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PORTAIL D'INFORMATION GÉOGRAPHIQUE

Résultats de la recherche (123 résultats)

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Par Collection Par Auteur Par Date Par Sujet Par Titre
  • Chemical concentrations in overland flow from different forested areas in a Mediterranean environment : burned forest at different fire intensity and unpaved road
  • Arid area ; Forest ; Forest fire ; Gerona ; Mediterranean area ; Overland flow ; Runoff ; Spain
  • 2001
  • Seeing green in Mali's woods : colonial legacy, forest use, and local control
  • Colonization ; Decentralization ; Forest ; Forest policy ; Fuelwood ; Mali ; Natural resources ; Participation ; Peasantry ; Resource management ; Social relations
  • to reform forestry policy so that forest resource user-groups could have a greater role in management. Data on income and expenditures from a periurban fuelwood-producing village show differential access to and dependence on forest resources for livelihood.
  • 2001
  • Ecology ; Environmental management ; Fire ; Forest ; Forest fire ; Impact ; Savanna ; Tropical rain forest ; Tropical zone
  • 2001
  • Gully initiation and road-to-stream linkage in a forested catchment, southeastern Australia
  • Australia ; Discriminant analysis ; Drainage ; Flood ; Fluvial dynamics ; Forest ; Gully erosion ; Impact ; New South Wales ; Rill wash ; Road ; Soil erosion ; Watershed
  • This study reports the nature of sediment delivery pathways and road-to-stream linkage in a forested catchment in southeastern Australia, and evaluates the causal factors associated with this linkage. Results are discussed within the context of road
  • 2001
  • Forest mapping and monitoring with interferometric synthetic aperture radar (InSAR)
  • Biomass ; Cartography ; Deforestation ; Forest ; Forest fire ; Freeze-thaw cycle ; Plant cover ; Radar imagery ; Remote sensing ; Sar imagery
  • 2001
  • Why are tropical rain forests so species rich ? Classifying, reviewing and evaluating theories
  • Bibliography ; Biodiversity ; Classification ; Forest ; Theory ; Tropical rain forest
  • 2001
  • Tropical rain forest and climate dynamics of the Atlantic lowland, southern Brazil, during the late Quaternary
  • Brazil ; C 14 dating ; Palaeo-environment ; Palaeoclimate ; Palynology ; Pleistocene ; Pollen diagram ; Quaternary ; Santa Catarina ; Stratigraphy ; Tropical rain forest
  • The AA. present results of an investigation into past vegetation and climate in the southern Atlantic rain forest region, using pollen and radiocarbon analysises of recently discovered late Pleistocene deposits at Volta Velha, Santa Catarina, Brazil.
  • 2001
  • Unsustainable forestry causes forest fires - a case study from Galicia (North-West Spain)
  • Development ; Environmental management ; Eucalyptus ; Forest ; Forest fire ; Forestry ; Galicia ; Spain
  • of industrial potential. Development funds proferred by the EU and altered by national and regional legislatures do not improve the disadvantageous structure of Galician forestry nor its economically and ecologically poor situation. The high incidence of forest
  • 2001
  • Effects of forest roads on flood flows in the Deschutes River, Washington
  • Hydrologic and geomorphic effects of forest roads. Special issue
  • Drainage ; Flood ; Forest ; Model ; Pic discharge ; Plant cover ; Precipitation ; Rill wash ; Snow ; Stand treatment ; United States of America ; Washington State ; Watershed
  • demonstrated that higher flows occurred in ditches draining clearcuts compared to forested areas. Contrary to expectation, road cutslope height did not seem to affect culvert peak runoff. A distributed hydrologic model was used to evaluate road effects on peak
  • 2001
  • Forest road erosion in New Zealand : overview
  • Erosion rate ; Forest ; Forestry ; Impact ; Mass movement ; New Zealand ; Road ; Sediment budget ; Soil erosion ; Watershed
  • New Zealand research relating to erosion impacts of plantation forest roads, tracks and landings has been carried out since the mid-1970s. Methods include paired catchments studies, storm-induced mass movement surveys, and surface erosion plot
  • in sediment yields from road surfaces during forest establishment and harvesting activities, annual sediment yields from catchments appear to be within natural levels.
