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Artykuły w czasopismach na temat "Sphaigne"
Francez, André-Jean. "La dynamique du carbone dans les tourbières à Sphagnum, de la sphaigne à l'effet de serre". L’Année Biologique 39, nr 4 (październik 2000): 205–70. http://dx.doi.org/10.1016/s0003-5017(00)90002-3.
Pełny tekst źródłaLortie, Guy. "Les diatomées fossiles de deux tourbières ombrotrophes du Bas-Saint-Laurent, Québec". Géographie physique et Quaternaire 37, nr 2 (29.11.2007): 159–77. http://dx.doi.org/10.7202/032512ar.
Pełny tekst źródłaHamann, Jean. "Les sphaignes de l’Est du Canada". Le Naturaliste canadien 144, nr 1 (2020): 39. http://dx.doi.org/10.7202/1068219ar.
Pełny tekst źródłaGauthier, Robert. "Les sphaignes de la vallée d’Ossau (Pyrénées-Atlantiques)". Le Journal de botanique 5, nr 1 (1998): 173–80. http://dx.doi.org/10.3406/jobot.1998.1725.
Pełny tekst źródłaDionne, Jean-Claude, i Vincent Gérardin. "Observations sur les buttes organiques de la Côte-Nord du golfe du Saint-Laurent, Québec". Géographie physique et Quaternaire 42, nr 3 (18.12.2007): 289–301. http://dx.doi.org/10.7202/032737ar.
Pełny tekst źródłaGauthier, R. "Premières observations sur les sphaignes des Alpes-de-Haute-Provence". Cryptogamie Bryologie 22, nr 2 (2001): 113–27. http://dx.doi.org/10.1016/s1290-0796(01)01057-4.
Pełny tekst źródłaDionne*, Jean-Claude, i Pierre J. H. Richard. "Origine, âge et taux d’accrétion verticale de la tourbière à palses de Blanc-Sablon, basse Côte-Nord, Golfe du Saint-Laurent, Québec". Note 60, nr 2 (10.12.2007): 199–205. http://dx.doi.org/10.7202/016829ar.
Pełny tekst źródłaHugonnot, Vincent, Pascal Royer, Chrystelle Caton, Marc Philippe, Yves Garnier i Thierry Vergne. "Les tourbières à sphaignes dans le département du Rhône (France) : inventaire et avenir". Le Journal de botanique 70, nr 1 (2015): 35–55. http://dx.doi.org/10.3406/jobot.2015.1344.
Pełny tekst źródłaRochefort, Line, i Denis F. Bastien. "Réintroduction de sphaignes dans une tourbière exploitée : Évaluation de divers moyens de protection contre la dessiccation". Écoscience 5, nr 1 (styczeń 1998): 117–27. http://dx.doi.org/10.1080/11956860.1998.11682448.
Pełny tekst źródłaSzafran, B. "Próba wyjaśnienia związku filogenetycznego między sekcjami torfowców [Un essai d'explication des relations phylogénétiques entre les sections des Sphaignes]". Acta Societatis Botanicorum Poloniae 17, nr 2 (2017): 219–37. http://dx.doi.org/10.5586/asbp.1946.009.
Pełny tekst źródłaRozprawy doktorskie na temat "Sphaigne"
Goulet, Guillaume, i Guillaume Goulet. "Système de contrôle automatisé de l'eau en culture de sphaigne". Master's thesis, Université Laval, 2019. http://hdl.handle.net/20.500.11794/37734.
Pełny tekst źródłaLa culture de sphaigne est la production durable de biomasse de sphaigne sur une base renouvelable et cyclique. Un système de contrôle de l’eau est nécessaire pour maintenir le niveau de la nappe phréatique à une valeur définie au cours de la saison de croissance dans un contexte de conditions climatiques variables. Peu d’information et de documentation sont disponibles concernant la conception et l’opération de systèmes de contrôle de l’eau dans les bassins de culture de sphaigne. Les objectifs de ce projet sont de définir, concevoir et réaliser le système de drainage et d’irrigation souterraine pour la culture de sphaigne et de développer un système de contrôle correspondant aux contraintes du site de Shippagan au Nouveau-Brunswick installé en 2014. La définition d’un système d’irrigation et de drainage adapté est basée sur les connaissances du drainage et de l’irrigation en agriculture et des besoins physiologiques de la sphaigne. Le développement des équipements a été réalisé en adaptant les concepts du système aux contraintes du site. L’analyse du système comprend les mesures à effectuer, les éléments à contrôler et les consignes d’opération. Les appareils de mesure du niveau de l’eau permettent d’évaluer et de transmettre au contrôle central les niveaux d’eau des fossés et de la nappe phréatique. Le contrôle central analyse les conditions et contrôle les pompes et les barrages à hauteur variable. L’énergie est fournie par un système de panneaux solaires et de batteries. Les barrages à hauteur variable permettent d’ajuster le niveau d’eau dans les fossés. Le système et les équipements développés répondent aux objectifs de conception. Des améliorations et une optimisation sont à faire. Le système permettra de continuer les travaux notamment au niveau de la modélisation de l’écoulement de l’eau et du contrôle prédictif.
