Augmentation du couvert en peuplier faux-tremble dans les pessières noires du nord-ouest du Québec après coupe totale

Laquerre, Simon; Leduc, Alain; Harvey, Brian D.

doi:10.2980/16-4-3252

Cited by 38 publications

(35 citation statements)

References 25 publications

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“…However, its presence in the more northerly black spruce forests of the claybelt region of Quebec and Ontario was likely restricted mostly to localized upland sites prior to large-scale industrial forest harvesting. While Chen and Wang (2006) found virtually no increase in hardwood density following group seed tree and careful logging in lowland black spruce forests of the Ontario claybelt, other studies in northeastern Ontario (Brumelis and Carleton 1988, Carleton and MacLellan 1994, Carleton 2000 and northwestern Quebec (Grondin et al 2003a, Laquerre et al 2009 confirm that aspen's northerly expansion into the black spruce forest is indeed occurring and is a relatively recent, industrially driven phenomenon.…”

Section: Introductionmentioning

confidence: 76%

“…While the extent of this recent local expansion has been variable, depending on the size and density of previous aspen patches and site factors (Laquerre et al 2009), it represents what could be the first wave of a more important forest cover transformation in the future. In effect, as this new landscape contains more aspen than 30 years ago, a longer-term transformation towards greater intolerant hardwood presence, possibly exacerbated by climate warming effects (Landhäusser et al (2010), is very likely if corrective measures are not taken.…”

Section: Implications For Managementmentioning

confidence: 99%

“…This latter information was obtained from more recent 1:20,000 forest ecosystem cover maps produced by the QMNRW (Grondin et al 2003b). Black spruce-dominated stands containing less that 25% cover of trembling aspen and situated on mesic to subhydric clay soils were selected because these sites were considered particularly susceptible to intolerant hardwood encroachment (Grondin et al 2003a, Laquerre et al 2009). The second set of aerial photos, part of the third decade inventory undertaken in the 1990s, illustrated the naturally regenerating cover following harvesting on these same sites.…”

Section: Selection Of Sites and Aerial Photosmentioning

confidence: 99%

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Spatial analysis of response of trembling aspen patches to clearcutting in black spruce-dominated stands

Laquerre¹,

Harvey²,

Leduc³

2011

The Forestry Chronicle

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While expansion of intolerant hardwoods, including trembling aspen, has been recognized as a problem by boreal forest managers in eastern Canada, the problem has mostly been associated with the boreal mixedwood and, with a few exceptions, the spatial aspects of the phenomenon have not been well documented in the scientific literature. The objective of this study is to evaluate how the density and size of aspen patches influence the change in density, size and persistence of patches following clearcutting of black spruce forests in the claybelt region of northwestern Quebec. To do this, we finely interpreted: 1) aerial photos taken between 1970 and 1979 of 12 mature black spruce-dominated stands containing varying sizes and densities of aspen patches prior to being clearcut harvested and 2) aerial photos taken between 1992 and 1995 of the 12 resulting clearcuts, 11 to 18 years after harvesting. Sketch maps of pre-and post-harvest aspen presence were rasterized and changes in aspen patch size and cover were determined. As well, the probabilities of aspen colonization with increasing distance from pre-harvest patches were calculated for each site. Black spruce forests of the claybelt containing no aspen prior to harvesting are relatively resistant to aspen invasion. However, when forests do contain aspen patches with cover values ≤25%, almost 60% of these patches increase to a higher density class. Aspen patches less than 2 ha in area had about a 50% probability of disappearing following clearcutting whereas larger patches had about a 96% chance of persisting as a result of clearcutting. In the black spruce forest of the claybelt, thick organic layers appear to have a negative effect on aspen recruitment. Distances of regenerating aspen from pre-harvest patches suggest that recruitment from seed is more important than previously thought.Key words: encroachment, trembling aspen, clearcutting, black spruce, claybelt, aerial photography RÉSUMÉ Dans la forêt boréale de l'Est du Canada, l'augmentation de la proportion de feuillus de lumière par rapport aux peuplements d' origine (enfeuillement), est reconnue comme un enjeu par les gestionnaires forestiers. Dans la littérature scientifique, l' enfeuillement a été associés essentiellement à la forêt mélangée et les aspects spatiaux du phénomène sont relativement peu documentés. L' objectif de cette étude était d' évaluer l'influence de la coupe totale sur la densité, la taille et la persistance des grappes de peuplier faux-tremble dans des forêts d' épinette noire de la ceinture d'argile du Nord-Ouest du Québec. Pour ce faire, nous avons interprété: 1) des photographies aériennes datant de 1970 à 1979 deiz pessières noires ponctuées de grappes de tailles et de densités variables de peuplier faux-tremble et 2) des photographies aériennes datant de 1992 à 1995 composées des mêmes 12 territoires forestiers, 11 à 18 ans plus tard suivant une coupe totale. Les croquis de cartes des présences pré-et post-récolte de peupliers ont été numérisés en format raster et les cha...

