Benoit Lafleur's research while affiliated with Université du Québec à Montréal and other places

Publications (58)

Article
Full-text available
Changing climates are altering the structural and functional components of forest ecosystems at an unprecedented rate. Simultaneously, we are seeing a diversification of public expectations on the broader sustainable use of forest resources beyond timber production. As a result, the science and art of silviculture needs to adapt to these changing r...
Chapter
Full-text available
Monitoring of forest response to gradual environmental changes or abrupt disturbances provides insights into how forested ecosystems operate and allows for quantification of forest health. In this chapter, we provide an overview of Smartforests Canada, a national-scale research network consisting of regional investigators who support a wealth of ex...
Article
Fertilization of hybrid poplar (HP) plantations with papermill by-products is a promising solution to improve soil fertility and nutrient availability, increase plantation productivity, and provide added value to these materials that would otherwise be incinerated or sent to the landfill. We assessed the growth and foliar nutrition of a HP clone (P...
Article
Full-text available
Global forest area is declining rapidly, along with degradation of the ecological condition of remaining forests. Hence it is necessary to adopt forest management approaches that can achieve a balance between (1) human management designs based on homogenization of forest structure to efficiently deliver economic values and (2) naturally emerging se...
Article
Full-text available
Dans le cadre du Carrefour Forêts 2019, le colloque Sylviculture d'adaptation aux changements climatiques : des concepts à la réalité, organisé conjointement par la Direction de la recherche forestière du ministère des Forêts, de la Faune et des Parcs du Québec et le Centre canadien sur la fibre de bois de Ressources naturelles Canada, a rassemblé...
Article
Full-text available
As part of the Carrefour Forêts 2019 Conference, the forest research branch of Quebec's Ministère des Forêts, de la Faune et des Parcs and the Canadian Wood Fibre Centre of Natural Resources Canada organized jointly the symposium "Adaptive silviculture to climate change: from concepts to reality". The symposium brought together a hundred actors fro...
Article
A combination of wildfires and defoliating insect outbreaks play an important role in the natural successional dynamics of North American boreal mixedwood forests, which, in the long term, change the post‐disturbance composition and structure of forest stands. After stand‐replacing disturbances (mainly wildfires), early successional hardwoods typic...
Article
Forest management aims to better understand effects of natural disturbance regimes on forest dynamics and use this knowledge to formulate guidelines in forest planning, thereby narrowing gaps between managed and unmanaged forest landscapes. Using forest simulators to reconstruct forest dynamics in relation to ecosystem processes, including disturba...
Article
Full-text available
Over the past two decades, partial harvesting has been increasingly used in boreal forests as an alternative to clearcutting to promote irregular stand structures and maintain a balance between biodiversity preservation and continued timber production. However, relatively little is still known about the silvicultural potential of partial harvesting...
Article
Full-text available
Over the last three decades, the ecological basis for the generalized use of even-aged silviculture in boreal forests has been increasingly challenged. In boreal mixed-wood landscapes, the diminishing proportion of conifers, to the benefit of intolerant hardwoods, has been a primary concern, coupled with the general rarefication of old-growth conif...
Conference Paper
Primary succession of vegetation in post-mining areas offers great opportunities to study, how mycorrhizal symbiosis influence the revegetalization in degraded environments. Fungal mycelia produce common mycorrhizal networks by colonizing roots of neighboring trees, and those networks facilitate the uptake and transportation of nutrients among plan...
Preprint
Full-text available
Several studies have focused on silvicultural methods to evaluate their effects on residual stand structure, tree mortality, etc. However, the effects of mixing and interspecific interactions at the scale of a regenerating stand on the abundance and growth of natural regeneration have not been studied to date. Moreover, the phenomenon of complement...
Article
Ecosystem management promotes the integration of knowledge of natural ecosystem dynamics into forest-management planning and practices, and provides a useful framework for understanding and mitigating the impacts of timber harvesting on biodiversity and ecosystem functions. Understory vegetation and deadwood are involved in many ecosystem functions...