  • 2001
  • Simulating the impact of road construction and forest harvesting on hydrologic response
  • Hydrologic and geomorphic effects of forest roads. Special issue
  • Drainage ; Evapotranspiration ; Forest ; Gully erosion ; Impact ; Model ; Oregon ; Rill wash ; Road ; Seasonal variation ; Simulation ; Soil moisture ; United States of America ; Watershed
  • Experimental Forest in the Western Oregon Cascades. A range of scenarios is used to generate hypotheses about the variability of hydrologic response to roads. Simulation results are also compared with results from an empirical study in the H.J. Andrews
  • 2001
  • Sediment production from granitic cutslopes on forest roads in Idaho, USA
  • Hydrologic and geomorphic effects of forest roads. Special issue
  • Erosion control ; Forest ; Geotechnics ; Granite ; Idaho ; Mountain ; Road ; Slope gradient ; Soil erosion ; United States of America ; Water erosion ; Weathering
  • A series of 75 non-bordered plots was used to measure surface erosion on granitic road cuts on forest roads in the mountains of Idaho. Erosion data were collected for 4 years following road construction. Both mass and surface erosion processes were
  • 2001
  • Renewal of tidal forests in Washington State after a subduction earthquake in A.D. 1700
  • Alaska ; Comparative study ; Dendrochronology ; Earthquake ; Estuary ; Forest ; Intertidal zone ; Palaeobiogeography ; Palaeogeography ; Spruce ; Subduction ; United States of America ; Vegetation dynamics ; Washington State
  • This paper presents evidence that an earthquake made such trees scarce at estuaries of westernmost Washington. Remains of dead trees and ring counts in living trees show that an A.D. 1700 earthquake reset an ecological clock by changing forests
  • into tidal flats. Postearthquake tides, and perhaps uplift as well, then created land on which new trees became established. Such renewal, seen also in Alaska after an earthquake in 1964, probably explains why Washington's tidal forests now contain few
  • 2001
  • Spatial ecology of pre-Euro-American fires in a southern Rocky Mountain subalpine forest landscape
  • Ecology ; Forest ; Forest edge ; Forest fire ; Geographical information system ; Landscape ; Landscape ecology ; Thematic mapping ; United States of America ; Wyoming
  • 2001
  • Assessment of relations between the normalised difference vegetation index (NDVI), frequency of forest fires, air temperature, sunshine, precipitation in Poland
  • AVHRR ; Air temperature ; Climate ; Climatic variability ; Fire ; Forest ; NOAA ; Poland ; Precipitation ; Remote sensing ; Vegetation index ; Years 1990-99
  • correlation coefficients and regression equations for the 10-day means of NDVI on the one hand, and temperature, precipitation, and sunshine anomalies on the other, in the period between April and September. The frequency of appearance of forest fires
  • was analysed for the same regions. The relationships between the frequency of occurrence of forest fires and NDVI values, air temperature, and precipitation were identified.
  • 2001
  • Evolution of disturbed oak woodlands : the case of Mexico City's western forest reserve
  • Climax ; Deforestation ; Environmental degradation ; Forest ; Geo-ecology ; Geosystem ; Human impact ; Mexico ; Mexico City ; Oak ; Urban development
  • 2001
  • Erosion and sediment delivery following removal of forest roads
  • California ; Drainage ; Erosion control ; Forest ; Geotechnics ; Gully erosion ; Impact ; Mass movement ; Road ; Sediment budget ; Slope gradient ; Soil erosion ; United States of America ; Watershed
  • 2001
  • Afforestation ; Agricultural land use ; Denmark ; Forest ; Forest policy ; Geographical information system ; Location ; Rural landscape
  • smaller areas. The A. argues that not only the location within designated areas but also the spatial parameters and configuration of new woodlands must be considered. Two methods (forest pictures and gradient pictures) are presented.
  • 2001
  • Forest-product SMMEs in the Wild Coast Spatial Development Initiative
  • International debates on forest-based rural small enterprise development provide the theoretical context of this study. The research focuses upon the constraints that inhibit the growth and expansion of rural non-farm small, medium and micro
  • 2001
  • Forest roads and geomorphic process interactions, Cascade Range, Oregon
  • Erosion control ; Flood ; Forest ; Geotechnics ; Impact ; Mass movement ; Mountain ; Oregon ; Rainstorm ; Road ; Sediment budget ; Soil erosion ; United States of America ; Watershed
  • A major flood in February 1996 triggered more than 100 geomorphic features affecting forest roads in a 181 km2 study area in the western Cascade Range, Oregon. Eight types of features, including mass movements and fluvial features, were mapped
  • 2001