Vegetationdynamics during the late Pleistocene in the Barreirinhas region, Maranhão State, northeastern Brazil, based on carbon isotopes in soil organic matter
Analyse isotopique ; Brésil ; Carbone ; Charbon de bois ; Dynamique delavégétation ; Maranhâo ; Matière organique ; Paléobiogéographie ; Pléistocène ; Propriétés du sol ; Quaternaire ; Sol
km of the transect. Soil profiles in this transect were sampled for δ13 C analysis, as well as buried charcoal fragments were used for 14 C dating. The vegetationdynamic inferred in this study for northeastern Brazil is in agreement with the results
A vegetation transect of 78 km was studied among 4 vegetation types : Restinga (coastal vegetation), Cerrado (woody savanna), Cerradão (dense woody savanna), and Forest, as well as three forested sites around Lagoa do Caçó, located approximately 10
The interactions between all neighbouring organisms : The roles of Charles Darwin, Ernst Haeckel and Eugenius Warming in the evolution of ideas on plant dynamics
Bibliografía ; Biogeografía ; Concepto ; Dinámica dela vegetación ; Ecología ; Europa ; Siglo 19 ; Siglo 20 ; Sucesión vegetal ; Teoría ; Vegetación
Bibliography ; Biogeography ; Concept ; Ecology ; Europe ; Nineteenth Century ; Plant succession ; Theory ; Twentieth Century ; Vegetation ; Vegetationdynamics
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
to the understanding of change and interrelationship evolved from von Humboldt (1807) to Haeckel (1866) who stressed the interaction between organisms, as did Darwin. However, it was Eugenius Warming, together with Buffon, Biberg and Dureau dela Malle, who played
the key roles in developing the foundation for the theories of plant dynamics upon which later ecologists built.
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
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 lavégétation naturelle et l'agression que celle-là constitue pour la stabilité de l'écosystème. Des observations de longue durée
donnent également des résultats importants pour l'étude des paysages sur les successions végétales.
Description physiographique dela zone sud-est de Málaga. Etude delavégétation potentielle et tentative d'une approche pour une dynamique delavégétation. - (AAG)
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
Etude des facteurs en jeu dans la dynamique delavégétation selon les échelles spatio-temporelles. La notion d'échelle est déterminante dans l'appréciation de l'évolution et dela dynamique des espèces et des communautés, et les données empiriques
fournies par la paléo-écologie doivent être prises en compte dans l'élaboration de modèles de prévision. (CM).
Biogeography ; Colorado ; Ecosystem ; Flood ; Model ; Stream ; United States of America ; Vegetation ; Vegetationdynamics
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
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.
Arizona ; Channel geometry ; Ecosystem ; Flood ; Multivariate analysis ; Riparian vegetation ; Spatial distribution ; Statistics ; Stream ; United States of America ; Vegetationdynamics
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.
Bosque ; China ; Clima ; Cobertura vegetal ; Correlación ; Dinámica dela vegetación ; Espacio-tiempo ; Formación herbácea ; Precipitación ; Temperatura ; Vegetación ; Índice de vegetación
China ; Climate ; Correlation ; Forest ; Grassland ; Inner Mongolia ; Plant cover ; Precipitation ; Space time ; Temperature ; Vegetation ; Vegetationdynamics ; Vegetation index
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.
Carbon sequestration, vegetationdynamics and soil development in the Boreal Transition ecoregion of Saskatchewan during the Holocene
Canada ; Charbon de bois ; Dynamique delavégétation ; 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.
Un indice global devégétation hebdomadaire a été tiré des données AVHRR de NOAA (1982 à 1985) de l'Asie comprenant aussi bien les zones désertiques d'Asie centrale que la forêt tropicale de Bornéo. Montre que l'on obtient d'utiles informations sur
la dynamique des écosystèmes et les pratiques culturales. Montre aussi les répercussions de l'oscillation vers le S. de l'El Nino en 1982-1983, la sécheresse et les anomalies végétales qui en découlent. - (CB)
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 delavégétation (alfa, remt) sur ces sables. L'impact de l'ensablement n'est
Au cours de l'assèchement de marécages saumâtres d'arrière-mangrove, deux voies évolutives delavégétation semblent possibles, aboutissant chacune à un fourré de terre ferme : l'une liée à des apports sableux éoliens; l'autre sur sol frais à