Yan Boucher

Yan Boucher
University of Québec in Chicoutimi | UQAC · Département des sciences fondamentales

For. eng. Ph.D. UQAM-UQAR
Professor of forest ecology and management and co-director of the CREB research center

About

78
Publications
21,070
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921
Citations
Citations since 2016
50 Research Items
712 Citations
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Introduction
I'm professor of forest ecology and management at the Université du Québec à Chicoutimi. My work focus on the impact of natural disturbances and forest management on structure, composition and growth of forest ecosystems. Je suis professeur en écologie et aménagement forestier à l'Université du Québec à Chicoutimi. Je m'intéresse à l'impact des perturbations naturelles et de l'aménagement sur la structure, la composition et la croissance des écosystèmes forestiers.
Additional affiliations
January 2021 - January 2024
Université Laval
Position
  • Professor (Associate)
Description
  • I co-supervise graduate students
January 2020 - January 2023
Université de Sherbrooke
Position
  • Professor (Associate)
Description
  • I co-supervise graduate students
December 2016 - March 2020
Université du Québec en Abitibi-Témiscamingue
Position
  • Professor (Associate)
Description
  • I co-supervise graduate students

Publications

Publications (78)
Article
Full-text available
Context Although logging has affected circumboreal forest dynamics for nearly a century, very few studies have reconstructed its influence on landscape structure at the subcontinental scale. Objectives This study aims to document spatiotemporal patterns of logging and fire since the introduction of logging in the early twentieth-century, and to ev...
Article
Full-text available
Our study aimed to: (1) document the preindustrial (1925) forest composition prior to extensive logging; (2) document the magnitude of changes from 1925 to 2005; and (3) identify the relative influence of logging and natural disturbances as drivers of the present-day forest composition. Boreal forest in central Quebec, eastern Canada. We used a den...
Article
Full-text available
Predicting future ecosystem dynamics depends critically on an improved understanding of how disturbances and climate change have driven long-term ecological changes in the past. Here we assembled a dataset of >100,000 tree species lists from the 19th century across a broad region (>130,000km²) in temperate eastern Canada, as well as recent forest i...
Article
Over the last century, forest management has modified the natural disturbance regime of temperate and boreal forest regions. Consequently, this new disturbance regime may have profoundly affected the structure, composition and associated carbon stocks of forest ecosystems. The aim of this study is to document structural and compositional changes (1...
Preprint
Full-text available
Increase in forest disturbance due to land use as well as climate change has led to an expansion of young forests worldwide, which affects global carbon dynamics and forest management. In this study, we present a novel method that combines a single airborne LiDAR acquisition and historical harvesting maps to model height growth of post-logged black...
Article
Full-text available
Clear-cutting is one of the most widespread forestry practices used in boreal forests. Clear-cutting of boreal forests in late successional stages could trigger reversion of successional trajectories back toward forests of earlier stages. Such successional setbacks could generate sustainability issues by prolonging the expected time to compositiona...
Article
The reproductive ecology of the semi-serotinous species black spruce (Picea mariana (Mill.) BSP) in northern boreal forests remains poorly understood. There is a general lack of data on cone / seed production and viability as a function of biotic tree-level characteristics and abiotic variables. No studies currently exist to quantify these differen...
Article
Full-text available
Background Tree-related microhabitats (hereafter, “TreMs”) are key components of forest biodiversity but they are still poorly known in North American hardwood forests. The spatial patterns of living trees bearing TreMs (hereafter, “TreM-trees”) also remain to be determined. As logging practices can lead to a loss of TreM-trees and of their associa...
Article
Full-text available
Significance Black spruce is the dominant tree species in boreal North America and has shaped forest flammability, carbon storage, and other landscape processes over the last several thousand years. However, climate warming and increases in wildfire activity may be undermining its ability to maintain dominance, shifting forests toward alternative f...