Article
Full-text available
Plant traits—the morphological, anatomical, physiological, biochemical and phenological characteristics of plants—determine how plants respond to environmental factors, affect other trophic levels, and influence ecosystem properties and their benefits and detriments to people. Plant trait data thus represent the basis for a vast area of research sp...
Article
Full-text available
Changes in the light availability in forests generated by diversified retention patterns (e.g., clear cut, partial harvest) have been shown to strongly filter the plant species present. Modified soil microsite conditions due to post-harvest site preparation (e.g., mechanical site preparation, prescribed fire) might also be an important determinant...
Conference Paper
Full-text available
Mycorrhizal symbiosis plays a key role in ecological processes like plant succession through the redistribution of resources among host plants with different needs. Mycorrhizal mycelia produce Common Mycorrhizal Networks (CMNs) by colonizing roots of neighboring trees, and these CMNs facilitate the uptake and transportation of nutrients among plant...
Article
In the managed portion of the boreal forest of eastern North America, logging has replaced fire as the most important disturbance agent. There, a large proportion of timber is harvested in forests susceptible of accumulating a thick Sphagnum layer that decreases forest productivity, a process called paludification. In such a context, understanding...
Article
Canada's boreal forest represents an important contributor of the world's wood supply industry. However, maintaining or increasing productivity of the boreal forest may be challenging in areas dominated by forested peatlands. Moreover, sustainable management of these forests must also consider other important aspects of the forest ecosystem such as...
Article
In temperate and boreal mixedwood forests of eastern North America, partial disturbances such as insect outbreaks and gap dynamics result in the development of irregular forest structures. From a forest ecosystem management perspective, management of these forests should therefore include silvicultural regimes that incorporate medium- to high-reten...
Article
Full-text available
A plant's genotype, their environment, and the interaction between them influence its growth and development. In this study, we investigated the effect of these factors on the growth and biomass yield of willows in short-rotation coppice (SRC) under different harvesting cycles (i.e., two- vs. three-year rotations) in Quebec (Canada). Five of the co...
Article
Short rotation coppice willow (Salix sp.) is well established as an effective phytoremediation crop and is also emerging as an attractive lignocellulosic bioenergy option. The prospect of integrating value-added renewable chemicals as a supplementary component of the crop’s value is explored here in terms of absolute phenolic yields, extractable fr...
Article
Full-text available
The establishment of short-rotation willow coppice plantations for bioenergy production is proposed as a land management practice to reduce the use of fossil fuels. However, there is little information on the performance of different willow (Salix spp.) cultivars on various types of soils and over climate gradients. This study aimed to determine wh...
Article
Strategies for increasing the mobilization of forest biomass supply chains for bioenergy production require continuous assessments of the spatial and temporal availability of biomass feedstock. Using remote sensing products at a 250-m pixel resolution, estimates of theoretical biomass availability from harvest residues and fire-killed trees were co...
Article
Full-text available
Aboveground biomass yields of short rotation cultures (SRC) of willow can vary substantially depending on site quality. Among others, aboveground biomass yields depend on climatic conditions, soil properties, age of the SRC, and number of harvesting cycles. In this study, we investigated the effects of coppicing on growth variables (i.e., largest b...
Article
Fire is considered the major disturbance in boreal forests. Nonetheless, in several areas logging has become the primary driver of forest dynamics. In many areas of the boreal forest, stands may undergo paludification (i.e. the accumulation of thick, poorly decomposed organic layers over the mineral soil) in the prolonged absence of fire, which red...
Article
The occurrence of pesticides in groundwater represents an important health issue, notably for population whose drinking water supply source is located in agricultural areas. However, few solutions have been considered with regard to this issue. We tested the efficacy of a vegetal filtering system made of shrub willows planted at a high density (16...
