Academic literature on the topic 'Foret dense tropicale'
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Journal articles on the topic "Foret dense tropicale"
Karsenty, Alain. "Is sustainable logging possible in Africa’s dense forest?" BOIS & FORETS DES TROPIQUES 336 (September 6, 2018): 3. http://dx.doi.org/10.19182/bft2018.336.a31615.
Full textCatinot, René, and Ilona Bossanyi. "Tropical silviculture in dense African forest (Part 5)." BOIS & FORETS DES TROPIQUES 336 (September 6, 2018): 55. http://dx.doi.org/10.19182/bft2018.336.a31614.
Full textEstève, Jean. "DESTRUCTION OF FOREST AREAS AS A RESULT OF LOGGING AND HARVESTING IN AFRICAN OR AMERICAN DENSE TROPICAL RAINFORESTS." BOIS & FORETS DES TROPIQUES 328, no. 328 (July 20, 2017): 5. http://dx.doi.org/10.19182/bft2016.328.a31298.
Full textCatinot, René, and Ilona Bossanyi. "Tropicale silviculture in dense African forest (Part 1)." BOIS & FORETS DES TROPIQUES 336 (September 6, 2018): 7. http://dx.doi.org/10.19182/bft2018.336.a31602.
Full textCatinot, René, and Ilona Bossanyi. "Tropical silviculture in dense African forest (Part 3)." BOIS & FORETS DES TROPIQUES 336 (September 6, 2018): 31. http://dx.doi.org/10.19182/bft2018.336.a31612.
Full textCatinot, René, and Ilona Bossanyi. "Tropical silviculture in dense African forest (Part 4)." BOIS & FORETS DES TROPIQUES 336 (September 6, 2018): 43. http://dx.doi.org/10.19182/bft2018.336.a31613.
Full textEl Moussawi, Ibrahim, Dinh Ho Tong Minh, Nicolas Baghdadi, Chadi Abdallah, Jalal Jomaah, Olivier Strauss, and Marco Lavalle. "L-Band UAVSAR Tomographic Imaging in Dense Forests: Gabon Forests." Remote Sensing 11, no. 5 (February 26, 2019): 475. http://dx.doi.org/10.3390/rs11050475.
Full textSolberg, Svein, Endre Hofstad Hansen, Terje Gobakken, Erik Næssset, and Eliakimu Zahabu. "Biomass and InSAR height relationship in a dense tropical forest." Remote Sensing of Environment 192 (April 2017): 166–75. http://dx.doi.org/10.1016/j.rse.2017.02.010.
Full textLaybros, Anthony, Mélaine Aubry-Kientz, Jean-Baptiste Féret, Caroline Bedeau, Olivier Brunaux, Géraldine Derroire, and Grégoire Vincent. "Quantitative Airborne Inventories in Dense Tropical Forest Using Imaging Spectroscopy." Remote Sensing 12, no. 10 (May 15, 2020): 1577. http://dx.doi.org/10.3390/rs12101577.
Full textZhang, He, Marijn Bauters, Pascal Boeckx, and Kristof Van Oost. "Mapping Canopy Heights in Dense Tropical Forests Using Low-Cost UAV-Derived Photogrammetric Point Clouds and Machine Learning Approaches." Remote Sensing 13, no. 18 (September 20, 2021): 3777. http://dx.doi.org/10.3390/rs13183777.
Full textDissertations / Theses on the topic "Foret dense tropicale"
Fabing, Aline. "Bilan spatial et structurel de la degradation forestiere dans une zone de forte croissance urbaine. Le modele de pointe-noire et de sa region. Apport de l'approche regionale a la gestion durable des forets dans les pays en developpement." Université Louis Pasteur (Strasbourg) (1971-2008), 2001. http://www.theses.fr/2001STR1GE01.
Full textPicard, Nicolas. "Passage d'un modele individuel a un modele de distribution de la dynamique forestiere. Application a une foret dense tropicale humide de guyane francaise." Paris, ENGREF, 1999. https://tel.archives-ouvertes.fr/tel-00145095.