Article
Increase in forest disturbance due to land use as well as climate change has led to an expansion of young forests worldwide, which drives global carbon dynamics and timber allocation. This study presents a method that combines a single airborne LiDAR acquisition and time since harvest maps to model height growth of post-logged black spruce-dominate...
Technical Report
Full-text available
Mondialement, l’évaluation de la naturalité oppose généralement les forêts aménagées aux forêts jugées naturelles. Toutefois, le fait qu’une forêt soit aménagée ne signifie pas nécessairement qu’elle soit altérée. Ainsi, nous avons adapté ce concept pour produire un indicateur global, intégrateur et opérationnel en nous basant sur la variabilité de...
Article
One-quarter of forest areas worldwide are managed for forestry purposes. Depending upon the type of practice and intensity of management, forestry may alter forests to various degrees and raise sustainability issues. To mitigate the alteration of natural forests by forestry and to promote sustainability, ecosystem management has been implemented wi...
Article
Full-text available
Human activities have changed forest composition of northeastern North America since European settlement by increasing the importance of pioneer shade-intolerant species, at the expense of shade-tolerant and long-lived species. This study used tree taxa lists from land survey archives (1842–1935) to document the pre-settlement forest composition in...
Article
Full-text available
1. A better understanding of how disturbance impacts tree diversity at different scales is essential for our ability to conserve and manage forest ecosystems in the context of global changes. Here we test the impacts of land‐use related disturbances on tree diversity since the 19th century across a broad region (>150,000 km2) of northern temperate...
Article
Full-text available
How strong was the anthropogenic imprint in the disturbance regime of eastern Canadian mixed forests during the 20th century? And how did it alter the tree species composition? To answer these questions, we reconstructed the 20th century anthropogenic disturbance regime and analyzed its impact on modern forest composition using historical and moder...
Thesis
Full-text available
La gestion opérationnelle des forêts rend nécessaire la prédiction de la croissance des arbres après perturbation ou récolte sylvicole pour estimer la productivité à l’échelle du paysage. L’indice de qualité de site (IQS) est un des outils utilisés à cette fin, en prédisant une hauteur à 50 ans. Les perturbations majeures induisent un rajeunissemen...
Article
The impact of traditional even-aged forest management on landscape age structure, tree composition, and connectivity has been well documented. Very little, however, is known about the impact on stand structural diversity. This study aims to compare the structural and abiotic characteristics of forest stands disturbed by clearcut logging and by stan...
Article
Full-text available
How has European settlement of Eastern North America modified tree species assemblages?. The northern temperate forests of the Lower St. Lawrence region (Québec, Canada). Changes in relative prevalence of tree taxa were reconstructed with early land survey records (1821‐1900) and modern forest inventories (1980‐2010). Forest composition reconstruct...
Article
Full-text available
Satellite-derived spectral indices such as the relativized burn ratio (RBR) allow fire severity maps to be produced in a relatively straightforward manner across multiple fires and broad spatial extents. These indices often have strong relationships with field-based measurements of fire severity, thereby justifying their widespread use in managemen...
Poster
Full-text available
Les peuplements sont majoritairement naturels. Le dernier siècle d’opérations forestières industrielles n’a pas altéré leur composition de façon significative. Les paysages sont majoritairement semi-naturels. Le rajeunissement de la matrice forestière causé par les opérations forestières industrielles du dernier siècle est ce qui a le plus altéré...
Poster
Full-text available
Affiche présentée lors du concours d’affiches universitaires Gustave-Clodomir-Piché, lors du Carrefour Forêt 2019 (MFFP)
Poster
Full-text available
La récurrence des feux ainsi que la productivité relativement faible des forêts situées dans la portion nordique de la forêt boréale conditionnent la capacité d'y produire du bois de manière durable. Notre connaissance des régimes de feu nous montre qu'il est hautement probable que des quantités significatives de bois brûleront au cours des prochai...
Presentation
Full-text available
Présentation de la réalisation du projet, de résultats préliminaires et de perspectives relatives à l'utilisation du LiDAR en foresterie au Québec.
