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Former grads

Master | PhD

Post-doctoral students

Stephen Yamasaki
Post-doctoral (2000-2001)
Université Laval
Département des Sciences du Bois et de la Forêt
Faculté de Foresterie et de Géomatique

Flux de CO2 des sols perturbés par feu et par coupe / Indicateurs des sols pour la gestion durable des forêts


Anna Wallstedt
Post-doctoral (1999-2001)
(Boursière, Ministère de l’Éducation, Québec) Université Laval
Département des Sciences du Bois et de la Forêt
Faculté de Foresterie et de Géomatique

Mécanismes d’interférence entre la végétation éricacée et l’épinette noire


Ken Smith
Post-doctoral (1998-2000)
Université Laval
Département des Sciences du Bois et de la Forêt
Faculté de Foresterie et de Géomatique

Études comparatives des réserves et de la dynamique des éléments nutritifs en pessière après perturbation par feu et coupe avec protection de la régénération


PhD

Evelyne Thiffault
PhD in forest sciences (2007)
Université Laval
Département des Sciences du Bois et de la Forêt
Faculté de Foresterie et de Géomatique

Comparison analysis of the effects of the whole-tree and the stem-only harvesting methods on the productivity of soils

Intensity of forest harvesting, as defined by the level of tree biomass exportation from the forest site, raises an array of environmental issues, particularly about soil and forest regeneration nutritional status after harvest. Intensive forest harvesting methods like whole-tree harvesting (WTH) export larger amounts of organic matter and nutrients than less intensive methods such as stem-only harvesting (SOH); WTH is thus thought to be detrimental to soil productivity and forest nutrition. The objective of my thesis was to use empirical methods and dynamic modelling to examine the biogeochemical effects of WTH and SOH in a range of boreal stands of Quebec with contrasting vegetation and soil characteristics.


Patricia Raymond
PhD in forest sciences (2004)
Université Laval
Département des Sciences du Bois et de la Forêt
Faculté de Foresterie et de Géomatique

Evaluation of the effects of the group-selection method and the single-tree selection method on the regeneration of white pine (Pinus strobus) and its companion species in the hardwood forest of southwestern Quebec

The general objective of this research was to study the effects of group selection on white pine (Pinus strobus L.) regeneration growth, spatial variation and initial succession dynamics in tolerant hardwood – white pine stands. The first part of the project studied the effects of the treatments on the initial establishment and the spatial distribution of the regeneration and the soil microclimatic factors in the openings. The second part aimed to compare the effects of the treatments on the light availability, the invading plants and the growth of white pine seedlings. In the third part, the long-term effects of the openings on the behaviour of the white pine regeneration were evaluated. In light of the results, two strategies may be considered to maintain white pine presence in tolerant hardwood stands and to avoid a release treatment of natural regeneration : (1) create smaller gaps (0.7H) to improve natural seedlings microclimate and to reduce competition; 2) use large seedling stock to grow white pine under partial canopy in large gaps (2H).


Bénédicte Cherbuy
PhD in forest sciences (2003)
Université Laval
Département des Sciences du Bois et de la Forêt
Faculté de Foresterie et de Géomatique

Dynamique du carbone dans les sols de forêt boréale soumis à différents régimes de perturbations

Les écosystèmes forestiers boréaux jouent un rôle écologique essentiel puisqu'ils influencent de manière prépondérante le bilan global en carbone de la planète (Trumbore, 1997 ; Rapalee et al 1998 ; Striegl et Wickland 2000, Rayment et Jarvis 2000 ; Moren et Lindroth 2000). Auparavant structurés par les incendies récurrents (Trumbore, 1997 ; Smith et al, 2000), ces milieux naturels sont actuellement soumis à un nouveau régime de perturbation lié à la sylviculture (Smith et al, 2000). Dans le contexte actuel (augmentation de la teneur en CO2 atmosphérique et réchauffement climatique), il est nécessaire de s'interroger sur l'impact d'une modification du régime de perturbations sur le fonctionnement de ces milieux, en particulier en terme de bilan en carbone. L'utilisation de modèles peut permettre d'estimer la durabilité à long terme de différentes pratiques sylvicoles en considérant l'évolution de l'écosystème sur plusieurs rotations (Perry, 1998). Cette approche suppose une bonne connaissance des processus écologiques clés qui structurent les systèmes naturels. Le processus de recyclage du carbone du sol en forêt boréale a fait l'objet de nombreuses études mais les connaissances sur le sujet restent encore fragmentaires (Nakane et al, 1997).

Le premier objectif de mon projet de recherche est de prédire les impacts de différents modes de gestion sylvicoles sur les flux et les stocks de carbone en forêt boréale sous différents scénarios de perturbations (naturelles ou anthropiques) par le biais de la modélisation. Cette approche pourra également permettre de définir des seuils de perturbation (en terme d'intensité et de fréquence) à partir desquelles le système est susceptible de perdre sa résilience, c'est dire de basculer d'un état dans un autre. Un deuxième objectif de ce projet est d'améliorer les connaissances sur le processus de recyclage du carbone dans le sol en forêt boréale afin d'affiner la précision du modèle. En particulier, on se propose d'appréhender le rôle de la couche de mousse dans le cycle du carbone au niveau du compartiment sol.


