inscription
PORTAIL D'INFORMATION GÉOGRAPHIQUE

Résultats de la recherche (192 résultats)

Affinez votre recherche

Par Collection Par Auteur Par Date Par Sujet Par Titre
  • Spatio-temporal dynamics of vegetation coverage and its relationship with climate factors in Inner Mongolia, China
  • 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
  • China ; Climate ; Correlation ; Forest ; Grassland ; Inner Mongolia ; Plant cover ; Precipitation ; Space time ; Temperature ; Vegetation ; Vegetation dynamics ; Vegetation index
  • 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.
  • 2013
  • Species origins, dispersal, and island vegetation dynamics in the South Pacific
  • Biodiversité ; Biogéographie ; Biote ; Dynamique de la végétation ; Espèce végétale ; Flore ; Géologie ; Habitat ; Ile ; Tonga ; Végétation
  • Biodiversity ; Biogeography ; Biota ; Flora ; Geology ; Habitat ; Island ; Plant species ; Tonga ; Vegetation ; Vegetation dynamics
  • Biodiversidad ; Biogeografía ; Biota ; Dinámica de la vegetación ; Especie vegetal ; Flora ; Geología ; Hábitat ; Isla ; Tonga ; Vegetación
  • This article analyses species origins, dispersal, and island vegetation dynamics of the Kingdom of Tonga in the South Pacific. It demonstrates that species–area relationships are significant for all plant species and for ancient and modern
  • archipelagos of Samoa and Fiji. It concludes that plant dispersal spectra vary significantly according to island topography, geology,vegetation types, and plant species origins.
  • 2013
  • Vegetation greenness modeling in response to climate change for Northeast Thailand
  • Années 1980-2009 ; Biogéographie ; Changement climatique ; Dynamique de la végétation ; Image satellite ; Impact ; Indice de végétation ; Modèle ; Précipitation ; Série chronologique ; Température ; Thailande du Nord-Est ; Thaïlande ; Télédétection
  • ; Variabilité climatique ; Végétation
  • Biogeography ; Climatic change ; Climatic variability ; Impact ; Model ; Northeast Thailand ; Precipitation ; Remote sensing ; Satellite imagery ; Temperature ; Thailand ; Time series ; Vegetation ; Vegetation dynamics ; Vegetation index
  • The AA. investigated the seasonal variation of vegetation greenness based on the Normalized Difference Vegetation Index (NDVI) in the region. NDVI data were collected from year 2001 to 2009 using multi-temporal Terra MODIS Vegetation Indices Product
  • (MOD13Q1). NDVI profiles were developed to measure vegetation dynamics and variation according to land cover types. Meteorological information for a 30 year time span from 1980 to 2009 was analyzed for their patterns. Furthermore, the data taken from
  • and evergreen forests. The highest productivity and biomass were observed in dry evergreen forests and the lowest in paddy fields. A vegetation greenness model was developed from correlations between NDVI and meteorological data using linear regression
  • . The model could be used to observe the change in vegetation greenness and dynamics affected by temperature and rainfall.
  • 2013
  • Variation in vegetation greenness in spring across eastern China during 1982–2006
  • Années 1982-2006 ; Chine ; Chine de l'Est ; Dynamique de la végétation ; Indice de végétation ; Printemps ; Précipitation ; Température ; Végétation
  • China ; Eastern China ; Precipitation ; Spring (season) ; Temperature ; Vegetation ; Vegetation dynamics ; Vegetation index
  • Vegetation greenness is a key indicator of terrestrial vegetation activity. To understand the variation in vegetation activity in spring across eastern China (EC), the AA. analysed the variation in the Normalised Difference Vegetation Index (NDVI
  • 2013
  • Vegetation distribution pattern along altitudinal gradient in subtropical mountainous and hilly river basin, China
  • Analyse de régression ; Bassin-versant ; Chine ; Distribution spatiale ; Etagement de la végétation ; Fujian ; Image satellite ; Indice de végétation ; Montagne ; Télédétection ; Végétation ; Zone subtropicale
  • Altitudinal zonation of vegetation ; China ; Fujian ; Mountain ; Regression analysis ; Remote sensing ; Satellite imagery ; Spatial distribution ; Subtropical zone ; Vegetation ; Vegetation index ; Watershed
  • This paper aims to investigate the non-stationary relationship between vegetation distribution pattern and topographic and climate conditions in a moist sub-tropical rainforest of Minjiang River Basin in Fujian Province. The HJ-1 satellite image
  • acquired on December 9, 2010 was utilized and NDVI index was calculated representing the range of vegetation greenness. Proper analysis units were achieved through segregation based on small sub-basins and altitudinal bands. Results indicated
  • that the geographic weighted regression (GWR) model was more powerful than ordinary linear least square (OLS) regression in interpreting vegetation-environmental relationship. This paper confirmed that the non-stationary analysis through the framework of GWR could
  • lead to a better understanding of vegetation distribution in subtropical mountainous and hilly region.
