Search results for "Forêt"
showing 10 items of 42 documents
Vegetation structure and greenness in Central Africa from Modis multi-temporal data.
2013
African forests within the Congo Basin are generally mapped at regional scale as broad-leaved evergreen forests, with a main distinction between terra-firme and swamp forests types. At the same time, commercial forest inventories, as well as national maps, have highlighted a strong spatial heterogeneity of forest types. A detailed vegetation map generated using consistent methods is needed to inform decision makers about spatial forest organisation and theirs relationships with environmental drivers in the context of global change. We propose a multi-temporal remotely sensed data approach to characterize vegetation types using vegetation index annual profiles. The classifications identified…
Landscapes and traces of human activities preserved under forest : the forest of Val Suzon (Côte-d'Or) on long time
2021
This thesis is part of a process to improve and deepen our knowledge of the territory of Val Suzon (21), especially concerning its history. It is a matter of studying the evolution of the natural and social dynamics that shaped the forest of Val Suzon, thanks to a multidisciplinary approach focusing on biodiversity, landscape, history, archeology, etc. The subject of this thesis concerns, among other things, issues relating to natural resources available in the territory of Val Suzon as well as the management and exploitation of these resources by human communities. It also focuses on identifying the impacts of these activities on flora and fauna, examining their adaptation over time and sp…
Bias correction of dynamically downscaled precipitation to compute soil water deficit for explaining year-to-year variation of tree growth over north…
2017
This paper documents the accuracy of a post-correction method applied to precipitation regionalized by the Weather Research and Forecasting (WRF) Regional Climate Model (RCM) for improving simulated rainfall and feeding impact studies. The WRF simulation covers Burgundy (northeastern France) at a 8-km resolution and over a 20-year long period (1989–2008). Previous results show a strong deficiency of the WRF model for simulating precipitation, especially when convective processes are involved. In order to reduce such biases, a Quantile Mapping (QM) method is applied to WRF-simulated precipitation using the mesoscale atmospheric analyses system SAFRAN («Système d'Analyse Fournissant des Rense…
Les bois sacrés : Actes du Colloque International du Centre Jean Bérard, Naples 1989 / préface Olivier de Cazanove et John Scheid. - Naples : Publica…
2015
International audience
Les hêtraies du Châtillonnais (Côte-d'Or) face au changement climatique.
2013
15 pages; International audience; L'étude traite des hêtraies du Châtillonnais (Côte-d'Or, Bourgogne) face au changement climatique observé. Les données regroupent les séries bourguignonnes de température et de précipitation des stations de Météo France (1989-2009), la carte des hêtraies de l'Institut forestier national (IFN), un modèle numérique de terrain (MNT, SRTM) et quatre indices de vulnérabilité du hêtre identifiés dans la littérature. La méthode repose sur une interpolation fine (mailles de 100 m) de ces indices par régression-krigeage. Les résultats permettent de cartographier les risques actuels.
Une possible paléo-forêt du Néolithique ancien à Joze (Puy-de-Dôme)
2014
Several subfossil woods dating from the early Neolithic period were discovered in the vicinity of the Allier river alluvial terrace on the left bank of the commune of Joze. The sedimentary sequence and the chronology (radiocarbon, dendrochronology) as well as the growth of the collected wood series allow to document the evolution of the river course through flood episodes and its impact on the tree cover in the surrounding area.
Mutualistic tree-frugivore interactions in Afrotropical forests : from local ecological knowledge to the identification of network interaction patter…
2022
Frugivory in tropical forests is a major ecological process, as most tree species rely on frugivores for their dispersion, and numerous animal species used fruits as their principal sources of food. However, frugivory networks between plants and animals in Afrotropical forests are poorly described, and the mechanisms shaping them remain largely unexplored. This PhD thesis addresses a structural approach of the frugivory network, a plant-community approach and a methodological approach using local ecological knowledge and cameras.The first chapter describes the frugivory network of Afrotropical forests, based on a compilation of frugivory interactions from the literature that comprised >10,0…
Effect of inoculation with selected Bradyrhizobium spp. on the survival and growth of Acacia mangium saplings after 20 months in the field
1999
This work was designed to test the long-term effect of the inoculation of #Acacia mangium# seedlings with 10 selected strains of #Bradyrhizobium spp.#. The percentage of survival of seedlings inoculated with any of the #Bradyrhizobium# strains was increased by 10% as compared to the control plants. However, out of the 10 #Bradyrhizobium# strains tested, only 3 strains, Aust l3c, Lu 4 and Tel 8, belonging to the phylogenelic group 1, significandy enhanced the growth of #A. mangium# after 20 months in the field. For the first time, inoculation with indigenous Malaysian strains #Bradyrhizobium# such as Tel 8 and Lu 4 at the seedling stage is reported to produce enhanced and sustained growth an…
La forêt et son évolution dans le paysage francilien
2011
International audience
Robust estimation of mean electricity consumption curves by sampling for small areas in presence of missing values
2017
In this thesis, we address the problem of robust estimation of mean or total electricity consumption curves by sampling in a finite population for the entire population and for small areas. We are also interested in estimating mean curves by sampling in presence of partially missing trajectories.Indeed, many studies carried out in the French electricity company EDF, for marketing or power grid management purposes, are based on the analysis of mean or total electricity consumption curves at a fine time scale, for different groups of clients sharing some common characteristics.Because of privacy issues and financial costs, it is not possible to measure the electricity consumption curve of eac…