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Résultats de la recherche (113 résultats)

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Par Collection Par Auteur Par Date Par Sujet Par Titre
  • Tropical rain forests
  • Biogeography ; Ecology ; Ecosystem ; Forest ; Habitat ; Photosynthesis ; Tree species ; Tropical rain forest
  • The A. reviews the mainstream ecological literature from 1994 to 1995 to gauge the importance of ecophysiological studies in understanding the ecology of tropical rain forests.
  • 1996
  • Wind disturbance and development of a near-edge forest interior, Mary Peak, Oregon coast range
  • Biogeography ; Ecology ; Exceptional event ; Forest ; Forest edge ; Forest stand ; Oregon ; Plant canopy ; Statistics ; Storm ; United States of America ; Vegetation dynamics ; Wind
  • This study examines a noble fir (Abies procera) forest in the Oregon Coast Range to assess the role of wind disturbance in creating the structural characteristics of a developing forest interior. Specifically, the AA. explore how tree age and size
  • , mortality, and regeneration of the near-edge forest interior are affected by disturbance resulting from catastrophic wind storms.
  • 1996
  • Forest ecology of the Makalu-Barun national park and conservation area, Nepal
  • Altitudinal zonation ; Bioclimatology ; Biogeography ; Conifer ; Ecotone ; Forest ; High mountain ; Leafy ; Mountain ; National park ; Nepal ; Phytogeography ; Slope exposure
  • Description of forests in Makalu-Barun National Park organized into five bioclimatic zones between 400 and 4000 m above sea level. - (DWG)
  • 1996
  • Landscape damage by skiing at Schauinsland in the Black Forest, Germany
  • Baden-Württemberg ; Black Forest ; Damage valuation ; Environmental degradation ; Germany ; Mountain ; Tourism
  • Ski runs and lifts in the Black Forest have removed vegetation cover and topsoil and caused soil erosion and solifluction. Damage varies with snow depth and duration of snow cover. Summer grazing and slope grading construction exacerbates
  • 1996
  • Palaeoenvironmental interpretation of geomorphological and pedological studies in the rain forest core-areas of Eastern Zaire (Central Africa)
  • Climatic variation ; Forest ; Geochemistry ; Palaeo-environment ; Quaternary ; Soil science ; Tropical rain forest ; Vegetation degradation ; Zaire
  • Geomorphological studies on the Late Quaternary landscape evolution in areas of eastern Zaire indicated by pedological, sedimentological, and geochemical evidence that the recent rain forest of the region within the glacial core-areas was strongly
  • 1996
  • Patterns and determinants of edge vegetation of a midwestern forest preserve
  • Biogeography ; Ecotone ; Forest ; Forest edge ; Microclimate ; Nature reserve ; Ohio ; United States of America ; Vegetation dynamics
  • This research was designed to test for vegetational edge effects along road corridors through an old-growth beech-maple forest and to discern the effects, if any, of edge age, orientation, and adjacent vegetation structure on edge composition
  • 1996
  • The trade in non-timber forest products from Nepal
  • Crop ; Forest ; Market ; Marketing ; Mountain ; Nepal ; Value added
  • 1996
  • Quantifying landscape structure: a review of landscape indices and their application to forested landscapes
  • Applied ecology ; Biodiversity ; Forest ; Forestry ; Habitat ; Landscape ; Methodology ; Scale ; Topography ; United Kingdom ; Vegetation dynamics ; Vegetation index
  • they might make to the management of forested landscapes in the UK. It is concluded that there is a pressing need for further research into the relationship between landscape pattern and ecological process.
