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Journal articles on the topic 'Plantes des tourbières'

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Published: 22 June 2024

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1

Pellerin, Stéphanie, Camille Gratton, Martin Lavoie, and Monique Poulin. "Différenciation biotique et perte de plantes de milieux humides dans les tourbières ombrotrophes boisées." Le Naturaliste canadien 147, no. 2 (2023): 57. http://dx.doi.org/10.7202/1105485ar.

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2

Richard, Pierre J. H. "Écologie des tourbières du Québec-Labrador." Bryologist 106, no. 1 (March 2003): 194–95. http://dx.doi.org/10.1639/0007-2745(2003)106[0194:r]2.0.co;2.

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3

Thébaud, Gilles, Pierre Goubet, Renée Skrzypczak, and Éric Sourp. "Communautés végétales des tourbières ombrotrophes du Massif central oriental (France)." Acta Botanica Gallica 156, no. 3 (January 2009): 341–77. http://dx.doi.org/10.1080/12538078.2009.10516164.

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4

Couillard, Line, and Serge Payette. "Évolution holocène d'une tourbière à pergélisol (Québec nordique)." Canadian Journal of Botany 63, no. 6 (June 1, 1985): 1104–21. http://dx.doi.org/10.1139/b85-152.

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The Holocene development of a peat plateau peatland in northern Québec has been reconstructed from present vegetation and buried macrofossil analogues found in peat. This peatland is presently formed by nine morphological units characterized by homogenous site conditions (drainage, topography, and vegetation cover). Seven ombrotrophic and eight minerotrophic vegetation types are found in the peatland, but the ombrotrophic types cover 66% of the peatland surface. Reconstitution of the Holocene peatland development from 3700 BP to present was based on the succession of bryophytes within the morphological units. Between 3200 and 2700 BP, minerotrophic vegetation such as sedge fens, pools, and tamarack woodlands (now locally extinct) dominated the peatland. Peat plateaus and palsas were progressively formed after 2700 BP. The expansion of these units is closely related to several cooling periods that occurred after 2700, 1400, 1100, 700, and 150 BP. Thermokarst pools were created within the peat plateaus around 1100 BP after a burn, and other similar depressions formed around 340 BP and Present because of the recent climatic warming. Plant successions show that long-term vegetation development in the peatland is rather complex and diversified. These successions indicate that peat plateaus gradually developed during the last thousand years in relation with topographical conditions, drainage, vegetation cover, fire, and climate. Palsas were formed more recently than peat plateaus, between 700 and 500 years BP, and around 150 years BP.
5

Botineau, Michel, Axel Ghestem, and Askolds Vilks. "La tourbière de Pioffray (Haute-vienne): un site botanique remarquable." Acta Botanica Gallica 140, no. 1 (January 1993): 57–61. http://dx.doi.org/10.1080/12538078.1993.10515567.

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6

Laprise, Danielle, and Serge Payette. "Évolution récente d'une tourbière à palses (Québec subarctique) : analyse cartographique et dendrochronologique." Canadian Journal of Botany 66, no. 11 (November 1, 1988): 2217–27. http://dx.doi.org/10.1139/b88-304.

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During the past 100 years, palsa bogs located on the eastern coast of Hudson Bay have undergone major changes associated with global climatic warming of the northern hemisphere. The recent main developmental stages of palsas, collapse scars, and thermokarstic pools were reconstructed within a representative permafrost peatland located in the southern part of the forest–tundra, using detailed mapping and tree-ring analyses. Maps of the peatland in 1957, 1973, and 1983 indicate a 49% decrease of the total cover of palsas and collapse scars between 1957 and 1983 and a 44% increase of the thermokarstic pool surface. Degradation of the palsa bog was more pronounced between 1957 and 1973 than between 1973 and 1983. Tree-ring analysis of reaction wood on black spruce (Picea mariana (Mill.) BSP.) exposed to unstable peat substratum indicates that permafrost degradation, which began as early as 1880, increased markedly between 1930 and 1965. During the 19th century, the permafrost peatland was mainly composed of large peat plateaus, which subsequently disintegrated into residual palsas, collapse scars, and thermokarstic pools. In addition the increase in temperature during the 20th century, it seems that milder winters with heavier snowfalls promoted conditions conducive to permafrost degradation. The constantly increasing contrast in the microtopographic pattern of the peatland, resulting from the transformation of peat plateaus into smaller palsa units, created more snow cover on east and southeast palsa slopes, thus accelerating permafrost degradation. This autocatalytic process seems to have also played a role in some sections of the peatland with abundant thermokarstic pools, where major changes in drainage conditions have stimulated thermokarstic erosion.
7

