Lodgepole pine growth as a function of competition and canopy light environment within aspen dominated mixedwoods of central interior British Columbia

Harper, George J.; O’Neill, Meghan; Fielder, Peter; Newsome, Teresa A.; DeLong, Craig

doi:10.1016/j.foreco.2009.02.005

Cited by 8 publications

(6 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This was expected since plots were chosen across a range of increasing levels of aspen competition and strong negative associations between the two species have been reported previously (Newsome et al 2008, Harper et al 2009). A similar negative growth association has been shown between jack pine (Pinus banksiana) and aspen (Kenkel 1994).…”

Section: Discussionmentioning

confidence: 93%

“…Much research has focused on understanding and predicting the response of pine to the range of light environments within aspen-pine mixedwoods (Landhausser and Lieffers 2001, Claveau et al 2005, Harper et al 2009). Research has shown pine height and diameter growth increase in a linear fashion with increases in light availability and, diameter growth has been found to respond to reductions in competition levels more quickly than height growth (MacIsaac and Navratil 1996, Wright et al 1998, Coates 2000, Newsome et al 2003.…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, lower competition levels have been found to influence diameter increment more than height increment (Newsome et al 2003, Strong and Sidhu 2005, Newsome et al 2010. Published studies from seven SBS sites indicate a positive pine diameter growth response to aspen removal treatments (Lange et al 2004, DeLong 2007, Newsome et al 2008, Harper et al 2009). Height growth response to aspen removal was noted as positive in five of the seven sites examined by Newsome et al 2004Newsome et al , 2006aNewsome et al , 2006bNewsome et al , 2008.…”

Section: Introductionmentioning

confidence: 99%

“…The approach taken was similar to that of Harper et al (2009) where the objectives were to collect tree and stand level data to allow prediction of pine growth relative to neighbourhood aspen competition; and, to describe the impact of aspen composition on pine stand total and merchantable volume attributes.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Lodgepole pine and trembling aspen mixedwoods: Growth and yield within 22 to 39 year old pine plantations of northern interior British Columbia

HarperGeorge

2015

The Forestry Chronicle

Self Cite

View full text Add to dashboard Cite

Six lodgepole pine plantations located in the Sub Boreal Spruce (SBS) biogeoclimatic zone of northern interior British Columbia were chosen to study the impacts of aspen competition on the growth and yield of lodgepole pine. The six sites from four different zonal variants (dw2, dw3, dk1 and mc2) ranged in age from 22 to 39 years. Site preparation treatments occurred on all sites: drag scarification, disking, or a broadcast burn post clear-cut logging. Four of the sites received at least one operational brushing treatment for aspen (chemical or manual). At each site, 30 pine trees (CP) were selected as plot centres to represent the observed range of aspen competition. A series of nested plots up to 7.98 m radius was used to evaluate effects of % pine composition on stand density and stand volume using linear and non-linear models. At five of the six sites total volume was unchanged across the range of pine composition. The growth interaction between aspen and pine was found to be a linear relationship of competitive reduction where pine volume, basal area and merchantable volume was highly sensitive to any increase in aspen density or composition.Keywords: Lodgepole pine, aspen, boreal mixedwoods, growth and yield, merchantable volume, basal area, competition. RÉSUMÉSix plantations de pin lodgepole situées dans le sud de la zone biogéoclimatique de l' épinette subboréale (SBS) dans la région nord de l'intérieur de la Colombie-Britannique ont été choisies pour étudier les effets de la compétition par le tremble sur la croissance et le rendement du pin lodgepole. Les six plantations établies dans quatre variantes zonales (dw2, dw3, dk1 et mc2) étaient âgées de 22 à 39 ans. Des travaux de préparation du site ont été réalisés sur tous les sites : scarifiage par traînage et au moyen de disques ou encore par brûlage contrôlé après coupe à blanc. Quatre des six plantations ont fait l' objet d'au moins un traitement de débroussaillage (chimique ou manuel) afin de contrôler le tremble. Dans chaque plantation, 30 pins (CP) ont été choisis comme centres de parcelles-échantillons destinées à étudier l'importance de la compétition par le tremble. Une série de parcelles regroupées jusqu'à un rayon de 7,98 m a été utilisée pour évaluer les effets du pourcentage de la composition en pin sur la densité et le volume du peuplement en se servant de modèles linéaires et non linéaires. Pour cinq des six plantations, le volume total est demeuré inchangé, peu importe la composition en pin. L' effet de l'interaction entre le tremble et le pin sur la croissance se traduit par une relation linéaire où le volume du pin, sa surface terrière et son volume marchand diminuaient significativement avec tout accroissement de la densité ou de la composition en tremble.

show abstract

Section: Discussionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Lodgepole pine and trembling aspen mixedwoods: Growth and yield within 22 to 39 year old pine plantations of northern interior British Columbia

HarperGeorge

2015

The Forestry Chronicle

Self Cite

View full text Add to dashboard Cite

show abstract

“…Overtopping aspen has been shown to influence the growing conditions of understorey trees through impacts on suggest aspen threshold densities exist for unimpeded pine growth appear to contradict generally established principles of forest dynamics where tree growth is inversely related to density (Zeide 2002, Pretzsch 2009). Although total stand productivity may remain unchanged with increased levels of aspen, there is a significant decline in pine component growth and yield (Harper 2015) and several studies have documented diameter growth impacts in young pine (Newsome et al 2008, Harper et al 2009). Most published studies have focused on early establishment performance prior to canopy closure based on measurements of aspen competition in young pine from small plots.…”

