This paper shortly summarises the results of a study undertaken in Senegal. It is a part of a larger project, aiming at describing the general vegetation types in Senegal.
Biogéographie ; Phénologie ; Saisonnalité ; Végétation ; Zone intertropicale
Biogeography ; Phenology ; Seasonality ; Tropical zone ; Vegetation
Expression de la saisonnalité de la végétation tropicale. Revue des facteurs physiques responsables. Observation des floraisons, fructifications, croissance saisonnière du diamètre (anneaux de croissance), etc.. Méthodes de mesure. Diagramme
Non-classificatory analysis and representation of heathland vegetation from remotely sensed imagery
Cartographie thématique ; Ecologie ; Lande ; Royaume-Uni ; Traitement des données ; Télédétection ; Végétation
Data processing ; Ecology ; Heathland ; Remote sensing ; Thematic mapping;Thematic cartography ; United Kingdom ; Vegetation
This paper discusses the representation of semi-natural vegetation, drawing on examples of heathland vegetation that lie along continua. Tow alternative approaches to the representation of heathland vegetation are examined, both of which aim
to model the continuous character of the vegetation with measures of the strength of class membership to « discrete classes », namely probabilities of class membership from a maximum likelihood classification and fuzzy membership functions from the fuzzy c
A new detailed pollen record from the Semaforo section (the lower part of the Crotone series) is presented here and used to reconstruct the southern Italian paleoenvironments at a mountain site where various vegetation types may coexist in different
altitude ranges. This record documents the dynamics of the vegetation at the beginnning of the Northern Hemisphere glaciations and rapid vegetation replacements related to climate. The vegetation history is then compared to global climatic changes expressed
The presented method of evaluating transformations in vegetational landscapes is based on the concept of rings of successor communities. This serves in the drawing up of the map of anthropogenic transformations of Poland's vegetational landscapes
segregated along gradients of elevation and soil composition. They study establishment at a specific time and place in order to capture the relation between a particular flood stage and a vegetation pattern. They reason that if site-specific features cannot
Des sols devenus plus sableux retiennent l'eau plus efficacement et le retour des pluies, après une période sèche, peut paradoxalement provoquer une reprise spectaculaire de la végétation (alfa, remt) sur ces sables. L'impact de l'ensablement n'est
Revue des articles concernant le rôle protecteur de la végétation éparse contre l'érosion des sols liée au vent, en particulier dans les régions arides.―(CL)
Biogeography ; Ecology ; Floodplain ; Forest ; Iowa ; Meander ; United States ; Vegetation ; Vegetation dynamics
To examine specific changes in vegetation initiated by the lateral migration of a river channel, the AA. quantify the structures and composition of woody trees and shrubs along a cutbank forest edge in an Iowa floodplain.
Vegetation survey on Mount Trus Madi, Borneo - a prospective new mountain park
Biogéographie ; Gestion des ressources ; Malaisie ; Montagne ; Protection de l'environnement ; Protection de la nature ; Sabah ; Végétation
Biogeography ; Environmental conservation ; Malaysia ; Mountain ; Nature conservation ; Resource management ; Sabah ; Vegetation
Description of the vegetation of this mountain in the State of Sabah (Bornean Malaysia), delineating three zones between 1 500 and 2 642 m above sea level. Logging is the major threat to this forest; protection as a preserve is urged.―(DWG)
The AA. present a model to explain the pattern of Holocene vegetational changes in the Rocky Mountains. The model is based on the understanding of : 1) the vegetational and climatic history of the Yellowstone region and the northern Rocky Mountains
Annual variation ; Arizona ; Climatology ; Drought ; Global change ; Moisture ; Potential evapotranspiration ; Precipitation ; Rocky Mountains ; Twentieth Century ; United States of America ; Vegetation
Studying a century of rainfall records, the AA. find no conclusive evidence that periods of precipitation abundance or deficiency could have been responsible for vegetation change in southeastern Arizona during that period. - (DWG)
Spatial heterogeneity of high mountain vegetation in the Andean desert zone of Chile
Andes ; Chili ; Haute montagne ; Montagne ; Phytogéographie ; Végétation ; Zonation altitudinale
Altitudinal zonation ; Andes ; Chile ; High mountain ; Mountain ; Phytogeography ; Vegetation
Three vegetation belts between 3 200 and 4 450 m are distinguished within which there are other differences as well : shrubs on north-facing slopes; perennial herbs on south-facing slopes; leguminous species on calcium-rich soils. At the same
Etudes de la végétation quaternaire au Portugal ; environnement, bilan des résultats, perspectives
Palynologie ; Paléo-environnement ; Portugal ; Quaternaire ; Végétation
Palaeo-environment ; Palynology ; Portugal ; Quaternary ; Vegetation
Etat des connaissances et présentation des lignes de recherches actuelles sur la végétation quaternaire au Portugal. Evolution de la végétation durant les derniers 55 000 ans. - (DBF)
Archaeology ; Brittany ; Climatic variation ; France ; Human impact ; Land clearing ; Palaeogeography ; Vegetation
Récapitulatif des connaissances sur l'évolution de la végétation armoricaine au cours des dix derniers millénaires, montrant que la pression humaine a été déterminante dans le façonnage des paysages actuels. - (BH)
Pollen evidence from Lake Shayema, Mianning County, was obtained to examine postglacial vegetation and climatic change in southwestern Sichuan. The pollen record displays several changes in the vegetation over the last 11 000 yr. Except
for increased disturbance starting ca. 1 000 yr B.P., the predominance of sclerophyllous vegetation continued until today. The pollen results are compatible with proposed global circulation hypotheses of a strengthened monsoon system during the early to mid
The ecosystematical evaluation of different units of landscapes and the distributional pattern of floristical groups and different ecosystems is represented in Ecological Maps with vegetation units. Species diversity, the abundance of species