Full textLatansio, Sabrina Costa Ribeiro 1982. "Economia do nitrogênio em árvores tropicais." [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/315317.
Full textTese (doutorado) - Universidade Estadual de Campinas, Instituto de Biologia
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Doutorado
Biologia Vegetal
Doutora em Biologia Vegetal
Alexandre, Daniel-Yves. "Aspects de la régénération naturelle en forêt dense de Côte-d'Ivoire." Paris 11, 1988. http://www.theses.fr/1988PA112397.
Full textEcological cycle of three canopy forming species are described from Ivory Coast. They exemplify three different strategies or groups which encompass most of the largest trees. These are the pioneer or belukar strategy of which Trema guineensis is the type, the large wind-born group with khaya ivorensis as an example and shade forest species group with Turraeanthus africana. The seed ecophysiology is what distinguishes those groups at first step. Seeds of Trema exhibit a photoblastic dormancy and are very long lived. Seeds of Khaya can endure high evaporative conditions and the dry seed stay alive for a rather long time, meanwhile Turraenthus seed is very rapidly destroyed by dessication and cannot stay alive without ongoing germination. All the other traits of these species are linked with seed type, mainly: dispersal, growth rate, longevity, height, etc. All this canopy species highly benefit from high light level and need gaps to reach maturity. That is why gaps are so important for their succession, and their reproduction can be described as triggered by the cover opening. Past story and surrounding vegetation determine available species for regeneration. This floristical potential can be divided into three main classes: vegetative potential, seed bank, and dispersal potential. As a rule of thumb, they exhibit the same order of priority in their expression. Each potential has to exist, resist and be stimulated to get in the run till the opening space is saturated back. Identity between strategies and potentials, to say shade species and vegetative potential, pioneer and seed bank, large wind-born species and dispersal potential is demonstrated and used to predict natural regeneration after different degrees of perturbations. Some examples of application are given and some stumbling points are discussed
Viecili, Renata Rodrigues Fernandez. "Caracterização silvigênica de um trecho de floresta Ombrófila densa do parque estadual Carlos Botelho, Sete Barras - SP." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/91/91131/tde-15052013-085234/.
Full textThis study aimed to realize the silvigenic characterization of a Dense Rain Forest in according to the establishment of possible relationships between spatial changing\'s on the silvatic standards and some abiotic factors, such as soil and topography. The method applied was the inventory line interception, identifying the ecounits described by Torquebiau (1986). There were set parallel lines in every 10 meters. All dominant trees (the highest in that point), whose horizontal canopy projections intercepted the inventory line, were sampled in the silvigenic characterization. To measure the canopy projection, there were used at least four points on the inventory line as an orthogonal axis system (X and Y coordinates). Each sampled tree was classified based on its architecture features as: trees of the future, trees of the present or trees of the past (OLDEMAN, 1987). The gap surface crossing inventory lines were also measured and mapped. The ecounit establishment is created by the connection of canopies from the same category (future, present or past). The ecounits design were mapped and its surface measured using the TNTmips software, based on all canopies coordinates over the inventory lines. The study resulted in the graphic representation of vegetation coverage and its correlation with abiotic factors. To evaluate the contribution of the abiotic factors on the vegetation mosaic`s spatial composition, a Geographic Information System (GIS) was settled to combine and analyze all data. Different information classes were overlapped as layers on the GIS environment. According to the results it`s possible to conclude that silvigenic characterization indicates that the studied area represents a pre mature forest, based on recent disturbances sings, confirmed on high rates of ecounits as 1A or reorganization types. It is concluded that the silvigenic mapping represented the architectural behavior of the species related to the soil classification.
Gourlet-Fleury, Sylvie. "Modélisation individuelle spatialement explicite de la dynamique d'un peuplement de forêt dense tropicale humide (dispositif de Paracou - Guyane française)." Phd thesis, Université Claude Bernard - Lyon I, 1997. http://tel.archives-ouvertes.fr/tel-00204403.
