Micro-climatic determination of vegetation patterns along topographical, altitudinal, and oceanic-continental gradients in the high mountains of Norway
Altitude ; Biodiversité ; Ecologie quantitative ; Environnement ; Etagement de la végétation ; Montagne ; Norvège ; Végétation
L'A. étudie la végétation des montagnes norvégiennes en fonction de paramètres microclimatiques. L'A. synthétise des données quantitatives obtenues le long de différents gradients écologiques.
The A. hypothesizes that there is spatial variation in the linkage between and importance of macro- and micro-environmental influences on vegetation, and explores this hypothesis in a case study of riparian vegetation in the mountains of western
Colorado. He determines major gradients in vegetation variation by Bray-Curtis ordination and interprets the gradients by correlating ordination axis scores with the values of environmental variables measured at each site.
Afrique du Sud ; Biochimie ; Dissolution ; Formation superficielle ; Grès ; Géographie de l'Afrique ; Micro-végétation ; Mécanique des roches ; Météorisation ; Végétation
Relationships between size, depth, shape and structure were established. Chemical, biochemical and mechanical processes involved in development. Micro-vegetation could be important.
relief, the wetland vegetation is extremely sensitive to small topographic variations and therefore provides a window into the micro-topography. Here, the AA. use knowledge of the relation between local relief and vegetation in order to generate a micro
The AA. present an alternative approach for generating micro-topography for the wetlands of the Okavango Delta. The region is characterized by extremely low local relief, with a maximum relief of no more than 2 to 3 m. Notwithstanding this low
Biogenic action;Biogenic process ; Crystalline rocks ; Vegetation ; Weathering
Evidence is presented suggesting that micro-vegetation, notably lichens, substantially influences the weathering of the material on which it grows. Changes on two rock types are examined in order to assess the role of lichens in the mechanical
Soils of a dune coastal salt marsh system in relation to groundwater level, micro-topography and vegetation under a semiarid Mediterranean climate in SE Spain
Domaine méditerranéen ; Dune ; Ecosystème ; Espagne ; Littoral ; Marais salant ; Milieu humide ; Murcia ; Niveau marin ; Propriétés du sol ; Sol ; Végétation
Domaine semi-aride ; Espagne ; Formation herbacée ; Modèle ; Mouvement de masse ; Splash ; Versant ; Végétation
Grassland ; Mass movement ; Model ; Semi-arid area ; Slope ; Spain ; Splash ; Vegetation
The morphology, and architecture of the tussocks of alpha grass as well as its associated micro topography have been described in several sites on the south versant of the Filabres Range, in southern Spain. The results show the formation of micro
topographic mounds upslope of the tussocks which are interpreted as deposition bodies originating from the interception of downslope sediment movement by the vegetated patches. A simple simulation model has been built from the field observations.
The influence of micro-climate, snow cover, and soil moisture on ecosystem functioning in high mountains
The dynamics of water and energy fluxes in the high mountains of central Norway was studied along micro-spatial topographic gradients in different altitudes and regions of the Scandes. Landscape ecological processes like snow accumulation during
winter, snow melting, evaporation, percolation, soil moisture variability and temperature variations were quantified. Combining spatio-temporal data on physical environment functioning and vegetation patterns resulted in a process-oriented
Evaluates potential of measuring/mapping forest decline in spruce-fir forest using TM simulator data. TMS ratios of 1.65/1.23 and 1.65/0.83 micro-m bands are found to be strongly correlated with ground-based measurements of forest damage. Ratio
colour density slice images using these band ratios and images using 0.56 micro-m and 1.65 micro-m bands provide means of detecting, quantifying and mapping levels of forest decline. - (CB)
This report reviews climatological literature for 2001. Most of the material cited is micro- and mesoscale, with some excursions into regional scales where those studies employ the concepts and methods characteristic of smaller scale approaches
. The emphases chosen for this year's review are exchanges of carbon dioxide, water vapour and other trace gases between the Earth's surface and the atmosphere (especially for vegetation canopies) and the microclimatic processes and microclimates of snow- and ice
Ecuador ; Geochemistry ; Heavy metals ; Human impact ; Quito ; Residential area ; Trace-element ; Tree ; Urban park ; Vegetation
Transformation de la composition en micro-éléments de la végétation arbustive. Différences d'espèces dans l'accumulation des éléments parles plantes arbustives. Etat de la végétation arbustive dans les conditions de différentes actions anthropiques.
Complex multi-layer vegetation map as the basis for detailed geobotanical regionalization and characterization of the spatial structure of landscape (a case study from the Vistula River Valley, Poland)
Vegetation maps as a tool in environmental assessment and spatial planning
Biodiversité ; Carte de la végétation ; Habitat ; Paysage ; Pologne ; Unité paysagique ; Utilisation du sol ; Vallée ; Végétation ; Wisła
Biodiversity ; Habitat ; Land use ; Landscape ; Landscape unit ; Poland ; Valley ; Vegetation ; Vegetation map ; Wisła
This paper links vegetational microlandscapes distinguished on the basis of differentiation of actual vegetation with geobotanical sub-districts defined on the basis of differentiation of potential vegetation. For each of these microlandscapes
an actual and potential vegetation, as well as land-use were analyzed; the analysis being performed for an area of ca. 540 km2 of the Vistula River valley. The spatial structure of these microlandscapes was characterized in terms of various landscape metrics
. The analysis reveals that comprehensive treatment allows micro-landscapes to be aggregated into typological (and potentially regional) units of a higher rank.
Data on Holocene vegetation in the Atlantic Sahara in Palaeoecology of Africa and the surrounding islands-Vol 13.
Afrique ; Géographie de l'Afrique ; Holocène ; Paléobiogéographie ; Quaternaire zone chaude ; Sahara ; Sahara Atlantique ; Végétation
Macro and micro botanical remains point to a Holocene environment of open grass and Chenopodiaceae vegetation, with varied herbs and some shrubs. The plant cover could have been somewhat denser than nowadays to explain the geomorphological
, palaeontological and archaeological context at the same period. However the data show no qualitative latitudinal change in vegetation during the last 40,000 years.
Association végétale ; Biogéographie ; Ecosystème ; Flore ; Gphy ; Géographie physique ; Hokkaido ; Iburi ; Japon ; Marécage ; Milieu humide ; Phytosociologie ; Synécologie descriptive ; Taxonomie ; Végétation ; Yûfutsu Mire
Etude de la végétation des marécages du Yûfutsu (Japon) et de la distribution des communautés végétales, contrôlée par le micro-relief, les fluctuations saisonnières du niveau de l'eau, et les sols.