Article
Full-text available
Context Forest landscapes at the boreal–temperate ecotone have been extensively altered. Reducing the gap between current and presettlement forest conditions through ecosystem-based forest management (EBFM) is thought to enhance ecological integrity. However, climate change may interfere with this goal and make these targets unrealistic. Objective...
Technical Report
Full-text available
Avis technique portant sur les peuplements à cibler comme forêt résiduelle en fonction de la densité de régénération après feu dans la région Nord du Québec dans un contexte de plan de récupération des bois brûlés.
Article
Full-text available
Background In the context of ecosystem management, the present study aims to compare the natural and the present-day forested landscapes of a large territory in Quebec (Canada). Using contemporary and long-term fire cycles, each natural forest landscape is defined according to the variability of its structure and composition, and compared to the pr...
Poster
Full-text available
L’aménagement écosystémique vise à diminuer les écarts entre forêts aménagées et naturelles, et doit s’appuyer sur des états de référence représentant les caractéristiques des forêts naturelles. Nous proposons d’utiliser la principale source d’information sur la composition de la forêt préindustrielle du sud du Québec, les archives d’arpentage, pou...
Poster
Full-text available
Dans un contexte de changements globaux, les évènements naturels extrêmes tel que les feux de forêt augmenteront et s'intensifieront (en fréquence et en sévérité), modifiant ainsi la composition et la structure de la forêt boréale canadienne. Ces changements écologiques drastiques risquent d'avoir des impacts majeurs sur la productivité de la forêt...
Poster
Full-text available
Au Québec, le nouveau régime forestier vise à mettre en place un aménagement forestier écosystémique (RLRQ, c. A-18.1, article 1). Pour réussir, l’implantation de ce paradigme d’aménagement forestier durable doit être soutenue par la science. Il est primordial de vérifier les hypothèses sur lesquelles les aménagistes appuient leurs décisions pour g...
Presentation
Full-text available
In a context of global climate change, natural extreme events such as forest fires will increase and intensify (in frequency and severity) while modifying the composition and structure of the Canadian boreal forest. Such drastic changes will have major impacts on the boreal forest productivity. The work presented here is within the framework of a n...
Technical Report
Full-text available
De 2005 à 2010, près de 1,7 million d’hectares de forêts ont été brûlés au Québec. Une vaste proportion de ces peuplements ont nécessité des travaux de remise en production. Présentement, d’après des études fragmentaires qui indiquent que les jeunes forêts dominées par l’épinette noire ont un faible potentiel de régénération, les pessières âgées de...
Research
Full-text available
Le phénomène du déclin de l’érable à sucre jumelé à celui de la prolifération du hêtre à grandes feuilles dans les érablières soulève de nombreuses questions et inquiète les aménagistes. En réponse à ce besoin de connaissances, la Direction de la recherche forestière du ministère des Forêts, de la Faune et des Parcs du Québec a constitué un comité...
Article
Clearcutting practices combined with the predicted increase in fire activity may induce post-fire regeneration failure in boreal forest landscapes. This study aims (1) to evaluate if recently managed landscape by clear cut logging is susceptible to be affected by post-fire regeneration failure; and (2) to explore the ecological drivers of black spr...
Article
Eastern white cedar (Thuja occidentalis L.) has been identified as a target tree species for ecological restoration in northeastern North America. Insight into long-term population dynamics since preindustrial times is key to guiding restoration efforts. In this study, we used a large set of early land survey data to assess the status of eastern wh...
Technical Report
Full-text available
Les forêts de feuillus du Québec ont une grande importance économique. La valeur marchande d'un arbre dépend de sa dimension et de son apparence, lesquels déterminent le potentiel d'utilisation de son bois. Il importe de connaître la répartition du volume et la qualité du bois à l'intérieur d'un arbre pour satisfaire aux demandes des transformateur...