Sphagnum farming is the cultivation of Sphagnum mosses to produce biomass of non-decomposed Sphagnum fibers on a cyclic and renewable basis. A water control system is required to maintain the water table level through the season, in the context of variable weather conditions. A drainage and sub-irrigation system has been designed and installed in 2014 on the Sphagnum farming site near Shippagan (N.B). The objectives of this project are to define the drainage and irrigation system for Sphagnum farming and develop an adapted system for the site. The design of the system is based on the Sphagnum requirements, agricultural knowledge of drainage and irrigation and respect of site constrains. Water level measurement equipment allows evaluation and transmission of the water table level and the water level in ditches to the central control. The central control analyzes the conditions and control the pumps and the variable level dams. The energy is supplied by a system of solar panels and batteries. The variable level dam adapts the water output level in the control structure. The developed system achieves the design objectives. Improvement and optimization are planned. The system will be the basis of future research, in particular about flow modeling and predictive control.
Sphagnum farming is the cultivation of Sphagnum mosses to produce biomass of non-decomposed Sphagnum fibers on a cyclic and renewable basis. A water control system is required to maintain the water table level through the season, in the context of variable weather conditions. A drainage and sub-irrigation system has been designed and installed in 2014 on the Sphagnum farming site near Shippagan (N.B). The objectives of this project are to define the drainage and irrigation system for Sphagnum farming and develop an adapted system for the site. The design of the system is based on the Sphagnum requirements, agricultural knowledge of drainage and irrigation and respect of site constrains. Water level measurement equipment allows evaluation and transmission of the water table level and the water level in ditches to the central control. The central control analyzes the conditions and control the pumps and the variable level dams. The energy is supplied by a system of solar panels and batteries. The variable level dam adapts the water output level in the control structure. The developed system achieves the design objectives. Improvement and optimization are planned. The system will be the basis of future research, in particular about flow modeling and predictive control.
Cazaurang, Simon. "Caractérisation des propriétés de transfert de la couverture végétale inférieure arctique : approche expérimentale et numérique couplée". Electronic Thesis or Diss., Toulouse, INPT, 2023. http://www.theses.fr/2023INPT0125.
Pełny tekst źródłaArctic environments are the regions that see the most significant climate warming of the Northern Hemisphere. These wetlands are widespread in Arctic ecosystems due to the large accumulation of organic matter (peat) produced by the organisms found there, Sphagnum mosses and lichens. The presence of large amounts of permanently frozen soil horizons (permafrost) makes these environments vulnerable. Numerous signals (increasing average annual temperatures, precipitation anomalies, changes in plant diversity) can already be observed. Climate projections for the year 2100 predict increases in temperature and precipitation in northernmost Arctic regions. These increases lead to the activation of climate feedback loops, which in return amplify climate change. The aim of this thesis is to study the low vegetation cover of Arctic wetlands (Sphagnum, lichens, peat) by considering them as a porous medium. A set of experimental and numerical techniques for studying porous media will be applied to samples from several sites: Khanymey (Siberia) as first place, but also Abisko (Sweden). Some samples from Clarens (France) are collected to serve as test samples. The samples are digitally reconstructed using X-ray tomography. The digital reconstruction is then used to study the morphological (§I), hydraulic (§II) and thermal (§III) properties of this biological porous medium. (§I) The morphological study shows a high porosity (sometimes more than 90%) for Sphagnum, lichen, and peat samples. High specific surface areas indicate a significant exchange and absorption potential for the study of element transfer. Representative Elementary Volumes (REV) may be defined for a majority of the samples. (§II) The simulation of a single-phase flow is used to compute the effective permeability of the studied samples. Samples with a REV are studied by direct numerical simulation at the REV scale. For samples without REV, a pore network is generated from the sample reconstruction. In both cases, the obtained values of the effective permeability tensor show a high hydraulic conductivity. The results are similar to other experimental tests reported in the literature and make it possible to overcome the problem of sample compressibility. (§III) The thermal properties are characterized using a coupled experimental and numerical approach. The experimental approach consists in studying the steady-state conductive heat transfer. The characterization of the effective thermal conductivity highlights the insulating property of the Arctic vegetation cover, with consistent values between each type of sample. The value of the intrinsic thermal conductivity of the plant material is calculated by inverse modeling of the experiments. Taken together, these transfer property studies provide a solid basis for generating an effective boundary condition for Arctic vegetation cover. However, further work is needed, in particular to quantify the influence of solar radiation flux on the energy balance of the Arctic vegetation cover. To this end, a preliminary work is presented that confirms the need for further information on the radiative transfer properties of this porous biological interface
Fabre, Marie-Chantal. "Aspects écologiques et cytologiques de la reproduction sexuée chez deux espèces de sphaignes (bryophyta) : Sphagnum palustre L. et Sphagnum flexuosum dozy et molk". Lille 1, 1987. http://www.theses.fr/1987LIL10132.