  • 2013
  • Urban vegetation cover and vegetation change in Accra, Ghana : connection to housing quality
  • Accra ; Analyse de variance ; Carte de la végétation ; Couverture végétale ; Distribution spatiale ; Espace urbain ; Ghana ; Indice de végétation ; Logement ; Qualité du logement ; Quartier ; Végétation
  • Analysis of variance ; Ghana ; Housing ; Neighbourhood ; Plant cover ; Spatial distribution ; Urban area ; Vegetation ; Vegetation index ; Vegetation map
  • Análisis de varianza ; Barrio ; Cobertura vegetal ; Distribución espacial ; Espacio urbano ; Ghana ; Mapa de la vegetación ; Vegetación ; Vivienda ; Índice de vegetación
  • Les AA. analysent la distribution spatiale et la transformation du couvert végétal à Accra, au Ghana entre 2002 et 2010. Dans un premier temps, ils quantifient et cartographient son évolution en se basant sur l’indice de végétation, ce qui leur
  • 2013
  • Response of vegetation restoration to climate change and human activities in Shaanxi-Gansu-Ningxia Region
  • Action anthropique ; Années 2000-2009 ; Changement climatique ; Chine ; Développement durable ; Espace-temps ; Gansu ; Gestion de l'environnement ; Indice de végétation ; Ningxia ; Restauration écologique ; Shaanxi ; Végétation
  • China ; Climatic change ; Ecological restoration ; Environmental management ; Gansu ; Human impact ; Ningxia ; Shaanxi ; Space time ; Sustainable development ; Vegetation ; Vegetation index
  • In order to monitor the vegetation variations and clarify the causes of rehabilitation in the Shaanxi-Gansu-Ningxia Region, this paper, based on the MODIS-NDVI and climate data during the period of 2000–2009, analyzes the main characteristics
  • , spatial-temporal distribution and reasons of vegetation restoration, using methods of linear regression, the Hurst Exponent, standard deviation and other methods. From 2000 to 2009, the NDVI of the study area was improved progressively, with a linear
  • tendency. The vegetation restoration is characterized by 2 fast-growing periods, with an S-shaped increasing curve. Climate change and human activities are 2 driving forces in vegetation restoration; moreover anthropogenic factors such as Grain for Green
  • Project were the main causes leading to an increasing trend of NDVI on local scale. The Hurst Exponent of NDVI time series shows that the vegetation restoration was sustainable.
  • 2013
  • Soil erosion and its response to the changes of precipitation and vegetation cover on the Loess Plateau
  • Années 2000-2010 ; Chine ; Couverture végétale ; Erosion des sols ; Erosion hydrique ; Espace-temps ; Indice de végétation ; Loess Plateau ; Précipitation ; Restauration écologique ; Végétation
  • China ; Ecological restoration ; Plant cover ; Precipitation ; Soil erosion ; Space time ; Vegetation ; Vegetation index ; Water erosion
  • China ; Cobertura vegetal ; Erosión de los suelos ; Erosión hídrica ; Espacio-tiempo ; Precipitación ; Restauración ecológica ; Vegetación ; Índice de vegetación
  • The vegetation restoration named Grain-to-Green Program has now been operating for more than 10 years on the Loess Plateau. It is therefore necessary to assess the variation of soil erosion and the response of precipitation and vegetation
  • restoration to soil erosion in this region. The Revised Universal Soil Loss Equation (RUSLE) was applied to evaluate annual soil loss caused by water erosion. The results are presented. Benefited from the improved vegetation cover and ecological construction
  • . The variation of vegetation cover responding to soil erosion in these areas showed the relatively higher contribution than the precipitation. However, most areas in Qingyang and Dingxi prefectures in Gansu Province and Guyuan in Ningxia Hui Autonomous Region
  • 2013
  • Changes in the extent of non-forest woody vegetation in the Novodvorsko and Žehušicko region (Central Bohemia, Czech Republic)
  • Action anthropique ; Agroforesterie ; Dynamique de la végétation ; Dynamique du paysage ; Paysage ; Paysage agricole ; Structure du paysage ; Středočeský ; Tchèque république ; Unité paysagique ; Végétation
  • Agricultural landscape ; Agroforestry ; Czech Republic ; Human impact ; Landscape ; Landscape dynamics ; Landscape structure ; Landscape unit ; Středočeský ; Vegetation ; Vegetation dynamics
  • Changes in the extent and occurrence of non-forest woody vegetation in the agricultural landscape of the Novodvorsko and Žehušicko region in the Central Bohemia during the last 60 years are presented in the paper. The extent and changes of non
  • forest woody vegetation were observed in natural (biochores) and cultural (landscape character areas) units with the aim to find out differences dependent on natural and cultural conditions. Results confirm that the quantity as well as the distribution
  • of elements of non-forest woody vegetation changed during the last 60 years in an important way. Significant decrease in the area of non-forest woody vegetation and extinction of many important biotopes are among the main results of the work. - (EN)
  • 2013
  • Drought and spring cooling induced recent decrease in vegetation growth in Inner Asia
  • Asie ; Asie centrale ; Changement climatique ; Croissance végétative ; Impact ; Indice de végétation ; Sécheresse ; Végétation
  • Asia ; Central Asia ; Climatic change ; Drought ; Impact ; Vegetation ; Vegetation index
  • 2013
  • Do changes in vegetation quality precede urban sprawl ?