Section: Introductionmentioning

confidence: 99%

Lodgepole pine and trembling aspen competition: Neighbourhood studies within 22 to 39 year-old pine plantations of northern British Columbia

George¹

2017

The Forestry Chronicle

View full text Add to dashboard Cite

Six lodgepole pine plantations located within the Sub Boreal Spruce (SBS) biogeoclimatic zone of the northern interior of British Columbia were chosen to study the impacts of neighbourhood aspen competition on the growth of planted lodgepole pine (22-39 years old). At each site, 30 pine trees (CP) were selected as plot centres across the observed range of aspen competition. Information on the six nearest neighbours (NN) and a variety of competition indices were evaluated using linear and nonlinear models. Competition indices based on diameter or height relative to size were found as the best overall predictors of CP growth. Proximity of NN to the CP was found to be inconsistent as a predictor of growth. Individual pine and aspen NN modelling suggested aspen competition had the greatest influence on CP growth restriction. The results do not support aspen thresholds for optimizing the growth of free growing pine plantations. It is recommended that performance-based standards be developed that account for aspen competition intensity and provide guidance for the management of pine stand productivity.Key words: Lodgepole pine, aspen, boreal mixedwoods, nearest neighbours, stem volume, competition. RÉSUMÉOn a identifié six plantations de pin tordu situées dans la zone biogéoclimatique de l' épinette sub-boréale (Sub Boreal Spruce-SBS) dans le nord de la Colombie-Britannique intérieure pour y étudier l'impact de la compétition du peuplier environnant sur la croissance de pin tordu dans des plantations de 22 à 39 ans. À chaque endroit, 30 pins (CP) ont été choisis comme centre de placette de manière à représenter tous les niveaux de compétition par le peuplier. Les renseignements pris sur les voisins les plus rapprochés (NN) ont servi à évaluer une variété d'indices de compétition à l'aide de régressions linéaires et non linéaires. On a observé que les indices de compétition basés sur le diamètre ou la hauteur par rapport à la taille donnaient les meilleures prédictions de croissance du CP. La proximité des NN par rapport au CP a donné des prédictions de croissance qui se sont avérées incohérentes. Le modèle individuel pin et peuplier le plus rapproché laisse voir que c' est la compétition exercée par le peuplier qui limite le plus la croissance du CP. Les résultats ne permettent pas d' établir de seuils de compétition du peuplier pour optimiser la croissance des plantations de pins. Nous recommandons d' établir des normes de performance qui tiennent compte de l'intensité de la compétition par le peuplier et qui puisse servir de guides pour gérer la productivité des plantations de pins.

show abstract

Timing of nest vegetation measurement may obscure adaptive significance of nest‐site characteristics: A simulation study

McConnell

Monroe

Burger

et al. 2017

Ecology and Evolution

View full text Add to dashboard Cite

Advances in understanding avian nesting ecology are hindered by a prevalent lack of agreement between nest‐site characteristics and fitness metrics such as nest success. We posit this is a result of inconsistent and improper timing of nest‐site vegetation measurements. Therefore, we evaluated how the timing of nest vegetation measurement influences the estimated effects of vegetation structure on nest survival. We simulated phenological changes in nest‐site vegetation growth over a typical nesting season and modeled how the timing of measuring that vegetation, relative to nest fate, creates bias in conclusions regarding its influence on nest survival. We modeled the bias associated with four methods of measuring nest‐site vegetation: Method 1—measuring at nest initiation, Method 2—measuring at nest termination regardless of fate, Method 3—measuring at nest termination for successful nests and at estimated completion for unsuccessful nests, and Method 4—measuring at nest termination regardless of fate while also accounting for initiation date. We quantified and compared bias for each method for varying simulated effects, ranked models for each method using AIC, and calculated the proportion of simulations in which each model (measurement method) was selected as the best model. Our results indicate that the risk of drawing an erroneous or spurious conclusion was present in all methods but greater with Method 2 which is the most common method reported in the literature. Methods 1 and 3 were similarly less biased. Method 4 provided no additional value as bias was similar to Method 2 for all scenarios. While Method 1 is seldom practical to collect in the field, Method 3 is logistically practical and minimizes inherent bias. Implementation of Method 3 will facilitate estimating the effect of nest‐site vegetation on survival, in the least biased way, and allow reliable conclusions to be drawn.

show abstract

Lodgepole pine growth as a function of competition and canopy light environment within aspen dominated mixedwoods of central interior British Columbia

Cited by 8 publications

References 59 publications

Lodgepole pine and trembling aspen mixedwoods: Growth and yield within 22 to 39 year old pine plantations of northern interior British Columbia

Lodgepole pine and trembling aspen mixedwoods: Growth and yield within 22 to 39 year old pine plantations of northern interior British Columbia

Lodgepole pine and trembling aspen competition: Neighbourhood studies within 22 to 39 year-old pine plantations of northern British Columbia

Timing of nest vegetation measurement may obscure adaptive significance of nest‐site characteristics: A simulation study

Contact Info

Product

Resources

About