Technical Report
Full-text available
Bien que les feux et les coupes soient les perturbations majeures au sein de la forêt boréale, peu d’études ont jusqu’à maintenant quantifié leur importance de même que leur impact sur la structure des paysages. Afin d’y parvenir, nous avons dressé le bilan des superficies touchées par les feux et les coupes depuis le début du 20e siècle, sur une v...
Article
Full-text available
Abstract Context Although logging has affected circumboreal forest dynamics for nearly a century, very few studies have reconstructed its influence on landscape structure at the subcontinental scale. Objectives This study aims to document spatiotemporal patterns of logging and fire since the introduction of logging in the early twentieth-century, a...
Technical Report
Full-text available
Forest age structure, which is defined as the relative abundance of stands that belong to different age classes, is a major attribute of temperate forest landscapes. It varies in time and space, mostly according to the natural disturbance regimes which characterize the different ecosystems. The observed variability in the relative abundance of diff...
Article
Full-text available
Forest plantations are recognized as a silvicultural tool for ensuring a timber supply that meets public expectations regarding sustainable forest management. However, they are also part of the silvicultural scenario that shows the greatest potential for the artificialization of natural forests. From a firsthand perspective, intensive plantation si...
Article
Full-text available
QuestionsDo early land survey records of the ‘line description’ type allow accurate reconstructions of pre-settlement forest composition? Did surveyors record all tree taxa in forest stands encountered along the surveyed lines? Were taxa ranked according to their relative importance in forest stands? What criteria did surveyors used to rank taxa in...
Article
Full-text available
Les plantations forestières représentent un outil sylvicole reconnu pour assurer un approvisionnement en matière ligneuse qui répond aux attentes de la société envers l’aménagement durable des forêts. Toutefois, elles font aussi partie du scénario sylvicole qui a le plus grand potentiel d’artificialisation de la forêt naturelle. Les objectifs de la...
Article
Full-text available
Forest plantations are recognized as a silvicultural tool for ensuring a timber supply that meets public expectations regarding sustainable forest management. However, they are also part of the silvicultural scenario that shows the greatest potential for the artificialization of natural forests. From a firsthand perspective, intensive plantation si...
Article
Full-text available
Land use history has altered natural disturbance dynamics, causing widespread modifications of the earth’s forests. The aim of this study is to reconstruct a regional, spatially-explicit, fire and logging history for a large southern boreal forest landscape (6,050 km2) of eastern Canada. We then examined the long-term influence of land use history,...
Conference Paper
Full-text available
Background / Purpose: More than 100 years of timber production in the Lower St. Lawrence region of eastern Canada have modified the structure and composition of regional forests. During the 20th century, old uneven-aged and conifer-dominated forest communities were progressively replaced by young shade-intolerant stands. However, a precise evalua...
Conference Paper
Full-text available
Background / Purpose: Historical land-use practices have changed natural disturbance dynamics, causing widespread modifications in species composition of the earth’s forests. Over the last two centuries, at the interface of boreal and temperate forests of north America, escaped settlement fires and industrial logging have altered the frequencies...
Article
Full-text available
The introduction of logging associated with the industrial era (since ∼1900) has modified the natural disturbance regime of the world’s boreal forests. The object of this study was to document, using forestry maps prepared in 1950 and 2005 from air photos, the dynamics of high-elevation boreal forest landscapes affected by 20th century logging and...
Article
Full-text available
Worldwide, old-growth forest loss and fragmentation resulting from logging are considered major threats to biodiversity. In many regions of the boreal zone, remaining patches of old-growth forests left following logging are restricted to small areas exposed to edge effects. Our objectives were to evaluate, from a literature review, the distance of...
Technical Report
Full-text available
Le registre des états de référence : portrait des forêts naturelles pour établir des cibles d'aménagement écosystémique.
Technical Report
Full-text available
The age structure and species composition of preindustrial forest landscapes are key reference characteristics required to implement ecosystem-based management (EBM) targets. The Ministère des Ressources naturelles et de la Faune (MRNF) has done major work to gather and analyse information to create a “reference conditions registry”, which presents...