  • Analyse spatiale ; Athínai ; Densité urbaine ; Domaine méditerranéen ; Dynamique de la végétation ; Etalement urbain ; Méditerranéens, pays ; Qualité environnementale ; Roma ; Utilisation du sol ; Ville ; Végétation
  • Athens ; Environmental quality ; Land use ; Mediterranean States ; Mediterranean area ; Rome ; Spatial analysis ; Town ; Urban density ; Urban sprawl ; Vegetation ; Vegetation dynamics
  • On compare les tendances observées concernant la qualité de la végétation, période 1975-2000 à Athènes et à Rome avec la distribution et la densité des espaces urbains en 2010. On teste si l'étalement urbain a été précédé par des changements dans
  • les caractéristiques du paysage. L'expansion de ces villes n'a guère été réglementée, et leurs formes urbaines diffèrent. Les changements dans la qualité de la végétation sont corrélés avec le type de développement urbain autour de ces villes. Les
  • tendances de la qualité de la végétation pourraient être un indicateur indirect de l'étalement urbain dans le domaine méditerranéen.
  • 2013
  • The use of dynamic global vegetation models for simulating hydrology and the potential integration of satellite observations
  • Bassin-versant ; Biogéographie ; Changement climatique ; Changement global ; Cycle de l'eau ; Dynamique de la végétation ; Ecoulement ; Hydrologie ; Impact ; Incertitude ; Modèle ; Simulation ; Télédétection ; Végétation
  • Biogeography ; Climatic change ; Global change ; Hydrology ; Impact ; Model ; Remote sensing ; Runoff ; Simulation ; Uncertainty ; Vegetation ; Vegetation dynamics ; Water cycle ; Watershed
  • Dynamic global vegetation models (DGVMs )are discussed and comparisons of model inputs and formulations are made among and between DGVMs and global hydrological models. It is shown that the configuration of process representations and data inputs
  • are what makes a given DGVM unique within the family of vegetation models. The variety of available climatic forcing datasets introduces uncertainty into simulations of hydrological variables. It is proposed that satellite-derived data, validated thoroughly
  • 2013
  • Bio-geomorphic effects on tidal channel evolution : impact of vegetation establishment and tidal prism change
  • ; Végétation ; Zone intertidale
  • Aerial photography ; Biogeomorphology ; Channel geometry ; Coastal environment ; Coastal sedimentation ; Estuary ; Europe ; Intertidal zone ; Northwestern Europe ; Photointerpretation ; Plant colonization ; Tidal marsh ; Time series ; Vegetation
  • Colonización vegetal ; Estuario ; Europa ; Europa del Noroeste ; Fotografía aérea ; Fotointerpretación ; Geometria hidráulica ; Litoral ; Marisma litoral ; Sedimentación litoral ; Serie cronológica ; Vegetación ; Zona intertidal
  • density and channel width) change as (1) vegetation establishes on an initially bare intertidal platform and (2) sediment accretion on the intertidal platform leads to a reduction in the tidal prism (i.e. water volume that during a tidal cycle floods
  • flat towards a high-elevated vegetated marsh. They found that vegetation establishment causes a marked increase in channel drainage density.
