inscription
PORTAIL D'INFORMATION GÉOGRAPHIQUE

Résultats de la recherche (73 résultats)

Affinez votre recherche

Par Collection Par Auteur Par Date Par Sujet Par Titre
  • Impact of plant cover on heat and water balance in agricultural landscapes located in humidity gradient
  • Agroclimatology ; Agroecosystem ; Bioclimatology ; Ecosystem ; Heat balance ; Plant cover ; Vegetation ; Water balance
  • Investigation on heat and water balance in agricultural landscape were carried out of for six years. The impact of plants cover and habitat moisture on structure of heat and water balances was studied. Observations of micrometeorological parameters
  • 1997
  • Influences of micro-relief patterns and plant cover on runoff related processes in badlands from Tabernas (SE Spain)
  • Almería ; Arid area ; Badland ; Infiltration ; Microrelief ; Plant cover ; Rainfall simulation ; Rill wash ; Sediment budget ; Slope ; Soil erosion ; Soil properties ; Spain
  • have been selected and the following surface properties, as variables under study, have been measured : surface area occupied by cracks, rock fragments, lichens, and plants; also the surface roughness under dry conditions (before rainfall
  • 1997
  • Land-cover change and forest institutions: a comparison of two sub-basins in the southern Siwalik hills of Nepal
  • Deforestation ; Environmental management ; Forest ; Himalaya ; Land use ; Nepal ; Plant cover ; Watershed
  • institutional structures were said to explain these land-cover changes. - (DWG)
  • 1997
  • Refugees, land cover, and environmental change in the Senegal River valley
  • Africa ; Desertification ; Environment ; Mauritania ; Migration ; Plant cover ; Refugees ; Remote sensing ; Sahel ; Senegal ; Soil ; Soil erosion ; Valley
  • This paper seeks to explore the complex relationships between land cover, environmental change and forced migration in the middle valley of the Senegal River, attempting both to identify the nature of environmental impacts of forced displacements
  • with specific reference to land cover, and to examine the social, political and economic circumstances in which these are exacerbated or reduced. The paper also examines the role of land regulation in influencing the observed patterns of land cover change.
  • 1997
  • Modelling and monitoring land-cover change processes in tropical regions
  • Arid area ; Biogeography ; Deforestation ; Desertification ; Ecosystem ; Environment ; Environmental management ; Global change ; Land use ; Landscape dynamics ; Model ; Plant cover ; Spatial analysis ; Tropical zone
  • . The review highlights the requirement to tailor the investigation method to the specific research question of interest. Different techniques to monitor land-cover changes at regional scales are analysed. The article stresses the needs for a better integration
  • of social science knowledge in land-cover change models and for a comprehensive theory of land-use changes.
  • 1997
  • Comparison of sediment ratio curves for plants with different architectures
  • Ebro ; Lichen ; Mediterranean area ; Plant cover ; Rill wash ; Semi-arid area ; Soil erosion ; Soil properties ; Spain ; Splash ; Statistics ; Vegetation ; Water erosion
  • The AA. have studied the sediment ratio curves of 2 semi-arid Mediterranean species, with different cover and architecture (Rosmarinus officinalis and Lygeum spartum), in 2 field sites located in the Depression of the Ebro River (NE inland Spain
  • 1997
  • Biosphere ; Deforestation ; Ecosystem ; Geosphere ; Global change ; Human impact ; Italy ; Land use ; Mediterranean area ; Plant cover ; Research programme
  • Cet article traite de l'expérience italienne dans le cadre méditerranéen, attachant une attention toute particulière au secteur Land Use and Cover Change, sous-programme commun aux deux projets Human Dimensions Programme et International Geosphere
  • 1997
  • Applied ecology ; Canada ; Leguminous plants ; Mining activity ; Mountain ; Plant cover ; Population dynamics ; Rocky Mountains ; Soil improvement
  • 1997
  • Budapest ; Danube ; Ecosystem ; Floodplain ; Forest ; Geo-ecology ; Grassland ; Human impact ; Hungary ; Island ; Microrelief ; Plant cover ; Vegetation
  • there is any relationship between the microrelief and the soil/vegetation pattern and how it is manifested in the species composition of indicator plants under natural and disturbed conditions.
  • 1997
  • Historical land-cover changes and hydrogeomorphic adjustment in a small Georgia watershed
  • Channel geometry ; Georgia (USA) ; Gully erosion ; Historical geography ; Land use ; Lithology ; Plant cover ; Precipitation ; Rill wash ; United States of America ; Water regime ; Watershed
  • 1997
  • Geological structure ; Hungary ; Lithology ; Periglacial features ; Plant cover ; Pleistocene ; Slope exposure ; Slope gradient ; Soil water
  • between individual factors : geological structure, rocks, slope type and exposure, early Pleistocene topography, climatic conditions and percentage vegetation cover. Under identical conditions it was found that there is a striking regional asymmetry
  • 1997
  • China ; Evaporation ; Guangdong ; Land use ; Microclimate ; Model ; Plant cover ; Precipitation ; Rill wash ; Soil erosion ; Soil moisture ; Water balance ; Watershed
  • practices which maintain a vegetation cover.
  • 1997
  • Aerial photography ; Canada ; Drainage ; Gully erosion ; Lake ; Ontario ; Photointerpretation ; Plant cover ; Rill wash ; Shoreline ; Snow ; Watershed
  • An empirical approach was used to examine the morphology and behaviour of gullies along the eastern shoreline of Lake Huron, Canada. Gully and watershed dimensions and percentage vegetation cover of a sample of 44 gullies were measured from aerial
  • 1997
  • Africa ; Applied climatology ; Arizona ; Atmospheric circulation ; Atmospheric pollution ; Birmingham ; Climatic warming ; Drought ; England ; Flood ; Inundation ; Midwest ; Plant cover ; Sahel ; Soil moisture ; United Kingdom ; United States
  • 1997
  • AVHRR ; Climate ; NOAA ; Plant canopy ; Precipitation ; Radiation ; Remote sensing ; Seasonal variation ; South Africa ; Summer ; Vegetation index
  • contributes to an increase in the vegetative density and cover. - (AJC)
  • 1997
  • Aeolian features ; Arid area ; Botswana ; Dating ; Desert ; Dune ; Geochronology ; Kalahari ; Palaeo-environment ; Plant cover ; Quaternary ; Thermoluminescence
  • 1997
  • Aeolian features ; Aeolian transport ; Arid area ; California ; Climatic variability ; Climatic variation ; Desert ; Plant cover ; Precipitation ; Semi-arid area ; Soil moisture ; United States of America
  • and geomorphic record of Holocene eolian activity. At both time scales, eolian activity in southern Californian deserts is strongly controlled by variations in precipitation. Remobilization of existing dormant dunes is a product of reduced vegetation cover
  • and soil moisture in periods of drier climates. The major control on these processes is decadal to annual changes in rainfal that determine vegetation cover and soil moisture content.
  • 1997
  • Aeolian features ; Aeolian transport ; Barchan ; Canary Islands ; Carbonate ; Dune ; Land use ; Model ; Plant cover ; Sand ; Wind
  • 1997
  • Aeolian features ; Arid area ; Asia ; China ; Frost action ; Loess ; Microstructure ; Mongolia ; Mountain ; Plant cover ; Plateau ; Quartz ; Spatial distribution ; Tibet ; Wind
  • 1997
  • Canada ; Cartography ; Cold area ; Geographical information system ; Permafrost ; Plant canopy ; Quebec ; Snow cover ; Spatial analysis ; Subarctic zone ; Surface deposits
  • 1997