Pełny tekst źródłaPouliot, Kathy. "Les routes minérales en tourbières à sphaignes : restauration par enfouissement". Master's thesis, Université Laval, 2018. http://hdl.handle.net/20.500.11794/28316.
Pełny tekst źródłaThe electric power transmission lines network spans across the territory of the province of Québec on 34 000 kilometers and some of its sections inevitably go through peatlands. This restoration project has been conducted on two peatlands where access roads were constructed under power lines: at Sainte-Eulalie (Centre-du-Québec) and Chénéville (Outaouais). A mineral road in a peatland changes the nature of the substrate and can influence the water table level and the physicochemical characteristics of the water and peat. These changes can modify the composition and diversity of the vegetal communities. We examined if burying the mineral material within the bog is an effective method to restore the peatland conditions. The restoration by the “Burial Under Peat Layer Method” (BUPLM) consists in excavating and burying the mineral material beneath the underlying peat material. The method should allow to reach restorations goals by (1) confining the nutrients introduced with the mineral material, (2) by conserving a peaty surface elevation similar to the adjacent areas and (3) by re-establishing typical peatland vegetation. Whether it is 1 or 3 years post-restoration, the results of the physicochemical analyses of the water sampled at various depths and distances of the buried road showed similar nutriments concentrations to the means observed in the reference ecosystems. The soil elevation differences in the restored areas between readings are insignificant. Less than a growth season post-restoration, the Sphagnum mosses cover at Chénéville is 33 ± 9 %. At Sainte-Eulalie, 3 years post-restoration, the Sphagnum cover is lower (5 ± 3 %) because of the quality and quantity of the material available in the drained right-of-way. The results of this project show that the BUPLM complies with restoration objectives. Furthermore, it is economically profitable in comparison with the complete removal of the mineral material.
Picard, Hélène F. "Établissement d'espèces de sphaignes dans un contexte de production de biomasse". Thesis, Université Laval, 2010. http://www.theses.ulaval.ca/2010/27402/27402.pdf.
Pełny tekst źródłaLeroy, Fabien. "Effets des changements de végétation dans les tourbières à sphaignes sur le cycle du carbone". Thesis, Orléans, 2017. http://www.theses.fr/2017ORLE2029/document.
Pełny tekst źródłaPeatlands have stored a third of the soil organic Carbon (C) in only 3% of the land area. However, in response to global change, boreal and temperate peatlands may shift from Sphagnum to vascular plant-dominated peatlands that may alter their C-sink function. This thesis aims at providing a better understanding of the vascular plants interactions in a Sphagnum dominated peatland and their implications on the C cycle. This work mainly focus on the invasion of a graminoid plant, Molinia caerulea, through a mesocosm experiment. Results from experiments show that vascular plants are both able to promote the growth of Sphagnum mosses as well as the decomposition of their litter. Molinia caerulea occurrence appears to increase the C sink capacity of Sphagnum peat mesocosms passing of 30 to 220 gC stock m⁻² y⁻1. This capacity of Molinia caerulea to store C is probably due to it high roots productivity. However, it also seems to stimulate the decomposition of ‘old’ C, stored as peat, by stimulating microorganisms activity through roots exudates. These latter also promote the dissolved organic C consumption and CO₂ and CH₄ emissions observed with Molinia caerulea occurrence, as well as the temperature sensitivity of C exports by altering the microbial communities. Molinia caerulea impacts on microorganisms also affect N cycle conducting to a decrease of N₂O emissions in these ecosystems
D'Angelo, Benoît. "Variabialité spatio-temporelle des émissions de GES dans une tourbière à Sphaignes : effets sur le bilan carbone". Thesis, Orléans, 2015. http://www.theses.fr/2015ORLE2058/document.
