Compétition pour le rayonnement solaire en début de succession secondaire dans une érablière à bouleau jaune et hêtre

Bellefleur, Pierre; LaRocque, G.

doi:10.1139/x83-076

Cited by 9 publications

(3 citation statements)

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“…It is possible, however, that at higher light levels as found in clearcut areas that below-ground competition may occur. This concurs with results reported in several other studies done in the same area [3,5,6]. However, the overall lack of responsiveness of our three species contradicts many studies that have found significant effects of understory vegetation and belowground competition exclusion treatment [17,18,40,41,48,56].…”

Section: Discussionsupporting

confidence: 91%

Do understory sapling respond to both light and below-ground competition?: a field experiment in a north-eastern American hardwood forest and a literature review

et al. 2003

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-A study was initiated in 1993 to evaluate the potential effects of both above-and below-ground competition exclusion on yellow birch (Betula alleghaniensis Britton), sugar maple (Acer saccharum Marsh.) and American beech (Fagus grandifolia Ehrh.) sapling growth along an understory light gradient ranging from 3% to 50% of full sunlight. We compared four different growth variables between a control and a treatment (trenching and manual removal of nearby vegetation). Height growth, diameter growth, height over stem diameter ratio, and crown area varied with light availability in all three species, whereas trenching treatment had no significant effect. Our results show that light is the main factor affecting understory sapling growth following a selection cut in this northern hardwood forest, at least up to 50% full sunlight. The unresponsiveness of these three species to below-ground competition is discussed in relation to a literature review in which both soil richness and species functional ecology are considered. above-and below-ground competition / growth / light / northern hardwood species / trenchingRésumé -Les gaulis en sous couvert répondent-ils à la fois à une compétition en dessous et au-dessus du sol ? Une expérience en forêt feuillue du Nord-Est de l'Amérique et une revue de littérature. En 1993, une étude a été entreprise afin de déterminer les effets éventuels de l'élimination de la compétition souterraine sur la croissance de gaulis de bouleau jaune (Betula alleghaniensis Britton), d'érable à sucre (Acer saccharum Marsh.) et de hêtre à grandes feuilles (Fagus grandifolia Ehrh.) se trouvant sous un gradient de lumière allant de 3 % à 50 % du rayonnement solaire total. Quatre paramètres de croissance ont été comparés entre des gaulis témoins et des gaulis traités (création d'une tranchée et enlèvement manuel des tiges avoisinantes). Pour les trois espèces, les croissances en hauteur et en diamètre, le ratio hauteur sur diamètre de la tige et la surface de cime ont varié avec la disponibilité en lumière, alors que l'élimination de la compétition n'a eu aucun effet. Nos résultats suggèrent donc que la lumière est le principal facteur limitant la croissance des gaulis en sous-couvert après une coupe de jardinage dans cette forêt feuillue tempérée, au moins jusqu'à 50 % de pleine lumière. La faible réponse des trois espèces à l'élimination de la compétition est discutée à partir d'une revue de littérature dans laquelle la fertilité des sols et le comportement écologique des espèces sont comparés. compétition au-dessus et en dessous du sol / croissance / lumière / espèces feuillues tempérées / élimination de la compétition souterraine

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Section: Discussionsupporting

confidence: 91%

Do understory sapling respond to both light and below-ground competition?: a field experiment in a north-eastern American hardwood forest and a literature review

et al. 2003

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“…5). Bellefleur and Larocque (1983b) noted that survival was best among YB seedlings with heights greater than that of the interfering vegetation, suggesting that the critical height for YB seedlings is not absolute but relative to the interfering vegetation.…”

Section: Survivorship Of the Initial Cohort Of Yb Seedlingsmentioning

confidence: 99%

Establishment, survivorship, and growth of yellow birch seedlings after site preparation treatments in large gaps

Lorenzetti

Delagrange

Bouffard³

et al. 2008

Forest Ecology and Management

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“…Etiolation clearly allowed saplings in the NC and, to some extent, in the TS treatments to exhibit similar height growth to saplings in more severe vegetation control treatments. Betula alleghaniensis' ability to preferentially invest in height versus diameter growth has previously been reported as a mechanism of response to competition for light (Bellefleur & Laroque 1983;Delagrange et al 2004), which is critical in these types of forest (Ricard et al 2003). However, maximizing height growth might be conducive to lower overall sapling vigor, especially over a prolonged period of time.…”

Section: Sapling Response To Vegetation Control Treatmentmentioning

confidence: 99%

Vegetation Control Treatments to Favor Naturally RegeneratedBetula alleghaniensisSaplings Following Seed‐Tree Cut: Sapling Monitoring Two Years after Treatment

Bouffard¹,

Nolet²,

Delagrange

et al. 2007

Restoration Ecology

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Control of competing vegetation is recommended to ensure successful Yellow birch (Betula alleghaniensis Britton) regeneration within juvenile stands that do not sustain high enough sapling densities of this species. Four contrasting vegetation control treatments were tested to determine their effect on the growth and vigor of eightyear-old B. alleghaniensis saplings regenerating after final cutting of a shelterwood seed cut. Vegetation control treatments were TC (total circular removal), PC (circular removal of codominant competing vegetation), TS (total semicircular removal on 180°section), and NC (no vegetation control). Two years after treatment application, diameter growth significantly improved in response to vegetation control treatments, whereas sapling height growth did not. This pattern of biomass allocation was directly related to sapling etiolation, which increased with decreasing severity of vegetation removal. As a result, application of vegetation control, especially TC and PC treatments, was valuable in reducing signs of stress in saplings. However, increasing the severity of vegetation removal also made saplings more conspicuous to herbivores, which increased browsing, especially in the TC and PC treatments. Browsing was sufficient in some plots of the TC and PC treatments to overcome the vigor and diameter growth enhancements observed when browsing was negligible. In contrast to the TC and PC treatments, the TS treatment kept browsing very low while largely removing competition. The results suggest that B. alleghaniensis saplings established after final cutting of a shelterwood seed cut do take advantage of vegetation control treatments, but the decision to apply these treatments must include consideration of local herbivore population densities.

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Compétition pour le rayonnement solaire en début de succession secondaire dans une érablière à bouleau jaune et hêtre

Cited by 9 publications

References 0 publications

Do understory sapling respond to both light and below-ground competition?: a field experiment in a north-eastern American hardwood forest and a literature review

Do understory sapling respond to both light and below-ground competition?: a field experiment in a north-eastern American hardwood forest and a literature review

Establishment, survivorship, and growth of yellow birch seedlings after site preparation treatments in large gaps

Vegetation Control Treatments to Favor Naturally RegeneratedBetula alleghaniensisSaplings Following Seed‐Tree Cut: Sapling Monitoring Two Years after Treatment

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