Full textLe modèle de croissance est dérivé d'un type « potentiel x réducteur » adapté aux spécifités de la forêt dense tropicale humide de Guyane. Il prédit l'accroissement d'un arbre en fonction de son diamètre à l'instant t et de son environnement immédiat décrit par deux indices de compétition : l'un rend compte de la pression subie par l'arbre en début de période de croissance et l'autre de l'évolution de cette pression dans un passé proche. La prise en compte de quinze groupes d'espèces, homogènes du point de vue de la croissance, améliore considérablement son efficacité. Quatre modèles de mortalité prédisent la mort sur pied et la mort par chablis primaire, secondaire ou complexe d'un arbre, et un modèle de recrutement permet de gérer l'apparition de nouveaux individus sur des placeaux de 100m2 en fonction de la place disponible dans le peuplement.
Le simulateur, programmé en langage SmallTalk-80 selon la technique des systèmes multi-agents, est doté d'une interface conviviale permettant à l'utilisateur : (i) de suivre l'évolution virtuelle dans le temps d'un peuplement et de chacun des individus qui le constituent par le biais de cartes et de graphiques ; (ii) de réaliser à tout moment une gamme très variée d'interventions de manière à tester des scénarios sylvicoles. Les différents essais réalisés montrent que le peuplement que nous avons généré présente un comportement satisfaisant quelle que soit l'intensité des perturbations imposées, mais que sa réactivité est faible au regard d'un modèle matriciel calibré à partir des mêmes données. Nous proposons différentes voies d'amélioration et soulignons l'intérêt que peut présenter ce type de modèle pour la communauté scientifique et, à plus long terme, le gestionnaire forestier.
Pelissier, Raphaël. "Relations entre l'hétérogénéité spatiale et la dynamique de renouvellement d'une forêt dense humide sempervirente (Forêt d'Uppangala - Ghâts occidentaux de l'Inde)." Phd thesis, Université Claude Bernard - Lyon I, 1995. http://tel.archives-ouvertes.fr/tel-00488916.
Full textNgueguim, Jules Romain. "Productivité et diversité floristique des ligneux en forêt dense d'Afrique tropicale humide du Cameroun : sites de Mangombé, Bidou et Campo." Paris, Muséum national d'histoire naturelle, 2013. http://www.theses.fr/2013MNHN0019.
Full textThis study is carried in rainforest of Cameroon. It presents: i) the adaptability of species, planted with two sylviculturals methods in Mangombe’s plantation and ii) compare the biodiversity of Mangombe’s forest to those of Bidou and Campo less disturbed. The adapted species with few mortality and best diameter increasement are : Gmelina arborea (Verbenaceae), Dipterocarpus alatus (Dipterocarpaceae) and Aucoumea klaineana (Burseraceae). The natural regeneration under canopy in plantation is heterogenic and diversed. The vegetation indices show a high diversity in all the sites : Shannon index, generic diversity and specific richness which is higher in Mangombe (38 families and 91 species), intermediary in Bidou (32 families and 88 species) and lower in Campo (29 families and 75 species). Zoochory concerns more than 71% of the species, and suggests a major role of animals in the regeneration process. The abondance of species familiar to non disturbed natural forest confirms the possibility for the natural regeneration to reconstitute in long term the biodiversity in plantation
Cordeiro, Lorenza Zanetti Silva. "Tratamento silvicultural de desbaste de liberação em uma floresta ombrófila densa no estado de Roraima." Universidade Federal de Roraima, 2012. http://www.bdtd.ufrr.br/tde_busca/arquivo.php?codArquivo=378.
