A discussion of best management practices for reforestation following harvesting of lodgepole pine in the Alberta Foothills

Richard, DempsterW.; MeredithSharon,

doi:10.5558/tfc2014-148

Cited by 4 publications

(4 citation statements)

References 5 publications

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“…The beneficial effect may result from improved soil water relations and /or infected roots being brought to the soil surface. Drag scarification can also encourage plentiful natural regeneration at densities capable of offsetting high mortality should it occur (Johnstone 1976, Dempster andMeredith 2014).…”

Section: Selection Of Reforestation Practices To Reduce Mortality Andmentioning

confidence: 99%

“…Dempster and Meredith (2014) noted high levels of mortality in planted stock on some sites. Armillaria root disease was implicated in much of the mortality, and survival continued to diminish 11 years after planting.…”

Section: Introductionmentioning

confidence: 99%

“…These strategies involve harvesting to reduce the size and number of susceptible stands and to normalize the age-class structure of pine forests. However, reforestation continues to rely primarily on regeneration of harvested pine stands back to lodgepole pine and, until recently, mortality and health issues in young regenerated stands have not been major concerns (Dempster and Meredith 2014). Greater concern has been expressed in British Columbia where health problems in planted lodgepole pine deemed "free-to-grow" are extensive and are expected to increase with climate change .…”

Section: Introductionmentioning

confidence: 99%

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Impact of climate on juvenile mortality and Armillaria root disease in lodgepole pine

Dempster

2017

The Forestry Chronicle

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Variable and sometimes high levels of mortality in lodgepole pine (Pinus contorta Dougl. ex Loud. var. latifolia Engelm.) planted in western Alberta have raised awareness of the need to forecast and ameliorate risks to reforestation success. Mortality and health of regeneration during the 12 years following harvest were monitored and evaluated in relation to climate, site and silvicultural treatments. Results suggest that physiological stress related to evapotranspiration is the most prevalent cause of overall juvenile mortality and susceptibility to Armillaria root disease in planted pine. Mortality and disease not only increase at higher rates of drying during the growing season, but an opposite effect is also demonstrated whereby they decrease with increasing spring temperatures. Mechanical site preparation aimed at countering mortality and disease of planted stock with improved soil conditions appears to have good potential for ameliorating adverse climatic effects in juvenile stands.Keywords: climate, juvenile mortality, Armillaria root disease, lodgepole pine, reforestation RÉSUMÉ Les taux de mortalité variables et parfois élevés constatés dans les plantations de pin tordu (Pinus contorta Dougl. ex Loud. var. latifolia Engelm.) de l' ouest de l' Alberta font ressortir l'importance de prévoir et d'améliorer les chances de succès des reboisements. L' étude cherche à mettre en lien la mortalité et la santé de la régénération durant les 12 années suivant la coupe avec le climat, la qualité de station et les pratiques sylvicoles. Les résultats laissent voir que c' est le stress physiologique lié à l' évaporation qui est responsable de la mortalité juvénile et de la susceptibilité au pourridié-agaric (Armillaria) chez les pins en plantation. Non seulement la mortalité et la maladie augmentent-elles lorsque la sécheresse est plus importante au cours de la saison de croissante, mais on observe également un effet contraire et donc une diminution lorsque la température printanière augmente. La scarification mécanique visant à contrer la mortalité et la maladie chez les semis en améliorant la préparation du sol semble une option prometteuse pour améliorer les conditions climatiques adverses dans les jeunes peuplements.

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Section: Selection Of Reforestation Practices To Reduce Mortality Andmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impact of climate on juvenile mortality and Armillaria root disease in lodgepole pine

Dempster

2017

The Forestry Chronicle

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“…In the year 2000, a consortium of 10 forest management agreement holders in western Alberta identified the effects of planting, vegetation management, and pre-commercial thinning on the development of lodgepole pine stands following harvesting as being the highest priorities for cooperative growth and yield research. This led to the establishment of the Regenerated Lodgepole Pine (RLP) field trial to investigate and monitor these effects under experimentally controlled conditions [7].…”

Section: Introductionmentioning

confidence: 99%

Effects of Planting, Vegetation Management, and Pre-Commercial Thinning on the Growth and Yield of Lodgepole Pine Regenerated after Harvesting in Alberta, Canada

Dempster

2022

Forests

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A large long-term field trial was established in the Upper and Lower Foothills sub-regions of the Canadian boreal forest to monitor the effects of planting, vegetation management, and pre-commercial thinning on the development of lodgepole pine stands following harvesting. Data collected at the end of the trial’s regeneration phase, 17 to 20 years after its establishment, were tested for treatment effects and projected to rotation age. Planting generally improved stocking and increased projected growth and yield of lodgepole pine. On modal sites, planted trees were often greatly outnumbered by natural regeneration; however, on others, typically with either poorer or richer soils, satisfactory restocking was not achieved without planting. Control of competing vegetation by herbicide application facilitated regeneration of pine where it was otherwise difficult or impossible on sites with excessive herbaceous or hardwood competition. Pre-commercial thinning accelerated the growth of individual trees and was projected to shorten rotations in dense stands. Responses to the treatments varied depending on environmental factors. Particular treatments may be effective to meet management objectives under some site conditions but unnecessary or counterproductive elsewhere.

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Mid-Rotation Impacts of Stand Tending with Glyphosate on Plant Diversity in the Boreal Forest of West-Central Alberta

Mihajlovich¹,

Nash²,

Odsen³

et al. 2022

Forests

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Stand tending using glyphosate to promote coniferous overstory trees has been a common practice in the boreal forests of Alberta. However, there are concerns about the impact of this practice on biodiversity of understory species. This study examined the impact of broadcast glyphosate application during the active reforestation phase, two to several years post-harvest, on forest plant diversity 25 to 40 years post-harvest. Herbicide treatments had the desired effect of shifting tree layer dominance from deciduous to coniferous species, driven by a 25-fold reduction in the density of trembling aspen (3927 vs. 154 stems·ha−1, untreated and treated, respectively). However, understory plant diversity was not significantly different between treated and untreated sites as examined by the Shannon–Wiener (H) and evenness (E) indices. Shared plant species (beta) across sites was high. Of the seven site-indicator species examined, three had significantly lower cover on treated sites: Wild sarsaparilla, low bush-cranberry and oak fern. Total understory plant cover was significantly greater in the treated portion (98.0%) versus untreated (71.4%); however, this difference was not significant when bryophytes were excluded in the analysis. The establishment, maintenance and monitoring of larger long-term trials is strongly recommended.

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A discussion of best management practices for reforestation following harvesting of lodgepole pine in the Alberta Foothills

Cited by 4 publications

References 5 publications

Impact of climate on juvenile mortality and Armillaria root disease in lodgepole pine

Impact of climate on juvenile mortality and Armillaria root disease in lodgepole pine

Effects of Planting, Vegetation Management, and Pre-Commercial Thinning on the Growth and Yield of Lodgepole Pine Regenerated after Harvesting in Alberta, Canada

Mid-Rotation Impacts of Stand Tending with Glyphosate on Plant Diversity in the Boreal Forest of West-Central Alberta

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