Jean, Martin, and André Bouchard. "La végétation de deux tourbières de la municipalité régionale de comté du Haut-Saint-Laurent (Québec)." Canadian Journal of Botany 65, no. 10 (October 1, 1987): 1969–88. http://dx.doi.org/10.1139/b87-271.

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Within a multidisciplinary study of terrestrial ecosystems of the Haut-Saint-Laurent Regional County Municipality, the vegetation of "Large Teafield" and "Small Teafield" peatlands is described from 127 stands. Detrended correspondence analysis and correlations between data indicate that the greatest vegetational variation is expressed by variables related to trophic regime (e.g., pH of peat) and moisture regime (e.g., organic content). In addition to gradient analysis, hierarchical clustering combined with reference to contingency tables is used to characterize the typology along gradients. Mapping of the community types partially relates the distribution analysis to a circular spatial pattern of the vegetation. Highly oligotrophic sites are colonized by low shrubs. Chamaedaphne calyculata is found at the centre of the peatlands, where the peat deposit is thick and fire does not play an important role. Low shrubs dominated by Betula populifolia surround the Chamaedaphne calyculata vegetation and are more affected by burning towards the perimeter. Heavily burned sites are dominated by Epilobium angustifolium. The perimeters of the peatlands are colonized by Betula populifolia or Populus tremuloides open forests, while the most stable forests are dominated by Acer rubrum. Some marshes and swamps are present where the peat deposit is thin. Sixteen community types are described for the study area.
8

Dionne, Jean-Claude. "Les champs de blocs en Jamésie, Québec subarctique." Géographie physique et Quaternaire 32, no. 2 (January 25, 2011): 119–44. http://dx.doi.org/10.7202/1000345ar.

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Les champs de blocs, définis au sens large comme des concentrations plus ou moins denses de cailloux, avec ou sans matrice fine, sur des surfaces relativement planes, dépourvues de couverture végétale, abondent en Jamésie, entre 50°-56° lat. N. On les trouve à partir du rivage actuel jusque sur les sommets des monts Otiches. Ils sont de nature et d’origine variées. Au point de vue morphologique, on distingue deux grandes catégories : ceux formés par des concentrations denses de cailloux sans matrice fine et ceux constitués par des concentrations lâches de cailloux en surface. Du point de vue génétique et environnemental, on distingue les types suivants : champs de blocs de délavage, champs de blocs périglaciaires, champs de blocs littoraux (notamment glaciels) et champs de blocs glaciaires. Les champs de blocs les plus caractéristiques sont ceux produits par le délavage du till ou des sédiments fluvio-glaciaires et ceux dus aux processus périglaciaires qui représentent environ 75% de tous les champs de blocs de la Jamésie. Ils se rencontrent dans des dépressions humides, autour de lacs et de tourbières, dans des gouttières sur des versants à pente faible, concentrant les eaux de ruissellement, ou dans le fond de chenaux fluvio-glaciaires et le lit d’anciens cours d’eau. Ils couvrent des superficies ayant quelques centaines de mètres carrés à plus de 2 km2. Ils sont formés par des concentrations denses de cailloux ayant des proportions variables d’éléments anguleux à arrondis, sans matrice fine et sans couverture végétale. Les champs de blocs périglaciaires diffèrent de ces derniers par la prédominance des éléments anguleux et par la nature lithologique des cailloux qui est identique à celle du substrat rocheux local.
9

Dionne*, Jean-Claude. "Données complémentaires sur la transgression laurentienne, à Montmagny (Québec), à partir d’une coupe dans la partie arrière de la terrasse de 8-10 mètres." Géographie physique et Quaternaire 57, no. 2-3 (September 22, 2005): 249–53. http://dx.doi.org/10.7202/011319ar.

