Root-system morphology of common boreal forest trees in Alberta, Canada

Strong, Wayne L; Roi, George H. La

doi:10.1139/x83-155

Cited by 167 publications

(79 citation statements)

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“…Another explanation is possible for the different responses if below-ground competition is considered. The roots of sera1 boreal species, such as jack pine and trembling aspen, exploit primarily the mineral horizons, while those of later successional species, such as black spruce, are concentrated in organic layers (Strong and La Roi 1983). Since the main competing species in this study was trembling aspen, jack pine may have encountered more root competition than black spruce at a given above-ground competition index.…”

Section: (C) Relative Growth Ratesmentioning

confidence: 81%

Functional growth analysis of conifer seedling responses to competing vegetation

MacDonald¹,

Weetman²

1993

The Forestry Chronicle

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A modification of functional growth analysis is proposed for Une modification de l'analyse fonctionnelle de la croissance investigating the responses of conifer seedlings to vegetative est proposCe B des fins de recherche sur le comportement des competition. The approach permits detailed comparisons of the semis de coniferes face B la cornpitition de la v6gCtation. absolute growth and relative growth rate with respect to com-L'approche permet des comparaisons dCtaillCes du taux de croispetition level between crop species and between stock types. sance absolue et de croissance relative selon le niveau de comIn this study, jack pine (Pinus banksiana Lamb.) demonstrated pCtition entre deux espbces d'arbres et deux types de plants. Dans greater height and diameter growth than black spruce (Picea cette Ctude, le pin gris (Pinus banksiana Lamb.) a dCmontr6 une mariana (Mill.) B.S.P.) across the range of competition.croissance en hauteur et en diambtre plus importante que However, competition had a larger negative impact on relative 1'Cpinette noire (Picea mariana (Mill.) B.S.P.) et ce B tous les growth rate for jack pine. The absolute growth and relative niveaux de compCtition. Toutefois, la compCtition a eu un impact growth rate were greater for bare root stock than for container nCgatif plus grand sur le taux de croissance relative du pin gris. stock, indicating that the effects of initial size differences between Le taux de croissance absolue et de croissance relative a 6tC plus the stock types remained four years after planting. In all cases, important pour les semis B racines nues que pour les semis en the negative effect on seedling growth of each unit of competicontenant, dtmontrant que les effets des diffirences initiales de tion diminished as the competition intensity increased.taille entre les types de plantes se maintenaient quatre annCes A practical application of functional growth analysis is sugaprbs la plantation. Dans tous les cas, l'effet nCgatif de chaque gested to assist free-to-grow assessments in plantations. The unit6 de compCtition sur la croissance des semis diminuait h underlying functions would be developed separately for each mesure que I'intensitC de la compCtition augmentait. ecological site type encountered, and would use root collar Une application pratique de l'analyse fonctionnelle de la croisdiameter increment to assess seedling potential. With the funcsance est suggCr& afin d'aider B I'Cvaluation de la comp6tition dans tions entered into a programmable calculator, field crews could les plantations. Les fonctions sous-jacentes seraient Babor&s indirapidly obtain the required competition measurements, apply the viduellement pour chaque site kologique Ctudi6, et utiliserait I'augfunctions, and make tending decisions. mentation du diambtre au collet pour Cvaluer le potentiel du semis. Une fois les fonctions introduites dans une calculatrice prograrnKey words: Relative growth rate, competition threshold, vegemable, les &pipes sur le terrain pourraient rapidement obtenir les tation managem...

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Section: (C) Relative Growth Ratesmentioning

confidence: 81%

Functional growth analysis of conifer seedling responses to competing vegetation

MacDonald¹,

Weetman²

1993

The Forestry Chronicle

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“…Model inputs for rooting depths for each land cover were based on published values (Strong and La Roi 1983, Jackson et al 1996.…”

Section: Parameterization Of the Acru Modelmentioning

confidence: 99%

Multi-variable verification of hydrological processes in the upper North Saskatchewan River basin, Alberta, Canada

