Normalized difference vegetation index (NDVI), displayed from images at a resolution of 8 km (cloud cover effect and atmospheric variation being reduced) is plotted against time. Different cover types appear to have typical profiles linked
; Pollen ; Quaternaire zones moyennes ; Végétation ; Zone tempérée
L'A. étudie les directions de recherche, les développements récents en paléoclimatologie à partir des données polliniques (cartographie synoptique), et les travaux concernant les processus sous-jacents de la réponse de la végétation aux changements
climatiques. Il donne les controverses, les hypothèses et les nouvelles approches sur la détermination des transformations de la végétation au Quaternaire (Holocène).
Action de la végétation ; British Columbia ; Canada ; Dynamique fluviale ; Fluviatile ; Gphy ; Géographie physique ; Hydrodynamique ; Lit fluvial ; Squamish River
L'influence de la végétation sur le régime des rivières et sur la géomorphologie fluviale constitue un processus difficilement quantifiable et traitable. Exemple concret à partir du cas de la Rivière Squamish en Colombie Britannique. (ALS).
Badland ; Bassin-versant ; Dynamique de la végétation ; Erosion des sols ; Espagne ; Inventaire écologique ; Montagne ; Pyrénées ; Taxonomie ; Végétation
The study area is located in Vallcebre, in the Upper Llobregat basin, which represents a sub-Mediterranean edge of the Pyrenees. Vegetation is sparse and heterogeneous. The aim of this study was to obtain a detailed demography of the seed
remarquable sur la structure de cette végétation en favorisant la dynamique vers un état instable et dégradé de la flore où les espèces herbacées prévalent. - (M.I.).
The interactions between all neighbouring organisms : The roles of Charles Darwin, Ernst Haeckel and Eugenius Warming in the evolution of ideas on plant dynamics
Bibliography ; Biogeography ; Concept ; Ecology ; Europe ; Nineteenth Century ; Plant succession ; Theory ; Twentieth Century ; Vegetation ; Vegetationdynamics
Bibliographie ; Biogéographie ; Concept ; Dynamique de la végétation ; Ecologie ; Europe ; Siècle 19 ; Siècle 20 ; Succession végétale ; Théorie ; Végétation
Bibliografía ; Biogeografía ; Concepto ; Dinámica de la vegetación ; Ecología ; Europa ; Siglo 19 ; Siglo 20 ; Sucesión vegetal ; Teoría ; Vegetación
The roles of early European botanists in developing the concepts of plant dynamics are acknowledged in the reviews of Tansley (1947), Cowles (1911) and Coleman (1986). The shift from the study of vegetation in terms of plant distribution
the key roles in developing the foundation for the theories of plant dynamics upon which later ecologists built.
Multiple stable states and models of riparian vegetation succession on the Animas River, Colorado
Biogeography ; Colorado ; Ecosystem ; Flood ; Model ; Stream ; United States of America ; Vegetation ; Vegetationdynamics
Berge ; Biogéographie ; Colorado ; Cours d'eau ; Crue ; Dynamique de la végétation ; Ecosystème ; Etats-Unis ; Modèle ; Végétation
This paper specifically examines the process of vegetation recovery following disturbance by exceptional natural floods along a river reach that is (and has been) comparatively undisturbed by human activities. It assesses a new successional model
, a state-and-transition model, which recognizes the possibility of multiple stable states in vegetation, via an investigation of the influence of fluvial processes and landforms on variation in a mosaic of riparian vegetation patches of different ages
AVHRR ; Analyse multivariée ; Dynamique de la végétation ; Formation herbacée ; Humidité du sol ; Indice de végétation ; Mali ; NOAA ; Propriétés du sol ; SPOT ; Sahel ; Sol ; Télédétection ; Végétation
This article examines to what extent the soil actually influences the Normalised Difference Vegetation Index (NDVI) based satellite monitoring of the Sahelian grasslands. A typical Sahelian landscape in the Gourma region in Mali is chosen as a case
This paper examines the literature on research into the effects of burial by deposition of blown sand, volcanic deposits (tephra, lavas and lahars) or fluvial sediment on vegetation and the subsequent capacity of the vegetation for survival
is then demonstrated by reference to macahir sand dune stratification in the Outer Hebrides and vegetation damage and burial following proximal volcanic impacts in New Zealand.
