Letteratura scientifica selezionata sul tema "Forêts mélangées"
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Articoli di riviste sul tema "Forêts mélangées":
Perot, Thomas, e Patrick Vallet. "Des forêts mélangées, une stratégie pour produire du bois face aux enjeux énergétiques et climatiques ?" Sciences Eaux & Territoires Cahier spécial, n. II (2012): 6. http://dx.doi.org/10.3917/set.hs03.006.
Thiffault, Nelson, Patricia Raymond, Jean-Martin Lussier, Isabelle Aubin, Samuel Royer-Tardif, Anthony W. D’Amato, Frédérik Doyon et al. "Sylviculture d’adaptation aux changements climatiques : des concepts à la réalité Compte-rendu d’un colloque tenu au Carrefour Forêts 2019". Forestry Chronicle 97, n. 01 (gennaio 2021): 28–42. http://dx.doi.org/10.5558/tfc2021-005.
LANIER, L. "La forêt doit-elle être mélangée ?" Revue Forestière Française, n. 2 (1992): 105. http://dx.doi.org/10.4267/2042/26305.
César, Jean, Jérémy Bouyer, Laurent Granjon, Massouroudini Akoudjin, Laure Guerrini e Dominique Louppe. "Les relictes forestières de la falaise de Banfora : un peuplement original au voisinage de Bobo-Dioulasso, Burkina Faso". BOIS & FORETS DES TROPIQUES 305, n. 305 (1 settembre 2010): 43. http://dx.doi.org/10.19182/bft2010.305.a20437.
Moos, Christine, e Roland Métral. "La sécheresse croissante met-elle en danger l’effet protecteur de la forêt?" Schweizerische Zeitschrift fur Forstwesen 173, n. 4 (1 luglio 2022): 178–83. http://dx.doi.org/10.3188/szf.2022.0178.
Burton, Justin C., Jason M. Amundson, Ryan Cassotto, Chin-Chang Kuo e Michael Dennin. "Quantifying flow and stress in ice mélange, the world’s largest granular material". Proceedings of the National Academy of Sciences 115, n. 20 (30 aprile 2018): 5105–10. http://dx.doi.org/10.1073/pnas.1715136115.
Jactel, Hervé, e Lorenzo Marini. "Libre évolution des forêts et maîtrise du risque sanitaire associé aux scolytes des conifères". Revue forestière française 73, n. 2-3 (30 marzo 2022): 383–90. http://dx.doi.org/10.20870/revforfr.2021.5477.
Junod, Pascal. "Forêt finement mélangée, une réalité à promouvoir | Finely mixed forest, an asset to be encouraged". Schweizerische Zeitschrift fur Forstwesen 162, n. 3 (1 marzo 2011): 51–58. http://dx.doi.org/10.3188/szf.2011.0051.
Ewetola, I. A., R. S. Onabanjo, N. P. Francis e G. S. Ojewola. "Influence of wilting period on mineral contents of grass-legume silage mixtures in Umudike, South East, Nigeria". Nigerian Journal of Animal Production 49, n. 5 (26 maggio 2023): 15–23. http://dx.doi.org/10.51791/njap.v49i5.3759.
Grégoire, Olivier, Denis Souffland, Serge Gauthier e Roland Schiestel. "Vers une modélisation multiéchelle des mélanges turbulents compressibles en présence de forts gradients de masse volumique". Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy 325, n. 11 (dicembre 1997): 631–34. http://dx.doi.org/10.1016/s1251-8069(99)80061-x.
Tesi sul tema "Forêts mélangées":
Bernard, Marianne. "Changements climatiques et herbivorie : influence sur la régénération et le potentiel d'avenir des forêts mélangées". Thesis, Montpellier, 2018. http://www.theses.fr/2018MONTG052/document.
There is growing concern about the future of temperate mountainous forests, because of climate change and of the difficulties in regenerating forests caused by large ungulates pressure. Herbivore ungulate populations have strongly increased since the middle of the XXth century in the northern hemisphere. By their selective browsing due to their dietary preferences, they exert a strong pressure on regeneration, which intensity on each tree species varies with their palatability. The response of regeneration to climate change in terms of growth and survival is still poorly known, but some results suggest it could be affected differentially given the different autecologies of the species. In such a global changes context, mixed forests are considered a valuable option of adaptation. How would the regeneration phase respond to those two pressures, and what could be the future of a mixed stand in such a context? This study focuses on the effects of browsing by large ungulates and climate change on mixed silver fir, Norway spruce and beech stand regeneration. We show that the lower amount of light reaching the ground in mixed stands does not affect beech regeneration germinating. We demonstrate a quasi-substitution of silver fir by Norway spruce saplings when submitted to high browsing pressure. At the finer scale of foliar traits, we find different responses among the three species to varying climate and browsing pressure, silver fir being the only species expressing an answer to browsing (increase in shoot mechanical resistance and in foliar C:N). Our results also demonstrate a decrease in browsing with increasing winter temperature, and a stronger effect of browsing than of spring temperature on saplings growth for silver fir, beech and sycamore maple. Finally, our simulations of the dynamics of a mixed silver fir-Norway spruce-beech stand suggest a shift in tolerance to drought thresholds due to browsing, and confirm the possible eradication of silver fir in scenarios combining browsing and climate change. This work highlights the influence of large ungulates interacting with climate conditions on forest regeneration dynamics, and the importance to consider this pressure in research protocols aiming at studying the behaviour of regeneration in changing climate contexts
Toïgo, Maude. "Productivité des forêts mélangées : effet de la diversité en essences dans un contexte climatique et édaphique variable". Thesis, Orléans, 2015. http://www.theses.fr/2015ORLE2018.