Full textNeste estudo foram avaliadas a eficiência técnica e os custos da aplicação do tratamento silvicultural de desbaste de liberação seletivo, com anelamento e aplicação de herbicida (Tordon, 50% de diluição), em uma Floresta Ombrófila Densa no Estado de Roraima, manejada de acordo com os preceitos de exploração de impac o reduzido e legislação vigente. Para analisar o efeito das características das árvores na desvitalização, foi ajustado o modelo logístico binário, indicando uma menor velocidade de desvitalização para espécies secundárias. Foram aneladas 21,6 arv/ha para favorecer a liberação de 12 arv/ha, em uma relação de 1,8 competidores para cada Árvore Comercial potencial para Colheita Futura (ACCF) liberada. O resultado da aplicação do tratamento silvicultural demonstrou uma boa efetividade da técnica, alcançando 100% de mortalidade das árvores competidoras no período de 12 meses após o anelamento, com 69% das árvores desvitalizadas dentro do período de 6 meses. O custo por hectare atingiu valor total de R$ 77,88/ha, sendo o custo por árvore anelada de R$ 3,59 e o custo por árvore liberada de R$ 5,56. Ao analisar a distribuição dos custos, observou-se que 50% deveu-se ao insumo (no caso específico a aquisição do herbicida), 47% decorreu do custo da mão de obra, 2% deveu-se à aquisição de equipamento de proteção individual e 1% de materiais. O rendimento operacional alcançou 0,76 homem/dia.ha-1, abrangendo as atividades de localização das ACCF, identificação das competidoras, corte de cipós, anelamento e aplicação de herbicida.
This study presents the results of the analysis of technical efficiency and costs of silvicultural treatments carried out in a lowland Amazon rainforest logged under reduced impact logging guidelines. The silvicultural treatments consisted in the postharvest girdling and herbicide treatment (using the product Tordon in 50% solution) of remnant trees competing with future crop trees (FCTs). In order to analyze the effect of girdling on tree mortality, a binary logistic model was utilized. The model indicated a slower mortality process for secondary tree species. On average 21,6 competing trees per hectare were girdled in order to benefit 12 FCTs per hectare (on average 1,8 competitors for every FCT). Results demonstrate the high efficiency of the silvicultural treatments tested: mortality of competitors attained 69% within six months after girdling and 100% within twelve months after girdling. The total cost of girdling amounted to BRL 77,88 per ha, BRL 3,59 per girdled tree and BRL 5,56 per FCT. Of the total cost, 50% arose from production factors, especially herbicide acquisition, while 47% were labor costs. Only 2% of the total costs were generated from work safety equipment and 1% of other materials. The operative productivity attained 0,76 man days per hectare which included the activities competitor identification, climber cutting, girdling and herbicide application.
Senterre, Bruno. "Recherches méthodologiques pour la typologie de la végétation et la phytogéographie des forêts denses d'Afrique tropicale." Doctoral thesis, Universite Libre de Bruxelles, 2005. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210954.
Full textII. Field data consisted in phytosociological homogeneous sample plots localized within different recognized phytogeographical entities, in a region of tropical Africa where these entities are known to be well conserved. A total of 37 such plots were inventoried in the region extending from the littoral forests of Ndoté, Equatorial Guinea, which are wet evergreen forests, to the continental forests of the Dja, Cameroon, known as evergreen seasonal forests. The studied region also included the oriental Atlantic forests of Equatorial Guinea, known as moist evergreen forests or caesalp forests. In various parts of this continentality gradient, some plots were localized within climax non-zonal formations, namely the submontane rain forests. The emphasis was put on the vegetation of the Monte Alén National Park.
The sampling methodology was willing to be as "complete ", including all strata, "quantitative ", enumerating all individuals, and "representative ", within each stratum, as possible. These multi-layers plots were realised using nested sub-plots, with a sampling size of 100 individuals for every ligneous stratum recognized (dominant trees, dominated trees and shrubs) and a sampling size of 200m² for the herbaceous and suffrutex stratum.
Forest types were defined independently for each stratum and the differences were analysed. A method was proposed for the simultaneous analysis of all floristic data, converting and standardizing the values from ligneous strata, on the one hand, and from understorey strata, on the other hand.
III. Ten forest types were described using IndVal and discussed in the general context of the guineo-congolian region, from a syntaxonomic view point (agglomerative classification) and from a phytogeographical view point (divisive classification). Homologies between these two approaches are described. The proposed phytogeographical system is based on an "open " conception of hierarchical classifications, combining advantages of agglomerative and divisive classifications. In concrete terms, the non-zonal criteria, for example the submontane variants, are categorised separately and in analogy with the zonal criteria, related to the usual phytochoria.