Riparian vegetation variability along perennial streams in central Arizona
Arizona ; Channel geometry ; Ecosystem ; Flood ; Multivariate analysis ; Riparian vegetation ; Spatial distribution ; Statistics ; Stream ; United States of America ; Vegetationdynamics
Analyse multivariée ; Arizona ; Cours d'eau ; Crue ; Distribution spatiale ; Dynamique de la végétation ; Ecosystème ; Etats-Unis ; Géométrie hydraulique ; Statistique ; Végétation ripicole
This study clarifies linkages between fluvial hydrologic processes, fluvial landforms, and patterns of riparian vegetation populations by using a suite of geomorphic and hydrologic variables. 5 riparian vegetation populations were examined along 5
perennial streams in the transition zone of central Arizona. Canonical correspondance analysis (CCA) with a forward selection was used to assess quantitatively the role of stream power in riparian vegetation patterns.
Canada ; Charbon de bois ; Dynamique de la végétation ; Ecosystème ; Holocène ; Propriétés du sol ; Quaternaire ; Réchauffement climatique ; Saskatchewan ; Zone boréale ; Zone froide
The aims of this study were to 1) determine the charcoal pools in Ah horizons of the Boreal Transition ecoregion, and 2) use the charcoal data to infer vegetationdynamics and the development of Ah horizons as a function of the main parent material
types in the ecoregion (glacio-fluvial, glacio-lacustrine and glacial till). The latter objective served to provide information in regards to future vegetation shifts and ecosystem C budgets of Boreal Plain ecosystems under climatic warming. The results
suggest that fluvial sites may be the first shifting to herbaceous vegetation in the future, followed by till sites and then lacustrine sites.
Spatio-temporal dynamics of vegetation coverage and its relationship with climate factors in Inner Mongolia, China
China ; Climate ; Correlation ; Forest ; Grassland ; Inner Mongolia ; Plant cover ; Precipitation ; Space time ; Temperature ; Vegetation ; Vegetationdynamics ; Vegetation index
Années 2001-2010 ; Chine ; Climat ; Corrélation ; Couverture végétale ; Dynamique de la végétation ; Espace-temps ; Formation herbacée ; Forêt ; Indice de végétation ; Nei Menggu ; Précipitation ; Température ; Végétation
Bosque ; China ; Clima ; Cobertura vegetal ; Correlación ; Dinámica de la vegetación ; Espacio-tiempo ; Formación herbácea ; Precipitación ; Temperatura ; Vegetación ; Índice de vegetación
The vegetation coverage dynamics and its relationship with climate factors on different spatial and temporal scales in Inner Mongolia during 2001–2010 were analyzed based on MODIS-NDVI data and climate data. The results indicated that vegetation
coverage showed here obvious longitudinal zonality, increasing from west to east across the region. During 2001-2010, the mean vegetation coverage was 0.57, 0.4 and 0.16 in forest, grassland and desert biome, respectively, exhibiting evident spatial
heterogeneities. On inter-annual time scale, precipitation was the dominant driving force of vegetation coverage for the whole region. On inter-monthly scale, the change of vegetation coverage was consistent with both the change of temperature and precipitation
, implying that the vegetation growth within a year is more sensitive to the combined effects of water and heat rather than either single climate factor.
Sukzession und Natürlichkeitsgrad synanthroper Vegetation zur Kennzeichnung und Bewertung ihrer Dynamik. (Succession and naturalness grade of synanthropic vegetation for its dynamical characterization and evaluation)
Action anthropique ; Ecosystème ; Géographie physique ; Paysage ; Stabilité ; Succession végétale ; Utilisation du sol ; Végétation
Des études sur le type et l'intensité d'utilisation du sol permettent d'évaluer l'impact de l'action anthropique sur la végétation naturelle et l'agression que celle-là constitue pour la stabilité de l'écosystème. Des observations de longue durée
The effect of land cover/vegetation on soil water dynamic in the hilly area of the loess plateau, China
Chine ; Domaine semi-aride ; Eau du sol ; Erosion des sols ; Loess ; Ningxia ; Pente de versant ; Plateau ; Ressource en eau ; Sol ; Végétation
China ; Loess ; Ningxia ; Plateau ; Semi-arid area ; Slope gradient ; Soil ; Soil erosion ; Soil water ; Vegetation ; Water resources
As part of a vegetation restoration project, the AA. conducted research aiming to understand the relationship between vegetation pattern and soil water dynamics. The goal was to find vegetation types appropriate for the loess plateau with scarce
water ressources. In 1986, 15 plots of land were planted with 5 vegetation types : pine woodland, shrubland, sloping cropland, alfalfa and semi-natural grassland. Soil water content, runoff, soil erosion were measured for each plot and environmental