Global environmental changes may lead to a modification of abiotic factors and biological diversity. The production function in forest ecosystems has the particularity to be both subjected to, and a regulator of, these environmental changes. Understanding how forest productivity is driven by species diversity and environmental factors is therefore a critical issue. This PhD thesis studies how tree species mixture affects their productivity along edaphic and climatic gradients. Based on an approach using both an original dataset and the national forest inventory dataset, I focused on five major species of European forests in pure and two-species forests: Quercus petraea, Pinus sylvestris, Fagus sylvatica, Abies alba and Picea abies. In lowlands, abiotic factors had little impacts on the outcome of tree species mixture on productivity. In addition, the effect of tree species mixture was determined by the shade tolerance of companion species. In highlands, the positive effects of tree species mixture were strongest when the abiotic factors were the most limiting for growth. These results highlight the importance of considering abiotic factors and the functional characteristics of species as drivers of the effect of biological diversity on ecosystem functions
Martin-Blangy, Soline. "Interactions des espèces d’arbres en peuplements mélangés : effets sur la réponse à la sécheresse des arbres et rôle des mécanismes de partage des ressources en eau et en lumière". Electronic Thesis or Diss., Université de Lorraine, 2021. http://www.theses.fr/2021LORR0214.
Biodiversity, through tree species interactions, can support many ecosystem functions and services in forest ecosystems. However, in the current context of climate change, the influence of these interactions on the response of forest ecosystems to extreme climatic events, such as drought, is still under debate. Moreover, evidence for the underlying above-ground and below-ground interaction mechanisms that can explain these relationships between diversity and forest ecosystem functioning is still rare.The first objective of my thesis work was to determine the effect of tree species interactions in mixed stands on tree water relations and drought response. My second objective was to identify below-ground or above-ground mechanisms related to resource partitioning that could explain mixture effects on functioning, such as depth of water uptake by roots or canopy space filling by tree crowns.This work was carried out, within the framework of the ANR DiPTICC project, in two distinct experimental systems: an observational network in mature natural forests in the south-east of France (GMAP) and a young experimental plantation near Bordeaux (ORPHEE). I worked on three types of two-species mixtures: beech (Fagus sylvatica) - fir (Abies alba) and beech - downy oak (Quercus pubescens) along the GMAP network and birch (Betula pendula) - maritime pine (Pinus pinaster) at ORPHEE. My work is based on an empirical approach, with ecophysiological and light interception measurements, under contrasting conditions of soil water availability. Functions such as transpiration or water use efficiency (estimated by measuring carbon isotopic composition) were studied.My work shows that in young and old stands, the water relations and drought response of the species studied are little impacted by species interactions. Differences among species in water extraction depths, when present, did not necessarily result in higher water availability for species in mixed stands under drought conditions. Contrary to hypotheses often made in the literature, this suggests that belowground mechanisms would seldom drive the effects of species interactions. In contrast, I observed that the mechanisms of crown complementarity generated changes in stand structure and light interception and appeared to have a strong impact on the functioning of mixed stands.My work confirms that, for the same combination of tree species, the species-mixing effects on tree functioning are highly dependent on local environmental conditions. It is therefore essential for forest managers to take these local conditions into account when making choices about the species composition of future forests. Overall, we found no negative mixture effects on water relations, suggesting that managing forests in favor of mixed stands remains an interesting option for managers to maintain many other forest ecosystem functions and services under climate change
Perot, Thomas. "Quel est le niveau de détail pertinent pour modéliser la croissance d'une forêt mélangée ? Comparaison d'une famille de modèles et application aux peuplements mélangés chêne sessile - pin sylvestre". Paris, AgroParisTech, 2009. http://tel.archives-ouvertes.fr/docs/00/43/25/73/PDF/ManuscritTheseTPerotVF.pdf.