  • 1996
  • Estimating stone and boulder content in forest soils - evaluating the potential of surface penetration methods
  • Forest ; Methodology ; Moraine ; Roughness ; Soil ; Soil properties ; Surface deposits ; Sweden
  • This study aims a) to investigate the stoniness (relative volume of stones and boulders) of representative forest soils in central Sweden, b) to evaluate the possibilities to predict soil stoniness with non-destructive surface penetration methods
  • 1996
  • [b1] Swedish University of Agricultural Sciences, Dept. of Forest soils, Uppsala, Suede
  • Forest edges and the soil-vegetation-atmosphere interaction at the landscape scale: the state of affairs
  • Atmosphere ; Atmospheric circulation ; Atmospheric dynamics ; Energy balance ; Evaporation ; Forest ; Forest edge ; Land atmosphere interaction ; Plant canopy ; Soil ; Vegetation
  • boundaries. Then it reports on the rate at which the thickness of a new equilibrium internal boundary layer downwind of a roughness change builds up. This rate is found to be one order of magnitude larger over forest as compared to lower vegetation. Recently
  • 1996
  • Geomorphic and forest cover controls on monsoon flooding, central Nepal Himalaya
  • Deforestation is often blamed as the principal cause of flooding during the monsoon period. However, bank-fall discharge at 22 stream crossings provide data to show that 82 percent of its veriation had nothing to do with forest cover. - (DWG)
  • 1996
  • Deforestation ; Econometry ; Economic analysis ; Environment ; Environmental management ; Forest ; Forest resources ; Logging ; Nature conservation ; Stand treatment ; Tropical rain forest
  • 1996
  • Ecology ; Economic development ; Economic policy ; Forest ; Forest policy ; Forest stand ; Laos ; Logging ; Tropical rain forest ; Vegetation degradation
  • 1996
  • Afforestation ; China ; Deforestation ; Ecology ; Forest soil ; Land use ; Mountain ; Pastureland ; Qinghai ; Resource management ; Slope gradient ; Soil ; Tibet
  • The southeast Qinghai-Xizang (Tibetan) Plateau is a physical region with optimum hydrothermal conditions, alpine soils and most types of Chinese forest soils. At present, partial soil resources are being damaged and the mountain ecology also tends
  • to be instable. So rational cutting and forest conservation, barren mountain afforestation, returning the cultivated land on steep slopes to forest, controlled grazing, and soil amelioration constitute important means for rational use of soil resources
  • 1996
  • The Russian forest sector: prospects for trade with the former Soviet Republics
  • Consumption ; Export ; Forest ; Forest resources ; Forestry ; Former USSR ; Marketing ; Production ; Wood ; Wood industry
  • 1996
  • Soil hydrophobicity variations with depth and particle size fraction in burned and unburned Eucalyptus globulus and Pinus pinaster forest terrain in the Águeda Basin, Portugal
  • Arid area ; Experimentation ; Fire ; Forest soil ; Grain size distribution ; Land use ; Mediterranean area ; Portugal ; Soil ; Soil properties ; Soil water ; Statistics ; Viseu
  • A laboratory programme of water drop penetration tests is used to investigate the nature of hydrophobicity of soils in unburnt and 1986-burn and 1991/1992 burn Eucalyptus globulus and Pinus pinaster forest areas of northern Portugal. Variations
  • 1996
  • Statistical analysis for the spatial validity of a model to forecast the daily number of forest fires
  • Applied climatology ; Forecast ; Forest ; Forest fire ; Model ; Natural hazards ; Spain ; Statistics ; Temperature
  • 1996
  • Multivariate geomorphic analysis of forest streams: implications for assessment of land use impacts on channel condition
  • This study quantifies geomorphic characteristics of 23 gravel-bedded, forest stream reaches grouped into 2 categories: 1) undisturbed, and 2) heavily impacted by timber harvesting and associated road building (disturbed). Disturbed reaches
  • 1996
  • [b1] U.S.D.A., Forest Service, Pacific Northwest Research Station, Juneau, AK 99801-8545, Etats-Unis
  • Case study of local involvement in protecting the Mindo y Nambillo forest west of Quito. Concludes that neither a bottoms-up nor top-down approach is likely to ensure the future integrity for this forest. - (DWG)
  • 1996
  • Application of an new meso-scale model to predict acidification of freshwaters to a small catchment in the Kaufunger Forest, Germany
  • 1996
  • [b2] Forest Research Station of Lower Saxony, Göttingen, Allemagne