inscription
Portail d'information géographique

Résultats de la recherche (34 résultats)

Affinez votre recherche

Par Collection Par Auteur Par Date Par Sujet Par Titre
  • Tropical deforestation and forest management under the system of concession logging: a decision-theoretic analysis
  • Behaviour ; Cost-benefit analysis ; Decision ; Deforestation ; Forest ; Forest policy ; Forest resources ; Logging ; Markov chain ; Resource management ; Tropical rain forest
  • Deforestation caused by concession logging is often the result of harvest decisions which focus on short-run profits. A sequential-decision model is developed which focuses on a logger's annual decisions of whether or not remain in compliance
  • with the terms of a concession contract. Noncompliance is taken to result in deforestation. An optmal decision policy is employed to construct payoff incentives which encourage compliance.
  • 1993
  • Post-deforestation soil loss from steepland hillslopes in Taranaki, New Zealand
  • Déforestation ; Erosion des sols ; Glissement de terrain ; Mouvement de masse ; North Island ; Nouvelle-Zélande ; Précipitation ; Versant
  • Deforestation ; Landslide ; Mass movement ; New Zealand ; North Island ; Precipitation ; Slope ; Soil erosion
  • . Regolith depth and slope angle data were collected along 19 profile lines and 30 profile lines from steepland basins that had been deforested for 10 and 85 years, respectively.
  • 1993
  • Deforestation and regrowth in Miombo woodland, SW Tanzania
  • Cultivated plants ; Deforestation ; LANDSAT ; Land use ; MSS ; Reforestation ; Remote sensing ; Tanzania ; Tobacco
  • Deforestation is a general problem in Tanzania. One of the major reasons is tobacco farming. The study area is the major tobacco producing area in Mbeya Region, Chunya district. A procedure has been made for estimating deforestation and regrowth
  • 1993
  • Himalayan deforestation, changing river discharge, and increasing floods : myth or reality
  • Deforestation ; Environmental management ; Flood ; Fluvial hydrology ; Himalaya ; Human impact ; India ; Inundation ; Mountain ; Watershed
  • 1993
  • The effects of deforestation on slope and channel evolution in the tectonically active Darjeeling Himalaya
  • Alluvial cone ; Deforestation ; Fault ; Himalaya ; India ; Land use ; Mass movement ; Quaternary ; Slope ; Soil erosion ; Tectonics ; Vertical movement
  • The main indicators of Quaternary tectonic uplift are the young mountain slopes of the Darjeeling Himalaya. Owing to deforestation and extensive land use, the earlier natural tendency of a dominance of channel incision over slope degradation has
  • 1993
  • Afrique, paléoclimats et déforestation
  • Africa ; Climatic variation ; Deforestation ; Drought ; Forest ; Palaeo-environment ; Palaeoclimate ; Palaeoclimatology ; Palynology ; Tropical zone
  • 1993
  • Tropical deforestation: small farmers and land clearing in the Ecuadorian Amazon
  • Agricultural colonization ; Amazon Basin ; Deforestation ; Ecuador ; Forest ; Impact study ; Nature conservation ; Tropical zone
  • 1993
  • Arid area ; Climate ; Crisis ; Deforestation ; Desertification ; Development strategy ; Environment ; Environmental degradation ; Erosion control ; Local economy ; Mauritania ; Sand ; Village
  • Au pied du versant ouest du Tagant, un dernier village commerçant d'origine coloniale tente de résister à l'ensablement. La déforestation, imputable à la croissance rapide de la ville dans les années 60, a favorisé l'érosion éolienne qui, à son tour
  • 1993
  • Deforestation ; Equatorial forest ; Forest ; Indonesia ; Remote sensing
  • Avec une résolution de 7,5 mètres, les photographies de la station MIR permettent une analyse détaillée du processus de déforestation de la forêt pluviale. - (D. Rouvière).
  • 1993
  • China ; Deforestation ; Drought ; Flood ; Human impact ; Impact ; Karst ; Soil properties ; Water resources
  • The bare karst is the more widespread karst type in southern China. It is frequented by many environmental problems, such as drought, flood, water pollution, and deforestation. Surface collapse with 768 cases and 29 165 collapse pits is the major
  • 1993
  • Bibliography ; Biogeography ; Biological indicator ; Deforestation ; Ecosystem ; Environment ; Forest ; Tropical rain forest ; Vegetation dynamics
  • 1993
  • Agroforestry ; Deforestation ; Forest ; Land use ; Organic materials ; Savanna ; Soil ; Soil erosion ; Tropical zone
  • on organic matter processes. The final aim is to evaluate possible practices for conserving soil organic matter and maximizing sustainability in tropical cultivation systems after deforestation.
  • 1993
  • Preliminary analysis of spatial and temporal distribution of soil moisture on a deforested slope
  • 1993
  • Action anthropique ; Changement global ; Déforestation ; Effet de serre ; Environnement ; Erosion littorale ; Glacier ; Géomorphologie ; Niveau marin ; Pergélisol ; Précipitation ; Ruissellement ; Réchauffement climatique ; Télédétection
  • Climatic warming ; Coastal erosion ; Deforestation ; Environment ; Geomorphology ; Glacier ; Global change ; Greenhouse effect ; Human impact ; Permafrost ; Precipitation ; Remote sensing ; Rill wash;Runoff ; Sea level ; Vegetation
  • 1993
  • Asia ; Carbon dioxide ; Climatic variation ; Deforestation ; Ecological imbalance ; Environment ; Forest ; Global change ; Greenhouse effect ; Land use ; South-Eastern Asia ; Southern Asia
  • du sol. On insiste sur les effets et méfaits de la déforestation. - (JPB)
  • 1993
  • Agriculture ; Albania ; Deforestation ; France ; Human impact ; Italy ; Karst ; Land use ; Mediterranean area ; Pollution ; Vegetation ; Water resources
  • Particular reference is made in this paper to human impacts on karsts in France, Italy and the Dinaric region, where the most notable impacts are on natural vegetation, soil and water resources. Deforestation commenced in the Neolithic and erosion
  • 1993
  • Acid rain ; Atmospheric pollution ; Bibliography ; Deforestation ; Environment ; Global change ; Greenhouse effect ; Land use ; Pollution
  • 1993
  • Etude de la forêt comme un symbole de la culture russe. La déforestation correspondrait à la perte de moralité et au vide spirituel actuellement constatés dans les cultures occidentales et soviétiques dans les années 1970 et 1980. On évoque le lien
  • 1993
  • Algeria ; Deforestation ; Environmental degradation ; Mountain ; Peasantry ; Rural planning ; Soil erosion
  • 1993
  • Biogeography ; Canada ; Cold area ; Deforestation ; Environment ; Human impact ; Northwest Territories ; Vegetation ; Vegetation dynamics
  • 1993