Analysis of ecological relationships for the 10 communities showed that the main variables related to the floristic variability in our mainland rain forests are elevation, rainfall, hygrometry (estimated using bryophytes cover levels) and distance to the ocean. The two extremes on the vertical microclimatic gradient, dominant trees stratum and herbaceous stratum, give similar typologies, however canonical analysis showed that for the herbaceous layer, non-zonal variables (hygrometry and elevation) were gaining more importance when the influence of the two zonal variables was attenuated. In every case, spatial autocorrelation was less important than the environment in explaining floristic variability but its role increased in the spatial arrangement of understorey species, whose dispersal capacity is generally lower than canopy trees. The phytosociological, phytogeographical and ecological description of forest types is accompanied by a physiognomical description using biological types spectrum, as well as architectural models, leaf sizes, etc.
With regard to diversity, we have demonstrated that species richness was higher from upper to lower strata because of the accumulation in lower strata of species from various strata. On the other hand, the proper stratum diversity, i.e. the structural set, decreased from dominant trees to shrubs. The proper diversity of the herb layer showed relatively high figures mainly due to the higher individual density in relation to the existence of microstrata. Within the 37 sample plots, 1,050 taxa have been identified to species or morpho-species levels, for a total of 25,750 individuals. These taxa represent 442 genus among 104 families. The richest forest type is found on the foothills of the Niefang range, on the windward side. This forest type is also characterised by a high number of oligotypic genus and by species belonging to functional types indicators of glacial refuges. These functional types are defined on the basis of the dispersal capacity and on kind of stand needed for effective germination. We formulated the hypothesis that this kind of "foothills refuge ", characterised by his zonal nature, could have been one of the rare refuges for species from mainland rain forests, while montane and fluvial refuges would mainly have preserved species from non-zonal forest types: (sub)montane and riverine.
Based on indicator species of submontane forests, a potential distribution map of this forest type has been realised at the Atlantic central African scale. More than 400 submontane forest localities have been mapped. These forests begin at 400m of altitude near the ocean, and progressively at higher altitude for increasing distance to the ocean. Many lowland localities also comprised submontane species, which could indicate the existence of ecological transgressions. These transgressions would allow migratory tracks for submontane species between isolated mountain ranges, not only during glacial periods, through heights at the northern and southern borders of the congo basin, but also contemporarily through the lowland riverine forest network, in the centre of this basin. Finally, a special attention has been attributed to littoral forests and to some cases of choroecological transgressions, coupled to the ecological equalization phenomenon.
Doctorat en sciences agronomiques et ingénierie biologique
info:eu-repo/semantics/nonPublished
Book chapters on the topic "Foret dense tropicale"
Pradhan, Biswajeet, and Suzana Binti Abu Bakar. "Debris Flow Source Identification in Tropical Dense Forest Using Airborne Laser Scanning Data and Flow-R Model." In Laser Scanning Applications in Landslide Assessment, 85–112. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-55342-9_5.
Full textRoberts, Patrick. "Introducing Tropical Forests in Prehistory, History, and Modernity." In Tropical Forests in Prehistory, History, and Modernity. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198818496.003.0005.
Full textRoberts, Patrick. "The Last in a Long Line Historical and Ethnographic Tropical Forest Encounters." In Tropical Forests in Prehistory, History, and Modernity. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198818496.003.0011.
Full textFurley, Peter A. "Tropical Forests of the Lowlands." In The Physical Geography of South America. Oxford University Press, 2007. http://dx.doi.org/10.1093/oso/9780195313413.003.0017.
Full textRoberts, Patrick. "‘Ruins’ of the Forest Social Complexity and Tropical Cities." In Tropical Forests in Prehistory, History, and Modernity. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198818496.003.0010.
Full textLauenroth, William K., and Ingrid C. Burke. "The Shortgrass Steppe: The Region and Research Sites." In Ecology of the Shortgrass Steppe. Oxford University Press, 2008. http://dx.doi.org/10.1093/oso/9780195135824.003.0005.
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