Pełny tekst źródłaPeatlands cover only 2 to 3% of the land area but store between 10 and 25% of the soil carbon. The outcome of the anthropic and climatic pressure on these ecosystems is uncertain regarding their functions and storage. A better understanding of these ecosystems is needed to determine the factors and their interactions on greenhouse gas (GHG) emission. This work consist in monitoring GHG emissions and controlling factors in a Sphagnum peatland to estimate its carbon balance. Experimentation on mesocosms were carried out to explore the effect of hydrology on the fluxes and a monitoring on 4 sites was made to study the daily variability. Results show that La Guette peatland was a carbon source (-220 ± 33 gC m-2 an-1) in spite of the high water table level. The importance of the spatial variability measured in the site was also demonstrate. The hydrology effect was confirmed by the mesocosms experiments and high water table level shows that gas transport might have an effect. Finally the study of the daily variability show that the temperature sensitivity of the respiration might be different between day and night and that synchronizing soil temperatures and respiration can improve the respiration representation
Gilbert, Daniel. "Les Communautés microbiennes à la surface des tourbières à sphaignes : structure, fonctionnement et impact des apports de fertilisants". Clermont-Ferrand 2, 1998. http://www.theses.fr/1998CLF22084.
Pełny tekst źródłaAndersen, Roxane. "Évaluation du succès de la restauration écologique des tourbières à sphaignes : intégrations des critères physico-chimiques et microbiologiques au suivi à long terme". Doctoral thesis, Université Laval, 2008. http://hdl.handle.net/20.500.11794/20579.
Pełny tekst źródłaSt-Arnaud, Claudia. "Dynamique de la végétation d'un fen pauvre face à une simulation de réchauffement climatique : réponses potentielles des tourbières boréales à sphaignes". Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24414/24414.pdf.
Pełny tekst źródłaKsiążki na temat "Sphaigne"
Bastien, Denis-F. Clé d'identification macroscopique de 36 espèces de sphaignes de l'est du Canada. Ottawa, Ont: Commission géologique du Canada, 1997.
Znajdź pełny tekst źródłaPierre, Masson. Les sphaignes forestières du Québec méridional: Descriptions, clés analytiques et répartitions. Québec: Gouvernement du Québec, Ministère des ressources naturelles, Direction de la recherche forestière, Herbier du Québec, 1997.
Znajdź pełny tekst źródłaDelamare, Ernest, Ferdinand Renauld i Jules Cardot. Flora Miquelonensis: Florule de l'ile Miquelon . Enumération Systématique Avec Notes Descriptives des Phanérogames Vasculaires, Mousses, Sphaignes, Hépatiques et Lichens. Creative Media Partners, LLC, 2022.
Znajdź pełny tekst źródłaDelamare, Ernest, Ferdinand Renauld i Jules Cardot. Flora Miquelonensis: Florule de l'ile Miquelon . Enumération Systématique Avec Notes Descriptives des Phanérogames Vasculaires, Mousses, Sphaignes, Hépatiques et Lichens. Creative Media Partners, LLC, 2022.
Znajdź pełny tekst źródłaCzęści książek na temat "Sphaigne"
Gauthier, Robert. "Les sphaignes". W Écologie des tourbières du Québec-Labrador, 91–128. Presses de l'Université Laval, 2001. http://dx.doi.org/10.2307/jj.8816099.8.
Pełny tekst źródłaGauthier, Robert. "Les sphaignes". W Écologie des tourbières du Québec-Labrador, 91–127. Les Presses de l’Université de Laval, 2001. http://dx.doi.org/10.1515/9782763712222-006.
Pełny tekst źródłaRaporty organizacyjne na temat "Sphaigne"
Bastien, D. F., i M. Garneau. Clé d'identification macroscopique de 36 espèces de sphaignes de l'est du Canada. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1997. http://dx.doi.org/10.4095/209148.
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