Comparaison du volume et de la valeur des bois résineux issus d’éclaircies par le bas et par dégagement d’arbres-élites dans l’Est du Canada

Gagné, Laurent; Sirois, Luc; Lavoie, Louis

doi:10.1139/cjfr-2015-0395

Cited by 8 publications

(3 citation statements)

References 24 publications

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“…In the province of Quebec, ecosystem-based management must now be carried out, even in plantations (Barrette et al 2014). This has brought forest managers to propose, among other things, new thinning methods such as selective thinning (Gagné et al 2016). The final objective of this type of thinning is to convert the stands into uneven-aged/irregular structures (Schütz 2001;Schütz 2002).…”

Section: Discussionmentioning

confidence: 99%

Quantifying competition in white spruce (Picea glauca) plantations

Bérubé-Deschênes

Franceschini

Schneider

2017

Annals of Forest Science

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& Key message In mixed forest plantations in sub-boreal forests with high levels of natural regeneration ingrowth, competition must be quantified differently for each species, with distant-independent indices working better for the planted species and distant-dependent indices for ingrown balsam fir. Although broadleaved competition hinders growth of coniferous species more than coniferous competition, the differentiation between clades is not important enough to improve growth predictions. & Context The use of ecosystem-based forest management has changed how forest stands are tended. This shift in the management paradigm has led to a higher tolerance in natural ingrowth regeneration in plantations. The correct way of quantifying competition must thus be assessed to develop growth simulators. & Aims An individual tree relative basal area increment (RBAI) growth model for white spruce, balsam fir and other coniferous and broadleaved species was calibrated. & Methods Using data obtained from 94 sample plots in 48 white spruce plantations from Eastern Quebec, we considered both linear and nonlinear models of RBAI as a function of site index, tree size and tree competition. The tested distancedependent and distance-independent indices were also discriminated according to competitor clade (conifers or broadleaves). & Results The best competition index for balsam fir was distance-dependent whereas a distant-independent one was retained for the other species groups. Moreover, broadleaved competitors had stronger effect on RBAI for white spruce growth when compared to coniferous competitors. & Conclusion Competition must be quantified depending on if the species is planted or ingrown. However, dividing competition into clades (i.e. coniferous versus broadleaved) is not necessary, at least in the present study.

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Section: Discussionmentioning

confidence: 99%

Quantifying competition in white spruce (Picea glauca) plantations

Bérubé-Deschênes

Franceschini

Schneider

2017

Annals of Forest Science

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“…A total of 66 sample plots were used to model tree spatial distribution. These plots are part of 2 commercial thinning trials that compare various treatments (TrT): a thinning from below (TrT 1/3 ), in which the smallest trees were cut while ensuring equal spacing between the remaining trees; a crop tree release thinning (TrT CT ), in which the competition was removed 3 m around either 50 or 100 dominant trees per hectare [41]; and a thinning with priority selection of balsam fir (TrT BF ), in which all balsam fir trees were harvested. Both experiments also included an untreated control (TrT 0 ).…”

Section: Study Sitementioning

confidence: 99%

Modelling the Spatial Structure of White Spruce Plantations and Their Changes after Various Thinning Treatments

Duchâteau

Schneider

Tremblay

et al. 2021

Forests

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Research Highlights: The spatial distribution of trees results from several ecological processes that can be difficult to measure. We applied a point process modelling approach that uses the diameter and species of neighbouring trees to represent inter-tree interactions through repulsive and attractive processes. Thinning treatments slightly influence the tree spatial distribution of trees in white spruce plantations. Integrating this “spatialiser” into growth models could help improve stand simulations following various thinning treatments over larger areas and longer periods. It could also allow for the use of spatially explicit models when tree position is not available. Background and Objectives: Tree spatial patterns result from several ecological processes and have important implications in forest ecology and management. The use of spatial information can significantly improve our understanding of forest structures. However, this implies intensive field work that is rarely integrated into forest inventories. The aims of this study were to develop a spatial distribution simulator of trees in white spruce plantations and to evaluate the influence of thinning treatments. Materials and Methods: A point process modelling approach was used to represent inter-tree interactions through repulsive and attractive process in white spruce (Picea glauca (Moench) Voss) plantations in eastern Quebec, Canada, that had been commercially thinned five years ago. Balsam fir (Abies balsamea (L.) Mill.) and hardwoods together can represent 30–40% of the basal area of these plantations. Results: The diameter and species of each tree’s two closest neighbours were found to be the most important predictors in explaining the observed distances between trees. Despite the short period since thinning treatments, results showed that the treatment had slight significant effects on tree interactions. However, their impact on the global spatial distribution of stands is quite limited. Conclusions: Using only a few readily-available variables (species and diameter of trees), this “spatialiser” will make it possible to assign spatial coordinates to trees and generate realistic stand spatial structures even after various silvicultural treatments.

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“…Thinning from below and of dominants narrow the range of diameter and height distributions and decrease canopy stratification due to the preferential removal of trees with smaller and larger dimensions, respectively [52]. Thinning from above and of Schädelin keep the range of diameter and height distributions and maintain or increase canopy stratification [20,39,52,56,57]. Compensation and crown releasing, free and mechanical thinnings tend to keep diameter and height distribution ranges and canopy stratification [6,7,23].…”

Section: Thinning Effectsmentioning

confidence: 99%

Thinning: An Overview

Gonçalves¹

2021

Silviculture

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Thinning is one of the primordial silvicultural practices. It has been analysed by its methods and intensities, associated to the tree selection criteria. Yet, while some methods are of generalised use, others were developed for specific purposes. The goal of this review is to compile the existing information regarding tree selection, thinning methods and intensity as well as their effects on trees and stands. The effects of thinning indicate a reduction of density and a trend towards an increase of growth rates at tree level for a short time after thinning. Biomass and volume show similar or smaller values when compared to unthinned stands. Mortality and growth stagnation, especially in stands with low stability or vigour, can also occur. The modifications in stand structure can enhance its role as an adaptive measure.

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Comparaison du volume et de la valeur des bois résineux issus d’éclaircies par le bas et par dégagement d’arbres-élites dans l’Est du Canada

Cited by 8 publications

References 24 publications

Quantifying competition in white spruce (Picea glauca) plantations

Quantifying competition in white spruce (Picea glauca) plantations

Modelling the Spatial Structure of White Spruce Plantations and Their Changes after Various Thinning Treatments

Thinning: An Overview

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