  • 2013
  • Vegetation dynamics on eroding to accreting beach-foredune systems, Florida panhandle
  • Accumulation littorale ; Biodiversité ; Dune ; Dynamique de la végétation ; Erosion ; Etats-Unis ; Florida ; Géomorphodynamique ; Littoral ; Vitesse d'érosion ; Végétation
  • Biodiversity ; Coastal deposit ; Coastal environment ; Dune ; Earth surface processes ; Erosion ; Erosion rate ; Florida ; United States of America ; Vegetation ; Vegetation dynamics
  • Vegetation surveys were conducted on a variety of coastal foredunes in a largely natural region along the Gulf County region of the Florida panhandle. Species presence, absence and percentage cover were surveyed on 12 foredune profiles during
  • different seasons. The vegetation data were analyzed using the Shannon–Wiener Diversity Index and Sørensen Index. Uniola sp. and Andropgon sp. were the dominant species on foredunes. It is highlighted that the observations of foredune species richness
  • 2013
  • Arbre ; Dynamique de la végétation ; Etats-Unis ; Forêt ; Modèle ; Modèle logit ; Occupation du sol ; Peuplement forestier ; Végétation
  • Forest ; Forest stand ; Land utilisation ; Logit model ; Model ; Tree ; United States of America ; Vegetation ; Vegetation dynamics
  • On reconstitue la végétation forestière des Etats-Unis avant le peuplement européen, à une résolution spatiale plus fine que celle qui est disponible sur la base des Public Land Surveys. L'application du modèle proposé est illustrée par les trois
  • 2013
  • Thirty years of studies on badlands, from physical to vegetational approaches. A succinct review
  • Années 1995-2012 ; Badland ; Bibliographie ; Erosion des sols ; Lithologie ; Modèle ; Propriétés du sol ; Restauration écologique ; Vitesse d'érosion ; Végétation
  • Badland ; Bibliography ; Ecological restoration ; Erosion rate ; Lithology ; Model ; Soil erosion ; Soil properties ; Vegetation
  • Vegetation was not a subject of research in early papers, which contrasts with the present situation when about 40% of papers published in international journals about badlands address some aspect of vegetation. However, the growth in the attention
  • paid to vegetation and erosion rates was not linked to any increase in papers dealing with badland reclamation. Badlands are now seen as a group of systems with some common features but diverse dynamics, depending mainly on climatic and lithological
  • 2013
  • Soil erosion and surface runoff on different vegetation covers and slope gradients : A field experiment in Southern Shaanxi Province, China
  • Acción antrópica ; Aprovechamiento agrícola del suelo ; Chensi ; China ; Cobertura vegetal ; Desmonte ; Erosión de los suelos ; Erosión hídrica ; Inclinación de la vertiente ; Parcela experimental ; Propiedades del suelo
  • A field experiment in the Shangnan County using small erosion plots was carried out to determine and compare the soil loss and surface runoff from 5 vegetation covers and 3 levels of slope gradient. The 5 vegetation covers embraced the most frequent
  • , and forestlands including low and high forests (Chinese cork-oak coppices and pine plantations, respectively). The change in the runoff among the vegetation covers and slope gradients was high but not as significantly pronounced as for the change in the soil loss
  • . Results showed that the slope gradient has an impact on the runoff and soil loss. In addition, results exhibited that the rate of erosion is substantially affected by changes in vegetation cover.
  • 2013
  • Cartographie thématique ; Distribution spatiale ; Espèce invasive ; Etats-Unis ; Image satellite ; Indice de végétation ; Tamaris ; Texas ; Télédétection ; Végétation ; Végétation ripicole
  • Invasive species ; Remote sensing ; Riparian vegetation ; Satellite imagery ; Spatial distribution ; Texas ; Thematic mapping ; United States of America ; Vegetation ; Vegetation index
  • Les AA. proposent d’intégrer une imagerie multi-temporelle et multi-résolution permettant de cartographier et de distinguer les tamaris des autres types de végétation ripicole dans le bassin du Rio Grande au Texas. Les résultats montrent que
  • 2013
  • Classification des éboulis en fonction des caractéristiques de la végétation
  • Alpes ; Biogéographie ; Classification ; Dynamique de versant ; Eboulis ; Etagement de la végétation ; Montagne ; Mouvement de masse ; Slovénie
  • Alps (The) ; Altitudinal zonation of vegetation ; Biogeography ; Classification ; Mass movement ; Mountain ; Slide rocks ; Slope dynamics ; Slovenia
  • 2013
  • The recurring cycles of biancana badlands : Erosion, vegetation and human impact
  • Badland ; Cycle d'érosion ; Domaine méditerranéen ; Dynamique de la végétation ; Erosion des sols ; Erosion hydrique ; Italie ; Lutte contre l'érosion ; Propriétés du sol ; Ruissellement ; Suffosion ; Toscana ; Utilisation du sol ; Végétation
  • Badland ; Erosion control ; Erosion cycle ; Italy ; Land use ; Mediterranean area ; Piping ; Rill wash ; Soil erosion ; Soil properties ; Toscana ; Vegetation ; Vegetation dynamics ; Water erosion
  • The aim of this paper is to explore the direction and rate of change in land use of the biancana badland landscapes over the last 50 years, evaluating the erosion-vegetation dynamics and examining the processes involved in 2 biancana badlands
  • was applied on selected plots of a plant dataset to distinguish vegetation types and identify the indicator species of each different type. They then evaluated soil erodibility on the eroded biancana surfaces, regosols and well-developed vertisols. The AA. aim
  • 2013