Personne : Hogue-Hugron, Sandrine
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Département de phytologie, Faculté des sciences de l'agriculture et de l'alimentation, Université Laval
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- PublicationAccès libreLa recolonisation spontanée des bancs d'emprunt et essais de restauration à l'aide de bryophytes et de lichens(2010) Hogue-Hugron, Sandrine; Rochefort, Line; Poulin, MoniqueLa présence des bancs d'emprunts, utilisés comme sablières et gravières lors de la construction de routes dans la forêt boréale, est problématique. Les facteurs influençant la colonisation naturelle des plantes dans ces milieux ont d'abord été étudiés. Les résultats indiquent que la physicochimie et l'humidité du sol ont la plus grande influence. De plus, les bryophytes et les lichens sont les principaux colonisateurs primaires des bancs d'emprunt. Nous avons donc émis l'hypothèse que l'introduction de ces plantes invasculaires pourrait accélérer la végétalisation des bancs d'emprunt. Trois expériences de restauration à l'aide de bryophytes et de lichens ont été mises en place. Les résultats de ces expériences montrent que l'établissement des bryophytes et des lichens à partir de fragments est possible en une saison de croissance. L'ajout d'un paillis de paille a eu un effet négatif sur leur établissement.
- PublicationAccès libreCan indicator species predict restoration outcomes early in the monitoring process? A case study with peatlands(Elsevier Science Ireland, 2013-09-01) Hogue-Hugron, Sandrine; Rochefort, Line; Boudreau, Stéphane; Poulin, Monique; González, EduardoSuccess in ecological restoration is rarely assessed rigorously due to insufficient planning for post-restoration monitoring programs, limited funding and, especially, lack of scientifically validated evaluation criteria and protocols. In this article, we propose the use of the Indicator Value Index technique (IndVal), which statistically determines the association of species to one or several particular site types, to obtain indicators of success at the early stages of the recovery process in restoration projects. Peat bogs harvested by vacuum-milling, subsequently restored by a moss-transfer technique and regularly monitored for ~10 years were used as a model system to test this approach. We first identified 34 restored sectors of ~10 ha from 4 to 11 years old in twelve eastern-Canadian bogs. These sectors were then classified according to their degree of success in recovering a typical sphagnum moss carpet (restoration goal). Then, we retrospectively reviewed vegetation communities recorded at the third year after restoration to identify indicator species of different categories of restoration success, using the IndVal methodology. By identifying early indicator species, our method provides a tool that guides intervention soon after restoration if a site is not on a desired successional trajectory. Typical bog species, namely the bryophytes S. rubellum and Mylia anomala and the tree Picea mariana, were indicative of successful restoration; while bare peat, lichens and one species of ericaceous shrubs (Empetrum nigrum), which cope better under drier conditions, indicated sites where restoration failed. A surprising finding was that the moss Polytrichum strictum, which is known to facilitate the colonization of sphagnum in disturbed peatlands, is an early indicator of unsuccessful restoration. This finding made us question the nursing role of P. strictum at a cover threshold above ca. 30%, when P. strictum could be outcompeting sphagnum and become dominant. We conclude that the IndVal method is an effective tool to identify early indicators of restoration success when combined with a thoughtful examination of species frequency and cover within each site type.
- PublicationAccès libreReintroduction of salt marsh vegetation and phosphorus fertilisation improve plant colonisation on seawater-contaminated cutover bogs(International Mire Conservation Group, 2016-01-01) Hogue-Hugron, Sandrine; Emond, Catherine; Rochefort, Line; Lapointe, LineCoastal bogs that are used for peat extraction are prone to contamination by seawater during storm events. Once contaminated, they remain mostly bare because of the combination of high salinity, low pH, high water table and low nutrient availability. The goal of this research was to investigate how plant colonisation at salt-contaminated bogs can be accelerated, in order to prevent erosion and fluvial export of the peat. At two seawater-contaminated bogs, we tested the application of rock phosphate and dolomitic lime in combination with five plant introduction treatments&58; transplantation of Carex paleacea&59; transplantation of Spartina pectinata&59; transfer of salt marsh diaspores in July&59; transfer of salt marsh diaspores in August&59; and no treatment (control). The effects of different doses of lime on the growth of C. paleacea and S. pectinata were also investigated in a greenhouse experiment. In the field, phosphorus fertilisation improved plant growth. Transplantation of C. paleacea resulted in the highest plant colonisation, whereas salt marsh diaspore transfer led to the highest species diversity. Lime applications did not improve plant establishment in either the field or the greenhouse. To promote revegetation of seawater-contaminated cutover bogs, adding P is an asset, Carex paleacea is a good species to transplant, and the transfer of salt marsh diaspores improves plant diversity.
- PublicationAccès libreEstablishing a moss cover inhibits the germination of Typha latifolia, an invasive species, in restored peatlands(Elsevier, 2012-03-27) Bourgeois, Bérenger; Hogue-Hugron, Sandrine; Poulin, MoniqueInvasion of Typha latifolia L. into man-made pools in restored North American peatlands may represent a serious barrier to the establishment of a plant community typical of natural pool edges. As no classical method of population management appears applicable in the context of peatlands, our aim was to determine the ability of three environmental factors to inhibit T. latifolia germination, namely peat type, shade level and moss cover. A split-plot experiment conducted in a growth chamber investigated the effects of three substrates (fibric peat, mesic peat and filter paper) and six shade levels (including total obscurity) on germination rates of T. latifolia. In a second, greenhouse experiment, the effect of three increments of moss cover (null, fragmented and full) growing on two peat types (fibric and mesic) was examined for six corresponding seedbeds. Our results show that peat type was the major factor affecting germination, as almost none occurred on fibric peat while germination rates reached 84% on mesic peat. However, germination on mesic peat decreased with increasing moss cover: the germination rate dropped from 36 ± 3% on bare peat to 1 ± 0% in full moss carpets. Germination of T. latifolia was initiated by very low light levels (as low as 6%) but was inhibited by total obscurity. The low pH of fibric peat as well as the modification of environmental factors (e.g. light or substrate access) by moss carpets appear to be factors explaining the results. Establishing a dense moss cover and digging pools to a depth that prevents the exposure of peat with a pH favorable to seed germination (above 4) might be efficient methods to reduce Typha latifolia invasions in restored peatland pools.