Appropriate tools and models are needed for the management of mixed forests. The aim of this thesis is to show how the construction and the comparison of models with different levels of detail can help us to choose the most appropriate level to model the growth of a mixed stand. We developed a family of models at different levels of detail from data collected in mixed stands of sessile oak (Quercus petraea L. ) and Scots pine (Pinus sylvestris L. ) : a tree distance independent model (MAID), a tree distance dependent model (MADD), three stand models and an intermediate model bridging the MAID and the MADD. We ensured consistency between models using several approaches in order to make relevant comparisons. These models have given us some knowledge on the growth and dynamics of these forests, in particular on the spatial and temporal interactions between oaks and pines. Thus, we showed a compensatory growth phenomenon between the two species using the MAID. The MADD made it possible to show that, in these stands, the intraspecific competition was stronger than interspecific competition. A stand model developed from the MADD helped us to study the influence of mixing rate on production. To assess the quality of models predictions, we used an independent data set obtained by splitting our data. For example, we have shown that the MAID was more efficient than the MADD to predict individual increments. The models were also compared on examples of applications with short or medium term simulations. The proposed approach is of interest for both understanding the studied phenomenon and developing predictive tools. The different results of this work, allowed us to assess the relevance of a type of model for different contexts of use. This very general approach could be applied to the modeling of other processes such as mortality or regeneration
Pérot, Thomas. "Quel est le niveau de détail pertinent pour modéliser la croissance d'une forêt mélangée ? Comparaison d'une famille de modèles et application aux peuplements mélangés chêne sessile - pin sylvestre". Phd thesis, AgroParisTech, 2009. http://tel.archives-ouvertes.fr/tel-00432573.
Alvarez, Eric. "Influence d'un siècle de récolte forestière sur la forêt mélangée tempérée de la Mauricie". Thesis, Université Laval, 2009. http://www.theses.ulaval.ca/2009/26252/26252.pdf.
To ensure sustainable development in a temperate mixedwood boreal forest in central Quebec (Canada), forest managers would like to measure the historical impact of harvesting on forest cover evolution at the landscape level. The main objective of this study was to document, at the landscape level, the historical effects of harvesting on forest cover evolution and wood volume. The study was mainly based on archival records, particularly AbitibiBowater inc 's archives. The objective of the first chapter of this study was to characterize the pre-industrial forest. The main natural disturbances were big fires in 1870 and 1923 and three spruce budworm epidemics in the 20th century. Whatever the scale considered in this study, the pre-industrial forest cover was mainly composed of mature or old-growth (> 100 years) and dominated by mixedwood forest stands with intolerant hardwoods. The main forest species were white birch, black spruce and jack pine, three species associated to forest succession after fire in the boreal forest. Chapter 2 had as objectives to make an historical reconstruction of forest cover evolution in 14 landscapes and to qualify the possible effects of harvesting. For the latter, we used three analytical methods in a triangulation approach. The main alteration of forest harveting on forest cover was qualified as additive to the natural dynamic, particularly considering the increase of intolerant hardwoods. The objective of chapter 3 was to make an historical reconstruction of wood harvesting in a past forest concession (Vermillon). We monitored indicators of forest sustainability in order to discuss the impacts of forest concession revocation in 1986. In the context of our study we noted an increase of wood harvesting after the revocation. Although we were unable to conclude that the new policy was a threat to wood production sustainability, on a sustainable yield basis, our security margin has surely diminished since the introduction of the policy of 1986. “To keep in mind the actions we have done and their results” should be a leitmotiv in our forest management. At least, we should record the data collected during regular operations.
Collet, Romain. "Critères de malaxabilité des mélanges granulaires humides". Thesis, Toulouse, INPT, 2010. http://www.theses.fr/2010INPT0004/document.
Mixing is an important operation in the elaboration of concrete. It creates a homogeneous distribution of solids and liquid. This work was carried out with model materials (glass beads), reference materials present in the concrete composition (calcite, cement, sand) and different liquids (water, isopropanol, glycerol). This study allowed us to optimize the mixing operation, and to clarify the difference between good and bad mixing. Moreover, the study offered informations allowing to reduce the energy consumption and the mixing time. We showed that the granular medium behaviour during the mixing (shear resistance, wetting kinetic, compacity), is affected a lot by the granular medium properties and by the mixer parameters, particularly during the “dry granular medium / wet granular medium” transitional period. A systematic study allowed us to classify these parameters among the individual powders properties (size, shape), the collective properties (packing), the wetting liquid properties (viscosity, superficial tension, liquid with an adjuvant), the liquid/solid interface properties (contact angle), and the process parameters (liquid addition method). Two complementary analysis levels were used to study the influence of these different parameters. The dynamic regime (using of a laboratory planetary mixer) allowed us to characterise the granular medium behaviour during the mixing, using the intensity consumption measure. The quasi-static regime (Schulze annular shear cell) was used in order to achieve a simplified approach to the mixing and to the local stresses (shear plan with a known surface and low velocity). This system allowed us to distinguish the frictional and cohesive interactions that take place during the mixing. In addition, the porosity of the granular medium was measured during the mixing. This porosity changes with the added liquid amount, and is partially responsible of the shear resistance modifications
Grosset, Catherine. "Identification et dosage chromatographiques de mélanges d'antioxydants : application à des formes pharmaceutiques". Université Joseph Fourier (Grenoble), 1987. http://www.theses.fr/1987GRE18011.
