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PORTAIL D'INFORMATION GÉOGRAPHIQUE

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  • This paper seeks to understand the relationship between air temperature change and annual stem recruitment of the Betula ermanii population at the local scale in the upper treeline, based on data between 1953 and 2008 from field observations, tree
  • -ring analysis, and meteorological station records, and using statistical analysis and mathematical simulation. Different propagation forms and annual stem recruitment of the Betula ermanii population responded significantly to the increase of air
  • temperature. Under global warming, the population expansion and the domain enlargement of Betula ermanii led to a treeline shift. The population has continued to vary its physiological traits to adapt to air temperature change.
  • 2011
  • show a high variability of annual gully retreat rates both between gullies and between observation periods. The varying influences of land use and human activities on runoff production and connectivity play a dominant role in these study areas, both
  • 2011
  • The AA. analyze variation in soil moisture, water availability for plants, and drying processes on the hillslopes, and relationships between these factors and the annual variability of vegetation cover. The results show that clay content is a key
  • factor defining the limit of water availability in the soil (the wilting point). Significant differences between soil moisture/available water and vegetation cover were observed, defining a positive feedback process that varied in nature along
  • 2011
  • A simulation-based study of geographically weighted regression as a method for investigating spatially varying relationships
  • Il s'agit d'estimer la capacité de la méthode à distinguer entre un processus constant dans l'espace et un autre processus avec des relations spatiales susceptibles de varier, et d'autre part de rendre fidèlement de telles relations. Des situations
  • 2011
  • On the time-varying trend in global-mean surface temperature
  • 2011
  • complexes, based on ceramics and metalware trades, sit alongside agricultural systems embracing both arable and grassland specialisms. These varied landscapes are both products and reflections of many histories. This atlas includes an array of specially
  • -drawn, full-colour maps covering themes as varied as natural resources, administration, and various aspects of the socio-economic development of the county up to the mid-20th century. Each spread of maps is accompanied by an explanatory text
  • 2011
  • Modelling time varying scouring at bed sills
  • A modelling approach is presented to predict local scour under time varying flow conditions. The model is based on a number of hypotheses concerning the characteristics of the flow hydrograph, the temporal evolution of the scour and the geometry
  • 2011
  • Michael Williams was an historical geographer, who worked on a variety of themes in England, Australia, and the USA, and on a global scale. Wetland drainage, settlement creation, and the varied fortunes of forests formed major aspects of his work
  • 2011
  • In this paper, results of the Giri and Shimizu (2006) model are compared with laboratory data on bedform response to time-varying flows that produce changes in bedform morphology without total removal (so-called washout) of bedforms. The goal
  • of the research presented herein is to assess this method for making predictions of bedform behavior in time-varying flows and to try to identify aspects of the problem that need further research to develop this and similar methods into practical predictive tools
  • 2011
  • Spatially varying relationships of new firm formation in the United States
  • 2011
  • vary for a number of reasons. Studies of rock mulch soils indicate enhanced fertility, with elevated organic carbon, nitrogen, and available phosphorus levels, increased infiltration rates and moisture retention, and no evidence of compaction
  • . By contrast, cultivation effects vary widely for terraced soils. Although numerous studies have focused on irrigation canals, irrigated soils have received far less attention. Soil studies of irrigation systems along the Gila and Santa Cruz rivers of Arizona
  • 2011
  • L'introduction de l'irrigation par la Révolution Verte a partout accru les précipitations de saison sèche ou, à tout le moins, en a ralenti la baisse. L'ampleur du phénomène varie d'une région à l'autre, mais on relève localement des augmentations
  • 2011
  • Entre 1918 et 2006, les températures minimales journalières ont plus évolué à la hausse que les maximales. Mais si la tendance est souvent uniforme sur toute la Californie pour les minima, elle varie énormément dans le temps comme dans l'espace pour
  • 2011
  • The impact of fiscal decentralization on U.S. county population, employment, and real income growth is analyzed. The findings suggest that government organization matters for local economic growth, but that the impacts vary by government unit
  • 2011
  • are more important than the distance-decay parameter. The spatial scale of input data is more important than model parameters. More attention needs to be given to the varying spatial structures of population between places and incorporating this information
  • 2011
  • Examen des similarités des origines géographiques des partenaires dans le choix des conjoints aux Pays-Bas. L'usure de la distance est un critère très pertinent. Le niveau d'homogamie spatiale non seulement varie en fonction des caractéristiques
  • 2011
  • of the Smithsonian Institution and the expansive space of the North American West produced science and framed geographical understanding. In this era, science varied in its constitution and reputation in relation to place and personnel, in its nature by virtue of its
  • 2011
  • De 1960 à 2008, la température a augmenté de plus de 1°C, tandis que les précipitations ont en moyenne baissé de 5,5 mm par an. La perception de cette évolution du climat varie selon le sexe, l'âge et surtout la catégorie socio-culturelle. Il en va
  • 2011
  • This paper focuses on the elemental chemistry of sediments at 2 archaeology sites, Chunchucmil, Mexico, and Kinet, Turkey. The aim of this study is to understand how certain elements correlate with each other and vary by space and time at different
  • of a site, and if so, is this in a systematic way or does it vary geographically? And, are these chemical signatures of human activity hidden or highlighted by different ICP methods? The analyses revealed detectable differences between natural
  • 2011
  • , and Technology (STIRPAT) model. The distribution pattern of ecological footprint and the degree of sustainable development varied distinctly from city to city in YDR. In 2008, the highest values of ecological footprint and the lowest one of sustainable
  • 2011