Filip Havreljuk

Government of Quebec · Direction de la recherche forestière - Forest Research Branch

Stems of sugar maple (Acer saccharum Marsh.) and yellow birch (Betula alleghaniensis Britt.) trees often contain a column of discoloured wood known as red heartwood, which reduces lumber value. To quantify the regional-scale variation in red heartwood, 192 trees of each species were sampled in 12 locations across the temperate forest zone of southe...

The identification of low-vigor trees with potential for sawlog production is a key objective of tree marking guidelines used for partial cuts in northern hardwoods. The aim of this study was to measure the impact of various vigor-related defects on the monetary value of hardwoods. To achieve this, we sampled 64 sugar maple (Acer saccharum Marshall...

Silvicultural restoration measures have been implemented in the northern hardwoods forests of southern Quebec, Canada, but their financial applicability is often hampered by the depleted state of the resource. To help identify sites most suited for the production of high quality timber, where the potential return on silvicultural investments should...

The North American temperate deciduous forests are an important source of hardwoods sought after by the appearance wood products industries. The purpose of this study was to model the relationships between log characteristics and sawn board attributes in sugar maple (Acer saccharum Marsh.) and yellow birch (Betula alleghaniensis Britt.). We harvest...

The wood of sugar maple trees (Acer saccharum Marsh.) is generally perceived as containing more defects, such as dark heartwood and wood rot, at the northern limit of its range compared to southern locations; however, assessments of these internal defects have primarily relied on direct observation, limiting the scope of analysis. To enable large-s...

[English will follow] De 1995 à 1999, un réseau de suivi provincial a été établi pour mesurer les effets réels des coupes de jardinage exécutées dans les forêts du domaine de l’État. L’objectif était de vérifier si les hypothèses énoncées dans le Manuel d’aménagement forestier (MAF) relatives à la production se confirmeraient à la suite de l’applic...

The wood of sugar maple (Acer saccharum Marsh.) in the northernmost part of the species range often exhibits high proportions of discoloured wood at the centre of the stems, which is referred to as dark heartwood. This defect significantly decreases the wood market value of the species, which, in turn, challenges the implementation of state-of-the...

Sugar maple (Acer saccharum Marshall) growth in the species’ southern range has been declining since the 1980s, putting at risk a variety of ecosystem services that the species provides. Heatwaves, drought, frosts, acidic deposition, and insect defoliation, all reducing photosynthetic activity, have been suggested to be behind the phenomenon. Becau...

In the context of global change, a better understanding of the dynamics of wood degradation, and how they relate to tree attributes and climatic conditions, is necessary to improve broad‐scale assessments of the contributions of deadwood to various ecological processes, and ultimately, for the development of adaptive post‐disturbance management str...

Presentation of my PhD project to the annual meetings of the International Research Network (IRN) and the International Research Laboratory (IRL) on Cold Forests, as an active member of these research groups.

Improving financial revenues from partial cuts in sugar maple (Acer saccharum) stands at the northern edge of the species' range involves harvesting trees that have reached their financial maturity size (i.e., the diameter at which their monetary value is greatest and beyond which there is no further gain). To establish the lumber value of each tre...

Wood discoloration was investigated in 721 paper birch (Betula papyrifera Marsh.) trees from 146 sites across the managed forest of Quebec, Canada. Discoloration was present at breast height in 85% of trees, but its impact was limited in terms of tree basal area and volume, with proportions of 6.4% and 3.6%, respectively. These two measures were st...

Multinomial équations were parameterized to estimate initial stem quality and its evolution over time for the main broadleaf tree species of Québec, Canada.

La qualité des tiges feuillues est un élément particulièrement important à considérer lors de la planification de l'aménagement forestier puisqu'elle est directement liée à la qualité et à la valeur des billes et des produits transformés qui en découlent. La qualité des arbres étant influencée par la dimension des tiges et leur milieu de croissance...

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...

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...

Long-term success of forest management requires knowledge of standing tree characteristics and, an estimation of their evolution over time. In this study, hardwood stem quality was assessed using a specifically designed, non-destructive quality classification system that comprises four categorical output classes based on stem size and occurrence of...

The establishment of precise relationships between the characteristics of standing trees and log grade volumes would improve forest management decisions in hardwood stands. In this study, a two-part conditional model (to account for the excess of zero responses within certain log grades) was used as a framework to establish this relationship for so...

Temperate deciduous forests of southern Quebec are of great economic importance because they are the main supply source of the appearance wood products industries. However, the difficulty of linking the external characteristics of a tree to the internal quality of its wood creates supply-related uncertainties, since the quality of selected trees fo...

Forest planning currently depends on predictive models for selecting crop trees and estimating the volume yield per log grade even before harvest. Lumber valuation of each log is also possible; however, the predictive tool uses parameters that were set almost four decades ago, requiring a reassessment. The objective of this study was to improve the...