Brugerolle, Sophie. "Caractérisation de l'habitat du lièvre d'Amérique à différentes échelles spatiales : une étude en forêt mélangée". Thesis, Université Laval, 2004. http://www.theses.ulaval.ca/2004/21513/21513.pdf.
Piazza, Chifflet Adriana. "Modèles mathématiques pour la gestion optimale des ressources renouvelables : une application à la gestion soutenable d'une forêt mélangée". Montpellier 2, 2007. http://www.theses.fr/2007MON20095.
Libri sul tema "Forêts mélangées":
Pin, Daniel. Méthodes d'exploitation et de régénération naturelle des forêts mélangées à dominance de bouleau à papier, projet no 4057. Sainte-Foy, Qué: Service canadien des forêts, Région du Québec, 1997.
Dubois, J. J. Des milieux aux territoires forestiers: Mélanges en l'honneur de Jean-Jacques Dubois. Arras: Artois presses université, 2010.
Schütz, Jean-Philippe. Sylviculture 2 : La Gestion des forêts irrégulières et mélangées. Presses polytechniques et universitaires romandes, 1997.
Niazi, Sarfaraz K. Handbook of Preformulation: Chemical, Biological, and Botanical Drugs. Taylor & Francis Group, 2006.
Niazi, Sarfaraz K. Handbook of Preformulation: Chemical, Biological, and Botanical Drugs. Informa Healthcare, 2006.
Niazi, Sarfaraz K. Handbook of Preformulation. Taylor & Francis Group, 2019.
Niazi, Sarfaraz K. Handbook of Preformulation: Chemical, Biological, and Botanical Drugs, Second Edition. Taylor & Francis Group, 2019.
Niazi, Sarfaraz K. Handbook of Preformulation: Chemical, Biological, and Botanical Drugs, Second Edition. Taylor & Francis Group, 2019.
Niazi, Sarfaraz K. Handbook of Preformulation: Chemical, Biological, and Botanical Drugs, Second Edition. Taylor & Francis Group, 2019.
Capitoli di libri sul tema "Forêts mélangées":
Solera, Gianluca. "Migration, Nomadism, Mélange as Transformative Forces". In Citizen Activism and Mediterranean Identity, 57–82. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-45961-5_3.
Agee, James K. "Forest Mélange". In Steward's Fork, 19–30. University of California Press, 2007. http://dx.doi.org/10.1525/california/9780520251250.003.0003.
"3. Forest Mélange". In Steward's Fork, 19–30. University of California Press, 2019. http://dx.doi.org/10.1525/9780520933798-005.
Whitaker, Marie-Joséphine. "Formes et thématique du désir dans l’oeuvre de Paul Claudel". In Territoires comparatistes. Mélanges offerts à Zbigniew Naliwajek. Warsaw University Press, 2014. http://dx.doi.org/10.31338/uw.9788323528609.pp.211-224.
Halliday, Stratford, e Ian Ralston. "Major forts and ‘minor oppida’ in Scotland: a reconsideration". In L’âge du Fer en Europe. Mélanges offerts à Olivier Buchsenschutz, 219–33. Ausonius Éditions, 2024. http://dx.doi.org/10.46608/basic1.9782356134929.21.
Holden, Robert H. "Binding Hatreds: Public Violence, State, and Nation in Central American History". In Armies Without Nations, 25–49. Oxford University PressNew York, NY, 2004. http://dx.doi.org/10.1093/oso/9780195161205.003.0003.
Tétu, Jean-François. "La naissance de la mode". In Témoignage, mémoire et histoire. Mélanges offerts à Jacques Walter, 455–65. Éditions de l'Université de Lorraine, 2023. http://dx.doi.org/10.62688/edul/b9782384510207/c30.
Caillaud, Émilie, Anne Filippini e Nadine Dieudonné-Glad. "Où fabriquait-on le fer pour les forges des Princes Bituriges (VIe-Ve s. a.C.) ?" In Mines et métallurgies anciennes. Mélanges en l'honneur de Béatrice Cauuet, 85–96. Ausonius Éditions, 2023. http://dx.doi.org/10.46608/dana9.9782356135377.10.