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Section: Introductionmentioning

confidence: 76%

Section: Implications For Managementmentioning

confidence: 99%

Section: Selection Of Sites and Aerial Photosmentioning

confidence: 99%

See 1 more Smart Citation

Spatial analysis of response of trembling aspen patches to clearcutting in black spruce-dominated stands

Laquerre¹,

Harvey²,

Leduc³

2011

The Forestry Chronicle

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“…Distance to the nearest main road (DistRoad) and agricultural area (DistAgri), as well as total road length per square kilometer within a radius of 15 and 25 km around the stand (DensRoad15Km and DensRoad25Km) was estimated and considered as proxies to control for the human effect on the natural environment. Anthropogenic disturbances change the landscape dynamics, acting at different scales of natural disturbances [47] particularly through fire occurrence (increased ignition sources). We know that changes in fire regimes as an interaction with forest harvesting have a direct impact on the composition and structure of forests [5,25].…”

Section: Predictive Variablesmentioning

confidence: 99%

“…Like stand-replacing fires, human activities naturally promote the establishment of shade-intolerant deciduous stands [47]. Distance to the nearest main road (DistRoad) and agricultural area (DistAgri), as well as total road length per square kilometer within a radius of 15 and 25 km around the stand (DensRoad15Km and DensRoad25Km) was estimated and considered as proxies to control for the human effect on the natural environment.…”

Section: Predictive Variablesmentioning

confidence: 99%

Conifer Recruitment in Trembling Aspen (Populus Tremuloides Michx.) Stands along an East-West Gradient in the Boreal Mixedwoods of Canada

Nlungu-Kweta

Leduc

Bergeron

2014

Forests

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Abstract:Ongoing climate change is likely to result in shifts in successional dynamics in boreal mixedwood stands. Using data from provincial forest inventory databases, we examined the occurrence and abundance of the regeneration of various coniferous species (white spruce, black spruce and balsam fir) along an east-west Canadian gradient in aspen-dominated stands. The interpretation of the results was based on environmental conditions, including climate, natural fire regime and human impacts. We found that conifer regeneration was present in aspen stands along the entire gradient, despite differences in climatic conditions and fire regimes between the west (warmer and drier, with large recurrent fires) and east (more humid with relatively long fire cycles). However, abundance and distribution varied from one conifer species to the next. The abundance of white spruce decreased towards the eastern end of the longitudinal gradient, while balsam fir and black spruce abundance decreased towards the west. Although abundance decreased, balsam fir and black spruce regeneration was still present in western Canada. This study shows that it is difficult to interpret the effects of climate change on conifer recruitment without accounting for the superimposed effects of human activities.

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The clonal root system of balsam poplar in upland sites of Quebec and Alberta

Adonsou

DesRochers

Tremblay

et al. 2016

Ecology and Evolution

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Balsam poplar seeds are short‐lived and require moist seedbeds soon after they are released to germinate. In addition to sexual reproduction, balsam poplar stands can regenerate clonally by root suckering. The origin of stands will in turn affect their genetic structure and root system architecture, which are poorly understood for upland forest stands. Three stands were hydraulically excavated in Quebec (moist) and Alberta (dry) to determine the origin of trees and to characterize root systems with respect to presence of parental roots and root grafts connections. Clones were identified using single‐nucleotide polymorphism (SNPs), and all stems, roots and root grafts were aged using dendrochronology techniques. All 82 excavated trees were of sucker origin, and four of the six stands contained a single clone. Parental root connections were found between 22% and 25% of excavated trees, and 53% and 48% of trees were linked with a root graft between the same or different clones, in Alberta and Quebec, respectively. Mean distance between trees connected by parental root was significantly lower than the distance between unconnected trees (0.47 ± 0.25 m vs. 3.14 ± 0.15 m and 1.55 ± 0.27 m vs. 4.25 ± 0.13 m) in Alberta and in Quebec, respectively. The excavations also revealed many dead stumps with live roots, maintained through root connections with live trees. This research highlights that balsam poplar growing in upland stands is a clonal species that can maintain relatively high genotypic diversity, with frequent root connections between trees at maturity. Maintaining an extensive root system through root connections increases the chances of a clone surviving when the above ground tree is dead and may also enhance the resilience of balsam poplar stands after disturbance.

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Augmentation du couvert en peuplier faux-tremble dans les pessières noires du nord-ouest du Québec après coupe totale

Cited by 38 publications

References 25 publications

Spatial analysis of response of trembling aspen patches to clearcutting in black spruce-dominated stands

Spatial analysis of response of trembling aspen patches to clearcutting in black spruce-dominated stands

Conifer Recruitment in Trembling Aspen (Populus Tremuloides Michx.) Stands along an East-West Gradient in the Boreal Mixedwoods of Canada

The clonal root system of balsam poplar in upland sites of Quebec and Alberta

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