inscription
PORTAIL D'INFORMATION GÉOGRAPHIQUE

Résultats de la recherche (107 résultats)

Affinez votre recherche

Par Collection Par Auteur Par Date Par Sujet Par Titre
  • Tropical rain forests
  • Bibliography ; Ecology ; Forest ; Hydrology ; Nature conservation ; Population dynamics ; Tropical zone
  • 1991
  • Atlas histórico-forestal de Andalucía. Siglo XVIII
  • Andalusia ; Atlas ; Eighteenth Century ; Forest ; Historical mapping ; Mountain ; Spain
  • 1991
  • La economía forestal en los municipios con « pinos de privilegio » de la Tierra Pinariega de Burgos
  • Burgos ; Castilla-León ; Forest ; Forest exploitation ; Forest resources ; Forestry ; Historical geography ; Middle mountain ; Mountain economy ; Pine ; Spain
  • 1991
  • Structural dynamics of a Southwestern pine forest under chronic human influence
  • Climatic variation ; Forest ; Human impact ; Land use ; Landscape ; Natural park ; New Mexico ; Pine ; United States ; Vegetation ; Vegetation dynamics
  • The paper examines the impact of several synchronous disturbances, both natural and anthropogenic on the development of the Navajo ponderosa pine forest in the Chuska Mountains of the American Southwest during the fast several hundred years
  • . The specific objective is to determine the relative importance of historical factors, grazing, fire regime alteration, as well as climate fluctuations, in changing the forest pattern.
  • 1991
  • 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
  • 1991
  • Ground frost restriction of subarctic Picea abies forest in Northern Sweden. A dendroecological analysis
  • Biogeography ; Climatic variation ; Dendrochronology ; Dendrology ; Forest ; Ground frost;Ground freezing ; Permafrost ; Sweden ; Tree line
  • 1991
  • Canada ; Ecological movement ; Forest ; Forest exploitation ; Forest policy ; Quebec
  • 1991
  • Classification of forest litter
  • Classification ; Ecosystem ; Forest ; Litter ; Taiga ; Taxonomy
  • 1991
  • Ardenne ; Belgium ; Ecosystem ; Forest ; Geochemistry ; Soil
  • Forest decline in Southern Belgium and in Luxembourg is unevenly distributed. Mapped soil/lithological characteristics could not explain health patterns of the stands. Soil and foliar analyses provided valuable data related with forest decline
  • 1991
  • Spatial and temporal variations in temperate forest soil carbon dioxide during the non-growing season
  • In 1985-86 a study was undertaken in a temperate forest in north Georgia to examine spatial and temporal variations in soil CO2 and the factors that might be responsible for the observed patterns. Variations in soil CO2 with depth and the influence
  • 1991
  • Forest ; Forest exploitation ; Forestry ; Himalaya ; Mountain ; Natural resources ; Nepal ; Project ; Resource management ; Traditional society
  • and economic status dominated the decision-making, even though it was the women and poor who depended on the forests for their fuelwood and fodder products. - (DWG)
  • 1991
  • New developments in techniques for measuring soil erosion in burned and unburned forested catchments, Portugal
  • Catchment area;Watershed ; Fire ; Forest ; Portugal ; Soil erosion ; Water quality
  • This paper concerns the description and preliminary results from two complementary techniques developed for measuring soil erosion under different land uses in a study of forest fire impact on soil erosion and water quality in the Agueda basin
  • 1991
  • Climate ; Cold area ; Conifer ; Ecology ; Evergreen forest ; Forest ; Geomorphology ; Northern hemisphere ; Phytogeography ; Soil ; Taiga ; World
  • 1991
  • Forest and woodland depletion in the Lake Elementeita Basin, Kenya
  • Agricultural colonization ; Agrosystem;Farming systems ; Catchment area;Watershed ; Deforestation ; Environmental degradation ; Forest ; Human impact ; Kenya ; Land clearing ; Population pressure ; Rift Valley ; Soil erosion
  • 1991
  • Geochemical migration of radionuclides in forest ecosystems within the radioactive contamination zone of the Chernobyl nuclear power plant
  • Chernobyl ; Ecosystem ; Forest ; Geochemistry ; Litter ; Pollution ; Radioactivity ; Rill wash;Runoff ; Soil pollution ; Ukraine
  • 1991
  • Effect of acid precipitation on soil properties in a southern taiga forest ecosystem : a laboratory experiment
  • Acid rain ; Ecosystem ; Experimentation ; Forest soil ; Geochemistry ; Precipitation ; Rainfall simulation ; Soil pollution
  • 1991
  • The northern natures - a study of the forest question emerging within the timber-line conflict in Finland
  • Finland ; Forest ; Natural environment ; Natural resources ; Nature reserve ; Rational use
  • 1991
  • Atlas ; Ecosystem ; Forest ; Forest management ; Forest resources ; Forestry ; France ; Human impact ; Tree species ; Wood industry
  • 1991
  • Forest harvesting geomorphic effects in a submediterranean granitic middle mountain. Mont Lozère, South of the Massif Central, France. First results
  • Here are the very first results attesting the evidence of removal after forest harvesting operations, both by erosion and sedimentation, yet without exportation out of the catchment.
  • 1991
  • Biogeography ; Forest ; Forest exploitation ; Forest stand ; German Democratic Republic ; Germany ; Natural resources ; Resource management
  • 1991