Effects of vegetation on soil slippage by pore pressure modification
California ; Dynamique de versant ; Eau du sol ; Etats-Unis ; Géographie physique ; Mouvement de masse ; Transverse Ranges ; Versant ; Végétation
Influences of vegetation on shallow (< 1 m) soil slip formation through modification of soil water is investigated on hillslides covered by verdant chaparral (dense shrubland), and burned vegetation in the Transverse Ranges of California
. The results contradict the common assumption that depletion of soil water by vegetation would result in slower saturation rates and hence greater resistance of a soil mass to slippage.
The late Wisconsin and early Holocene vegetation is discussed after a brief overview of the modern vegetation. Three site-specific midden records receive detailed study : two lie at 930-940 m elevation and currently support thermophilous desertscrub
The aims of this study are : 1) to evaluate quantitatively the extent to which European pollen spectra for the last 13,000 years represent vegetation units lacking modern analogs| 2) to map the location and extent of no-analog vegetation
at millenial intervals| and 3) to display the patterns, extent, and rates of change of pollen spectra, and hence, by inference, of vegetation and macroclimate, in Europe during the last 13,000 years. The degree of analogy between fossil and contemporary pollen
Contribution to the study of marine flora and vegetation of N Sporades Islands (Kira Panagia and Piperi), Aegean Sea, Greece
Algue ; Ecologie appliquée ; Environnement ; Flore marine ; Grèce ; Géographie physique ; Ile ; Mer Egée ; Méditerranée ; Protection de la nature ; Voriai Sporadhes ; Végétation
The present contribution has a main goal to describe the marine flora and vegetation of some small rocky isles Nof Alonissos, N Sporades. The research took place in different biotopes at depths ranging from 0-8-10 m in ordre to create a marine park
Bibliographie ; Dynamique de la végétation ; Ecosystème ; Forêt ; Forêt tropicale ; Géographie physique ; Hydrologie ; Microclimat ; Zone intertropicale
The following review (1987-1989) covers seven areas of study : microclimate, climate and vegetation change| hydrology| mineral nutrition| forest structure| forest regeneration| herbivory| conservation.
La valoracion del estado y dinamismo del paisaje vegetal à traves de las comunidades y asociaciones que lo integran Evaluation de l'état et du dynamisme du paysage végétal par l'étude des communautés et des associations qui le comparent
Biogéographie ; Dynamique de la végétation ; Ecologie du paysage ; Espagne ; Géographie physique ; Madrid région ; Méthodologie ; Phytogéographie ; Végétation
Questions méthodologiques concernant l'étude géographique de la végétation et les problèmes de sa dégradation. Quelques exemples des environs de Madrid. - (CAM)
To evaluate the relative roles of climate, vegetation, and base level change on the development of the Buchanan Drainage, this study utilizes a well-dated alluvial chronology and reconstructs vegetation within the watershed based on the nearly (20
Carte thématique ; Gel ; Glaciation ; Géographie physique ; Géomorphologie climatique ; Limite de la forêt ; Monde ; Montagne ; Permafrost ; Précipitation ; Température ; Végétation ; Zonation ; Zonation altitudinale ; Zone climatique
of timberline and the number and character of altitudinal vegetation zones are useful criteria, as are the amount and seasonality of moisture available to vegetation and to physiographic processes, including past and present glaciation. The circumstances under
Vegetation change caused by land-use intensification - Examples from the Hilly Country of Saxony in The eastern part of Germany.
; Terre arable ; Utilisation du sol ; Végétation
Etude des changements du paysage, en particulier de la végétation, résultat d'une utilisation du sol de plus en plus intensive. Mise en évidence d'une très importante réduction des biocénoses et des paysages. Conclusion sur la nécessité d'une
This pollen analysis provides the first Holocene vegetational history for the Kanuti Flats of north-central Alaska. Basal samples contain a curious and unusual combination of tundra and boreal taxa. This pattern suggests that the Holocene history
Rol' vodnoj erozii v reakcii rastitel'nosti na izmenenija klimata Rôle de l'érosion hydrique dans la réaction de la végétation aux variations du climat
Etude expérimentale du ruissellement sur des sols à végétation contrastée du Mont Lozère
Erosion des sols ; France ; Géographie physique ; Infiltration ; Massif Central ; Mont Lozère ; Précipitation ; Ruissellement ; Simulateur de pluie ; Sol ; Versant ; Végétation
The A. presents the results of pollen analysis of the cover beds of a marine terrace at the Ohawe Beach Section. The site provides a long vegetational and climatic history covering one climatic cycle from periods previously undocumented for New
Ecosystème ; Géographie physique ; Littoral ; Marais littoral ; Milieu humide ; Niveau marin ; Variation climatique ; Végétation
. Despite increased international efforts to clarify the response of sea level to future climatic change, predictions of the effect on coastal marshes still requires further understanding of local subsidence, sediment supply and vegetation factors.
The factors discussed are vegetation cover, soil surface roughness, rainfall amount and intensity, the morphology of the eroded field, soil type, crop type and how the land was worked by the farmer. Some geomorphological impacts are then described