Article
Full-text available
Paludification, the accumulation over the mineral soil of poorly decomposed organic matter mainly originating from Sphagnum spp., transforms black spruce (Picea mariana) boreal forests into forested peat-lands in the prolonged absence of fire, which diminishes forest productivity. High-severity wildfires reset this process by burning the soil organ...
Article
Background Successional paludification, a dynamic process that leads to the formation of peatlands, is influenced by climatic factors and site features such as surficial deposits and soil texture. In boreal regions, projected climate change and corresponding modifications in natural fire regimes are expected to influence the paludification process...
Article
In the North American boreal forest, the presence of aspen (Populus tremuloides Michx.) is thought to be constrained on sites where thick (>25 cm) soil organic layers (SOL) prevail. Aspen can reproduce both by seeds and suckers, but it is still unknown how SOL thickness influences both modes of reproduction. In this study, we sought to determine ho...
Article
Full-text available
A B S T R A C T Willow cropping is increasingly spreading worldwide for various purposes including vegetation filter. Willow plantations are highly nutrient-demanding and site fertilization may be required to maintain soil fertility and nutrient balance. In this context, municipal wastewater could be a valuable source of nutrients (especially N and...
Article
Forest inventory mapping is used worldwide to describe forests at a large spatial scale via the delimitation of portions of the landscape that are structurally homogeneous. Consequently, there is a significant amount of descriptive forest data in forest inventory maps, particularly with the development of ecosystem classification, which represents...
Article
Short-rotation intensive cultures (SRICs) of willows can potentially sequester carbon (C) in soil. However, there is limited information regarding the factors governing soil organic C (Corg) accumulation following afforestation. The objectives of this study were to: (i) determine whether willow leads to Corg accumulation in the topsoil (0–10 cm) tw...
Article
Globally, soils contain about 2000 Gt of carbon (C). Over the past centuries, however, land use has contributed to the release of about 140 Gt of C to the atmosphere. Nonetheless, the establishment of crops on marginal lands could reduce atmospheric C by accumulating it in soils. This study aimed to identify the effects of soil texture, land use hi...
Article
There are concerns about the effect of increasing resource extraction and other human activities on the soils and vegetation of the boreal zone. The review covers published papers between 1974 and 2012 to assess the effects of natural disturbances and human activities on soils and tree nutrition and growth of the Canadian boreal zone. Changes in so...
Article
The growing demand for bioenergy feedstock from forest harvest residues is generating concerns about the potential loss of site productivity through nutrient removal. We used tree-level national biomass equations and a national database of forest plots to develop stand-level biomass equations for the different tree components of 30 major forest tre...
Article
Although concerns have been raised that increased nutrient demand by fast growing tree species could deplete soil nutrient pools, recent research suggests that some species are able to obtain nutrients via soil mineral weathering. Hybrid poplars, which are fast growing and nutrient demanding species, are increasingly used in intensive silvicultural...
Chapter
Cet ouvrage collectif est le fruit du travail de près de 80 experts réunis pour présenter les connaissances en sylviculture les plus récentes applicables aux forêts du Québec. Ce savoir-faire moderne comprend non seulement les traitements les plus appliqués dans nos forêts, mais aussi des traitements sylvicoles novateurs, comme la coupe progressive...
Article
Hybrid poplar plantations were fertilized with hog manure at different manure supply rates for 6 years. In order to evaluate this practice in agricultural landscapes, we studied the effects of increasing manure supply on the growth and nutrition of three hybrid poplar clones and on soil solution chemistry at depths of 20 and 40 cm. More specificall...
Article
We established four experimental plantations to evaluate the main and interaction effects of timing (year of application) of mechanical release and stock type (containerized or bareroot) on the establishment success of large Picea glauca seedlings eight years after outplanting on high-competition sites in Quebec (Canada). We also monitored percent...