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Résumé Une excavation récente, d’environ 6 m de profondeur, a permis d’observer les unités lithostratigraphiques composant la partie arrière de la terrasse de 8-10 m, entre Montmagny et Cap-Saint-Ignace. On y a trouvé 3 des 5 unités exposées dans la falaise vive, à l’extrémité est de l’aéroport. Les unités manquantes sont le dépôt infratidal limono-argileux daté de 8 à 7 ka et la couche organique datée de 7 à 6 ka. Dans la partie arrière de la terrasse de 8-10 m, l’argile de la Mer de Goldthwait, qui est à une altitude d’environ 5 m, en comparaison de 1 m au droit de la falaise vive, est surmontée d’une couche de sable et gravier d’une trentaine de centimètres d’épaisseur. Un fragment de bois au sommet de cette unité a donné un âge au 14C de 5970 ± 70 BP (UL-2737). Cette couche grossière est recouverte d’environ 3 m de rythmites tidales limono-sableuses contenant d’abondants débris de plantes aquatiques in situ qui ont donné un âge de 5460 ± 70 BP (UL-2719), alors que deux fragments de bois à la base de l’unité ont été datés respectivement à 5640 ± 70 (UL-2735) et 5650 ± 70 BP (UL-2718). L’unité intertidale mise en place lors de la transgression de l’Holocène moyen est coiffée par une tourbière d’une soixantaine de centimètres d’épaisseur. La base de cette dernière a donné un âge au 14C de 5080 ± 60 BP (UL-2740) pour la tourbe et de 5020 ± 70 BP (UL-2737) pour une souche de mélèze (Larix sp.). Cette coupe confirme donc l’étendue et l’altitude de la Transgression laurentienne dans le secteur entre la rivière du Sud, à Montmagny, et Cap-Saint-Ignace.
10

Francez, André-Jean, and Pierre Loiseau. "Devenir de l'azote minéral dans une tourbière à Sphagnum fallax Klinggr. et Carex rostrata Stokes du Massif central (France)." Canadian Journal of Botany 77, no. 8 (November 21, 1999): 1136–43. http://dx.doi.org/10.1139/b99-100.

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The fate of mineral nitrogen (N) in an oligotrophic fen, located in Monts de Forez (Puy-de-Dôme department), was studied by 15N tracking of 0.5 g (nitrogen)·m-2·year-1 ammonitrate labelled on both ions (30% excess). Simulating atmospheric deposits, an important nutrient source in mires, N additions were made at two periods of the year, June and August, 1986, and the fate of the nitrogen was measured in October of the same year. Nitrogen recovery was measured in the living parts of Sphagnum fallax Klinggr., aerial and hypogeous parts of Carex rostrata Stokes, and in peat. Vegetation preferably absorbed nitrogen in June, as compared to August, the period during which nitrogen allocation to hypogeous phytomasses of Carex was the highest. As compared to Carex, Sphagnum has strong nitrogen assimilation and holding potentials. A nitrogen competition potential index or "nitrogen sink power" (PCN), calculated from recovery and stock data, showed that Sphagnum was more efficient at intercepting nitrogen in August, when rainfall is the lowest in the studied area. In peat, nitrogen recovery was strongest in August. Most of the microbial processes seem to occur in the first 10 cm. Gross nitrogen mineralization and immobilization, calculated from organic matter degradation, were estimated as 11.4 and 6.9 g·m-2·year-1, respectively. The gross mineralization estimation according to the method of Fried and Dean was 17.2 g·m-2·year-1. This overestimation might be attributed to an underestimation of the nitrogen derived from input in plants and an overestimation of nitrogen from peat.Key words: 15N, nitrogen balance, nitrogen uptake, competition, retention, turfigenous process.
11

Hugonnot, Vincent, Pierre Boudier, Pierre-Emmanuel Mulot, and Thierry Vergne. "Cephalozia macrostachyaKaal. indicateur de l'état de conservation d'une tourbière en Sologne (Cher, France); son utilité dans la problématique de gestion." Acta Botanica Gallica 158, no. 3 (January 2011): 329–45. http://dx.doi.org/10.1080/12538078.2011.10516277.