Catherine Périé
PhD in forest sciences (2003)
Université Laval
Département des Sciences du Bois et de la Forêt
Faculté de Foresterie et de Géomatique
Étude de la variabilité spatio-temporelle d'indicateurs de la qualité des sols pour le suivi des traitements sylvicoles


Nelson Thiffault
PhD in forest sciences (2002)
Université Laval
Département des Sciences du Bois et de la Forêt
Faculté de Foresterie et de Géomatique

Conifer plantation establishment in relation to scarification and vegetation competition

Competition for water, nutrients and light frequently leads to plantation failure, although their relative importance varies with site characteristics. Stock type, silvicultural activities and site characteristics can interact to influence white, black and Norway spruce seedling growth and survival. The objective of this study was to isolate each of these factors so as to evaluate their contribution to conifer plantation establishment.

The effects of scarification and competing vegetation on soil temperature, water content and fertility for three years on two experimental sites in eastern Quebec were studied. Results showed that scarification was not required prior to plantation on sites of the sub-boreal mixedwood region of Quebec, because it did not influence seedling microclimate. Vegetation showed a tendency after three growing seasons to negatively influence soil resource availability.

The ericaeous shrub Kalmia angustifolia L. interferes with the establishment of planted seedlings on some boreal forest sites in northeastern North America. In a study we found that kalmia had a significant negative impact on seedling growth, but these growth reductions were not related to water stress, soil temperature or soil moisture.


Jean-François Boucher
PhD in forest sciences (2002)
Université Laval
Département des Sciences du Bois et de la Forêt
Faculté de Foresterie et de Géomatique

Acclimation and growth of white pine in environmental conditions created by a shelterwood harvest.

The main two objectives of this research were to 1) measure the growth response of eastern white pine (Pinus strobus L.) seedlings to silvicultural treatments in the context of the shelterwood system and 2) determine the acclimation capacity, both morphological and physiological of white pine seedlings to environmental conditions created by such a system, particularly after the regeneration cut. In one study, available photosynthetic photo flux density (%PPFD) at seedling height, growth, and morphological variables of planted white pine seedlings were measured during their third growing season in a complete block factorial design located in a mature white and red pine forest in Ontario (Canada). In another study, eastern white pine seedlings were subjected to environmental conditions created by different intensities of regeneration cut, soil scarification and application of herbicide. Growth, morphological and physiological responses were examined. In a third study, greenhouse experiment was set up during one growing season to test the hypothesis that soil temperature controls a significant part of the light response of eastern white pine seedlings that is observed in the field. A moderate regeneration cut intensity combined with soil scarification was recommended as an optimum treatment combination to promote both growth and protection of white pie seedlings under a shelterwood system.



Master

Richard Daigle
Maîtrise en Sciences-Forestières (2003)
Université Laval
Département des Sciences du Bois et de la Forêt
Faculté de Foresterie et de Géomatique

Response of Canada yew (Taxus canadensis Marsh.) to different pruning intensities

Despite increasing harvest pressure for taxanes, Canada yew’s growth and physiology were poorly studied until this study. This research quantified the biomass and taxane content responses of Canada yew following four pruning intensities and three pruning periods to find the best combination that would insure a sustainable management of this newly important resource in the province of Quebec. Recommendations include a fall harvest to maximize taxane yield, and follow the Quebec provincial norms.


Jean-Robert Genin\\ Master in forest sciences avec essai (2002)
Université Laval
Département des Sciences du Bois et de la Forêt
Faculté de Foresterie et de Géomatique

Impact de la coupe avec protection du sous-étage sur la structure et la dynamique des peuplements dans la forêt boréale de l’ouest du Canada


Bocar Cire Ly
Master in forest sciences (1997)
Université Laval
Département des Sciences du Bois et de la Forêt
Faculté de Foresterie et de Géomatique

Reforestation potential of Tamarix senegalensis in the saline soils of the lower delta of the Senegal River

Tamarix senegalensis is one of the best adapted native shrubs in the saline ecosystems of the lower Senegal valley. This research evaluated the growth and nutrition of this species, at seven different levels of additions of NaCl solution combined with the presence or absence of a rooting hormone. A second study examined the relation between increase in height and diameter and the nutrition of the species across a natural gradient of salinity on four sites.


Jean-François Boucher
Master in forest sciences (1997)
Université Laval
Département des Sciences du Bois et de la Forêt
Faculté de Foresterie et de Géomatique

Écophysiologie du pin blanc (Pinus strobus L.) en plantation soumis à des traitements sylvicoles intensifs
The impacts of intensive silvicultural treatments and competition on leaf level morphological and physiological responses of seven year old planted eastern white pine saplings Pinus strobus L. saplingsl were studied. The effects of foliar absorption of dew by eastern white pine seedlings were also examined in a greenhouse experiment.


Lucie Thibodeau
Master in forest sciences (1996)
Université Laval
Département des Sciences du Bois et de la Forêt
Faculté de Foresterie et de Géomatique

Impact of precommercial thinning on the fertility and microbial biomass in a boreal forest soil

The objective of this study was to evaluate the impact of pre-commercial thinning in the boreal forest on soil fertility and soil microbial biomass in three soil moisture regimes: xeric mesic, and humid. The treatment consisted of thinning balsam fir (Abies balsamea) stands to an average densisty of 3,000 stems/ha. Soil temperature was highter in the thinned plots and the availability of potassium, phosphorus and base saturation also increased. Initial levels of inorganic nitrogen before incubation were higher following thinning, however net mineralization tended to decrease. The increase in microbial biomass-N confirmed that the treatment contributes to N immobilization in the short term. The thinning treatment also increased concentrations of N, P, and K in current 1-year and 2-year old needles.


Oumar Touré
Master in forest sciences (1993)
Université Laval
Département des Sciences du Bois et de la Forêt
Faculté de Foresterie et de Géomatique

Production et nutrition de quatres provenances du Eucalyptus canadensis Dehn sur deux sols de la moyenne vallée du fleuve Sénégal


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