Data
Context Following forest harvest, mechanical site preparation (MSP) is commonly used to regenerate harvested sites. In boreal forested peatlands, however, the effectiveness of MSP to regenerate harvested sites is likely to be hampered by thick organic layers. Aim We sought to determine the capability of different MSP techniques to improve growth co...
Article
Full-text available
In boreal forested peatlands, we disturbed Sphagnum spp. and Pleurozium schreberi carpets to see how disturbance influenced substrate physico-chemistry, and growth and foliar nutrition of planted Picea mariana seedlings. Carpets were hand disturbed using gardening tools to a depth of approximately 25 cm. Carpet disturbance was aimed at disrupting o...
Article
Full-text available
Machinery traffic restrictions during forest harvest have been adopted to minimize soil damage and protect tree regeneration. However, this practice is questioned for paludifying black spruce (Picea mariana (Mill.) BSP) stands in which severe soil disturbance by wildfire restores forest productivity. The objective of this study was to determine, 8...
Article
Plant species distribution and plant community composition vary along environmental gradients. At the continental scale, climate plays a major role in determining plant distribution, while at the local and regional scales vegetation patterns are more strongly related to edaphic and topographic factors. The projected global warming and alteration of...
Article
Full-text available
2010. Contrasting effects of season and method of harvest on soil properties and the growth of black spruce regeneration in the boreal forested peatlands of eastern Canada. Silva Fennica 44(5): 799–813. It has been suggested that without sufficient soil disturbance, harvest in boreal forested peatlands may accelerate paludification and reduce fores...
Article
Ground-nest densities and nesting habits of 13 ant species were quantified in five postfire age classes (1, 9, 23, 47, and 79 yr old) in the lichen–spruce woodland of Quebec, Canada. There were no significant differences in ant nest densities between age-classes (average of 163 nests/ha), but there were significant differences in ant community stru...
Conference Paper
Background/Question/Methods The clay belt region of eastern Canada supports an important forest industry. In this region, black spruce stands are generally slow growing and frequently paludified, and are harvested by careful logging in order to minimize soil disturbance. Careful logging, by providing protection to soils, may contribute to a long-te...
Article
Through nest building and foraging activities, ants alter physical properties and nutritional status of soils through structural modifications and nutrient accumulation. In turn, these alterations may enhance soil quality for plant growth. This study examined the effect of the invasive red imported fire ant, Solenopsis invicta Buren, on soil proper...
Article
Ants appeared to be an important component of the soil fauna in azonal lichen-spruce woodland in southern Québec, but their role in nutrient distribution and vegetation dynamics remained unknown. A study was undertaken to compare physical, chemical, and microbial properties of nest mound soils to those of surrounding soils to test the hypothesis th...

Citations

... We combine these traits with estimates of dry wood density and sapwood specific hydraulic conductivity from the published literature to examine their covariation. To illustrate how uncertainty in these traits (user-defined parameters in the sap flow processing cascade) are propagated to daily transpiration estimates, we use an example dataset with heat ratio sap flow measurements from the Smartforests Canada monitoring network (Pappas et al., 2022) and we conduct a systematic sensitivity and uncertainty analyses. We hypothesize that: (1) taxonomic groups with different xylem porosity result in distinct sapwood allometry and thermal conductivity because of the coordination between tree water transport and resource allocation to water transport tissues, (2) axial sapwood thermal conductivity is higher for species with a higher hydraulic conductivity, due to the larger number of large and efficient water transporting tissues, and (3) the sensitivity of tree water use to the examined sapwood characteristics does not depend on species-specific xylem porosity. ...