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12

Corriol, Gilles. "Essai de clé typologique des groupements végétaux de Midi-Pyrénées et des Pyrénées françaises. IV Tourbières basses (Scheuchzerio - Caricetea)." Bulletin mensuel de la Société linnéenne de Lyon 83, no. 3 (2014): 61–86. http://dx.doi.org/10.3406/linly.2014.13904.

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13

Bernard, Jacques. "Etude palynologique de la tourbière du Pas-du-Gu en Saint-Brévin (Loire-Atlantique). Eléments de paléoenvironnement holocène de la côte atlantique." Acta Botanica Gallica 141, no. 3 (January 1994): 373–86. http://dx.doi.org/10.1080/12538078.1994.10515171.

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14

Bégeot, Carole, and Hervé Richard. "L'origine récente des peuplements de Pin à crochets (Pinus uncinataMiller ex Mirbel) sur la tourbière de Frasne et exploitation de la tourbe dans le Jura." Acta Botanica Gallica 143, no. 1 (January 1996): 47–53. http://dx.doi.org/10.1080/12538078.1996.10515318.

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15

Goubet, Pierre, and Fabrice Darinot. "L'histoire de la tourbière de la Réserve naturelle nationale du Marais de Lavours : ce que nous révèlent les macrorestes." Bulletin mensuel de la Société linnéenne de Lyon 3, no. 1 (2014): 17–29. http://dx.doi.org/10.3406/linly.2014.13861.

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16

Francez, André-Jean. "Dynamique du carbone et de l'azote chez le Carex rostrata, l’Eriophorum vaginatum et le Calluna vulgaris dans une tourbière à sphaignes des monts du Forez (France)." Canadian Journal of Botany 73, no. 1 (January 1, 1995): 121–29. http://dx.doi.org/10.1139/b95-014.

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Seasonal fluctuations in the biomass, necromass, and litter decay of Carex rostrata, Eriophorum vaginatum, and Calluna vulgaris were studied in the mire complex of Côte-de-Braveix, at 1350 m of altitude in the Forez Mountains of the eastern part of the Massif central (France). The primary production of these three dominant species of the main development stages of the studied peatland were respectively 456, 353, and 531 g ∙ m−2 ∙ a−1; the corresponding N fluxes were 4.5 g ∙ m−2 ∙ a−1 for the first two species and 5.2 g ∙ m−2 ∙ a−1 for the latter. The subterranean parts (rhizomes and roots) represented 66, 73 and 46% of the C production and 44, 47 and 37% of the N production, respectively. The biomass and N turnover rates were the highest in the E. vaginatum community (1.3 and 1.6) and the lowest in C. vulgaris (0.8 and 0.9); they were 1.1 and 1.2 in the C. rostrata community. The first year decomposition rate was equal to 0.30, 0.21 and 0.16 in the C. rostrata, E. vaginatum, and C. vulgaris litters. The production/accumulation ratio decreased from the fen to the bog species : 1.4 (C. rostrata), 1.3 (E. vaginatum), and 1.2 (C. vulgaris). The C and N balances are discussed from the viewpoint of ecological succession and peatland ecosystem development. Key words: fen, bog, primary production, decomposition, peat, succession.
17

"Les tourbières de Margeride." Acta Botanica Gallica 141, no. 5 (January 1994): 672–75. http://dx.doi.org/10.1080/12538078.1994.10515223.

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18

"Les tourbières du Devès." Acta Botanica Gallica 141, no. 5 (January 1994): 677–79. http://dx.doi.org/10.1080/12538078.1994.10515224.

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