Photographs taken in 1892-1893 of the United States-Mexico international boundary monuments in the Chihuahuan and Sonoran Deserts were compared to repeat photos taken 90 years later as a way of determining vegetation changes. Many areas
  • Plant macrofossils from 21 pack rat (Neotoma sp.) middens at 535-605 m from the Puerto Blanco Mountains provide an excellent history of vegetation and climate for the last 14,120 yr B.P. in the Sonoran Desert. The inferences of a latest Wisconsin
  • Arizona ; Domaine aride ; Désert ; Erosion des sols ; Etats-Unis ; Formation arbustive ; Formation herbacée ; Ruissellement ; Versant ; Vitesse d'érosion ; Végétation
  • Arid area ; Arizona ; Desert ; Erosion rate ; Grassland ; Rill wash ; Scrub ; Slope ; Soil erosion ; United States of America ; Vegetation
  • Vegetation change, from grassland to shrubland, has occurred over much of the Sonoran and Chihuahuan Deserts during the past century. The effect of this vegetation change on interrill runoff and erosion was examined by conducting rainfall-simulation