Nemeth¹,

Kienzle

Byrne

2012

Hydrological Sciences Journal

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The ACRU agro-hydrological modelling system was set up to simulate the impacts of climate change on the hydrological responses of the 3856-km 2 Cline River watershed, the major headwater of the upper North Saskatchewan River basin in central Alberta, Canada. The physical-conceptual ACRU model was set up to simulate all elements of the hydrological cycle on a daily time step for the 1961-1990 baseline period, to serve as the basis for later climate change impact simulations. After parameterization, the output from the ACRU model was verified against temperature, snow water equivalent, glacier mass balance, potential evapotranspiration, and two sets of long-term daily streamflow records. The multi-variable verification analyses were implemented to instil confidence that the simulated streamflow time series is based on a realistic combination of bio-physical parameters and represents the watershed behaviour in terms of annual water yields, seasonality, shape and magnitude of the hydrographs, and streamflow variability.Key words hydrological simulation model; streamflow; snow; glacier; verification; ACRU model; Canada Vérification multi-variable des processus hydrologiques dans le bassin supérieur de la rivière North Saskatchewan, Alberta, Canada Résumé Le système de modélisation agro-hydrologique ACRU a été mis en place pour simuler les impacts des changements climatiques sur les réponses hydrologiques du bassin versant de la Rivière Cline (3856 km 2 ), source majeure du bassin supérieur de la rivière North Saskatchewan dans le centre de l'Alberta, au Canada. Le modèle physique-conceptuel ACRU a été mis en place pour simuler tous les éléments du cycle hydrologique au pas de temps journalier pour la période de référence 1961-1990, pour servir de base à des simulations ultérieures des impacts des changements climatiques. Après le paramétrage, les sorties du modèle ACRU ont été vérifiées sur la température, l'équivalent en eau de la neige, le bilan de masse des glaciers, l'évapotranspiration potentielle, et deux enregistrements de long terme de débits quotidiens. Les analyses de vérification multi-variables ont été mises en oeuvre pour s'assurer que la série des débits simulés est basée sur une combinaison réaliste de paramètres biophysiques et représente le comportement du bassin versants en termes d'écoulement annuel, de saisonnalité, de forme et d'ampleur des hydrogrammes et de variabilité du débit.

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“…Root linkage through mycorrhizal fungi has also been shown to decrease competition between different species and increase yields in mixture (Peny et al 1992). Root excavations in Alberta have indicated different rooting patterns between aspen and spruce; white spruce fine roots are generally within 50 cm depth while many aspen fine roots can reach 100 cm depth (Strong and La Roi 1983). White spruce lateral roots are concentrated in the organic soil layers whereas aspen lateral roots are usually confined to mineral soil horizons (Strong andLa Roi 1983, Kabzems andLousier 1992 …”

Section: ) Reduction Of Root Competitionmentioning

confidence: 99%

Are mixtures of aspen and white spruce more productive than single species stands?

Man¹,

Lieffers²

1999

The Forestry Chronicle

156

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e f f e r s~In boreal mixedwood forests, aspen (Populus tremuloides) and Des les forets melangees boreales, le tremble (Populus tremuwhite spruce (Picea glauca) commonly grow in mixture. These loides) et l'epinette blanche (Picea glauca) poussent souvent en species may avoid competition through differential shade tolerassociation. Ces especes peuvent probablement eviter d'etre en ance, physical separation of canopies, phenological differences, competition par une tolerance differentielle a l'ombre, par une sep successional separation, and differences in soil resource utilizaaration de l'etage des cimes, par des differences phenologiques, tion. Aspen may also be able to positively affect the growth of white par une separation successionne11e, et par des differences dans l'utilspruce by improving litter decomposition and nutrient cycling rates, isation des ressources pedologiques. Le tremble peut egalement controlling grass and shrub competition, ameliorating environaffecter positivement la croissance de l'epinette en ameliorant mental extremes, and reducing pest attack. These positive relala decomposition de la litiere et les cycles des elements, en contionships likely make mixedespecies stands more productive trolant la competition herbacee et arbustive, en uniformisant les than pure stands of the same species. The evidence regarding the extremes en~ir~Ilnementaux, et en reduisant les attaques d'agents productivity of pure versus mixed aspen/white spruce stands in ravageurs. Cette relation positive semble rendre les peuplements natural unmanaged forests is examined in this paper.d'especes melanges plus productifs que les peuplements purs composes d'une seule espece. L'evidence de la productivite des K~~ T~ mixm; productivity; boreal mixedW&; peuplements purs par rapport aux peuplements melanges tremwhite spruce blelepinette dans les forets naturelles non-amenagees est etudiee dans cet expose.

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Root-system morphology of common boreal forest trees in Alberta, Canada

Cited by 167 publications

References 0 publications

Functional growth analysis of conifer seedling responses to competing vegetation

Functional growth analysis of conifer seedling responses to competing vegetation

Multi-variable verification of hydrological processes in the upper North Saskatchewan River basin, Alberta, Canada

Are mixtures of aspen and white spruce more productive than single species stands?

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