... The central goal of this approach in North America and elsewhere is to maintain the natural variability of non-harvested stands for biodiversity and other ecosystem services in managed stands (Ameray et al., 2021;Brang et al., 2014;Seymour et al., 2002). Ecosystem-based management and the need to adapt forests to climate change stressors (Achim et al., 2022) frequently involve diversifying silvicultural treatments at the landscape level (Harvey et al., 2002;Royer-Tardif et al., 2021), including the implementation of standscale partial harvests (PH) (e.g., Kenefic et al., 2021;Nolet et al., 2014). PH encompasses a range of silvicultural treatments (e.g., commercial thinning, regular shelterwood, irregular shelterwood, selection cutting, retention forestry) that remove a portion of trees but retain others (Bose et al., 2014b;Montoro Girona et al., 2016;Thorpe and Thomas, 2007). ...
... Our findings suggest that forests containing old-growth conditions can be more resilient to climate change, including intensified disturbance impacts. This may require reconsidering current management practices and promote strategies such as Natural Dynamics Silviculture, which aims to emulate natural disturbance dynamics at several scales through silviculture manipulations (Drever et al., 2006;Kuuluvainen et al., 2021;Aszalós et al., 2022). ...
... Therefore, operators could be still not be fully skilled with the proper application of these machineries, as well as with the technical adjustments which can decrease soil damages (such as, for example, the application of bogie tracks or the placement of logging residues on the strip roads to decrease soil compaction) [12]. This highlights the need of increasing operators' skills concerning these modern machineries in Mediterranean context, suggesting the importance of the collaboration between forest researchers, technicians and operators, in implementing effective sustainable forest management [68,69]. ...
... There are two reasons accounting for this result. Firstly, density management can change stand structure and mother-culm numbers, affecting crop yields [29,30]. A reduction in the number of mother culms in a low-density stand will directly lead to a reduction in yield. ...
... Simulation modeling is an approach that can help better understand and quantify the effects of insect disturbance on forest C dynamics and compare C budgets between managed and unmanaged forests (Maleki et al., 2021). In this study, we used the TRIPLEX-Insect model (Liu et al., 2018) along with a geospatial forest database and 19 defoliation and management scenarios to perform a long-term evaluation of the impact of SBW defoliation on C dynamics in spruce-fir forests in Atlantic Canada. ...
... In boreal mixedwoods, in particular, partial harvest is considered a potential means of addressing the diminishing proportion of conifers to the benefit of intolerant hardwoods. Maleki et al. [11] investigated the matter and reported on a study comparing clearcutting and low-intensity partial cutting in regards to hardwood and conifer regeneration levels 7-19 years following treatments in trembling aspen (Populus tremuloides)-dominated stands of western Quebec, Canada. They observed that intolerant hardwood regeneration was positively linked with the amount of mature aspen prior to harvesting and increased with percent basal area reduction. ...
... representing most vegetation canopy conditions (e.g., sparse, dense) (Bacour et al., 2006;Houborg et al., 2007). The leaf inclination angle including planophile, spherical, uniform, plagiophile, erectophile, and extremophile types was depicted using average ALA, the range of which was determined by field dataset (Chianucci et al., 2018;Kattge et al., 2020;McNeil et al., 2016;Pisek and Adamson 2020;Raabe et al., 2015). The parameter ranges concerning leaf optical properties were set on the basis of the findings from Bacour et al. (2006), Baret et al. (2007), Campos-Taberner et al. (2016), (Féret et al., 2017), and Weiss and Baret (2016). ...
... In addition, deadwood supports multiple functions of the ecosystem including regeneration after disturbances [10], as well as carbon, nutrient, and hydrological cycles [11,12]. Deadwood can have a real impact on the microclimate [13,14]. ...
... In terms of their duration, disturbances may be broadly characterized as abrupt or gradual. While abrupt disturbances (e.g., fire, clear-cutting) typically lead to the rapid removal of both the canopy and the understory vegetation (Jean et al., 2019), the effects of gradual disturbances, such as insect attacks or disease outbreaks, are less severe and often create a heterogeneous mosaic of dead and living trees (Lausch et al., 2013). In the case of an abrupt disturbance, the severity is determined by the extent or force of the event and possibly by the environmental conditions (e.g., in the case of fire, by the topography, climate, and soil water content). ...