194 resources found

This study investigates how commercial thinning impacts the growth, yield, and mortality of natural lodgepole pine forests in Alberta, Canada. Faced with a predicted timber shortage due to fires and mountain pine beetle infestations, the research explores thinning as a strategy to increase mid-term sawlog supply by accelerating tree growth and enabling earlier timber access. The findings reveal that while thinned stands initially show less volume, they ultimately demonstrate a greater cumulative volume gain when factoring in the wood removed during thinning. This benefit stems from increased individual tree diameter and live crown ratio for remaining trees and a significant reduction in overall tree mortality, particularly among smaller trees.

This extension note outlines the successional pathways of various forest ecosystems in British Columbia and how these natural trajectories are influenced by natural disturbances, forest management practices, and projected climate change. The document describes typical post-disturbance development, the impacts of human interventions like harvesting, and potential future shifts due to altered temperature and precipitation regimes. The primary aim is to provide natural resource managers with a concise overview to inform strategies for building resistant and resilient forests in the face of ongoing environmental change.

This paper explores operational resilience in western U. S. frequent-fire forests, emphasizing how historical forest structures fostered health and adaptability. The authors argue that very low tree densities prior to widespread fire suppression minimized competition, which in turn supported vigorous tree growth and greater resistance to stressors like drought and bark beetles. By comparing historical data with contemporary forest conditions using the Stand Density Index, the authors found a significant increase in tree density and competition today. This sugests that current management practices, which are focused primarily on fuel reduction, may not adequately restore the ecological resilience historically maintained by frequent, low-intensity fires. The paper advocates for a fundamental rethinking of forest management to prioritize significantly lower tree densities and minimal competition to enhance long-term forest health.

This document serves as a comprehensive guidebook for assessing the vulnerability of Sustainable Forest Management to climate change and implementing adaptation strategies. Recognizing that climate change is a critical challenge requiring a fundamental rethinking of forest management, the core purpose is to help forestry practitioners and policymakers determine if current SFM objectives can be met under future climates. The guidebook outlines a multi-chapter assessment process, including steps to define the SFM system of interest, evaluate current climate and forest conditions, develop future climate and forest impact scenarios, assess the system's adaptive capacity, and prioritize and mainstream adaptation options into existing policies and practices.

This document investigates the long-term effects of pre-commercial stand thinning in lodgepole pine forests in British Columbia, specifically examining 30-year responses across a range of thinning densities. The central focus is on whether heavy thinning can simultaneously enhance forest productivity, measured by merchantable wood volume and carbon storage, and accelerate the development of old-forest structural attributes important for wildlife conservation. Findings revealed that heavy thinning did create large dominant trees with substantial crowns and other old-growth features, partially supporting the goal of restoration of old-forest structural attributes, and restored much of the lost carbon storage through crown growth. This study suggests that the structural complexity created by heavy thinning, rather than forest age alone, may be sufficient to sustain comparable total abundance, species richness, and diversity of forest-floor small mammals to that found in old-growth stands, highlighting a viable silvicultural approach to address timber needs and ecological restoration.

This practical guide provides a comprehensive framework for commercial thinning in the North-Central Interior of British Columbia, specifically tailored for woodlot licensees operating in the Sub-Boreal Spruce zone. The document outlines a dual-purpose strategy designed to improve timber quality and stand value while simultaneously providing an immediate supply of wood fibre to regional mills. By focusing on immature, even-aged stands, the document explains how to select candidates based on height, density, and basal area, using tools like the spacing factor method to ensure trees have enough room to grow without destabilizing the forest. The document further details the mechanized harvesting process, emphasizing the use of specialized small-scale equipment and specific cutting rules to minimize damage to the remaining high-quality crop trees. This guide serves as an essential roadmap for foresters to balance economic feasibility with long-term silvicultural health through planning and real-time monitoring.

This document summarizes the early findings of a multidisciplinary study in Washington's Capitol Forest, which evaluates six different silvicultural regimes ranging from traditional clearcutting to group selection and untreated controls on an operational scale. By managing young-growth Douglas-fir stands for multiple objectives, researchers aim to provide forest managers with quantitative data on the biological, financial, and social consequences of various timber harvest patterns. Key themes include the comparative costs and feasibility of implementing these systems, the physical impact on soil and regeneration, and the public's aesthetic response to different landscape conditions. This study seeks to identify management options that can sustain high timber yields while simultaneously enhancing wildlife habitat and visual appeal to meet modern societal expectations.

This document evaluates the early success of the Northern Wetbelt Silvicultural Systems Project, a long-term study comparing how different logging methods affect forest health in east-central British Columbia. Researchers analyzed initial survival rates of planted spruce and cedar alongside the frequency of wind damage to residual trees across various harvest intensities, ranging from clearcuts to partial-retention systems. Their preliminary findings indicate that seedling survival is exceptionally high across all sites, while the risk of trees snapping or uprooting increases moderately as more of the surrounding forest canopy is removed. By providing baseline climate data and specific monitoring recommendations, the document serves as a foundational assessment to guide sustainable forest management and ecological restoration in the interior cedar-hemlock subzones.

This document investigates how to balance forestry interests with the survival of mountain caribou in British Columbia, specifically by moving away from clearcutting silvicultural systems. Because caribou rely on arboreal lichens found in old-growth forests for winter sustenance, traditional logging methods that remove all tree cover effectively destroy their primary food source and increase predation risks. The authors propose and test selection silvicultural systems, such as single-tree or group harvesting, which aim to extract timber while perpetually retaining stand characteristics necessary for caribou habitat. Through field trials, the study monitors how these partial-cutting techniques affect lichen biomass and growth rates, concluding that such methods should be integrated into a broader landscape-level strategy that includes designated no-harvest refugia.

This document is a part of a long-running Levels-of-Growing-Stock (LOGS) Cooperative Study in Douglas-fir stands, specifically detailing findings from installations at Sayward Forest and Shawnigan Lake in British Columbia. The core objective of the LOGS study is to understand how different thinning intensities impact cumulative wood production, individual tree size, and growth ratios in young Douglas-fir stands. This progress report summarizes data from these two Canadian sites, showing that volume growth is strongly tied to the amount of growing stock retained, and that thinning significantly influences tree size distribution and live crown development, suggesting potential for future productivity gains. The study also offers comparisons between various thinning regimes and unthhinned control plots, revealing the long-term implications of silvicultural practices on forest stands.

This study investigates the effects of forest thinning on the understory vegetation in ponderosa pine and Douglas-fir forests of south-central British Columbia. The study addresses the problem of forest in-growth due to fire suppression, which reduces grazing land and increases wildfire risk. Through a four-year data collection period at two sites, the researchers examined how thinning, which reduces tree density, impacts understory species diversity and biomass production. The findings indicate that while thinning may not consistently increase species diversity in the short term, it does lead to a significant increase in total understory biomass within a few years, suggesting its potential as a tool for ecological restoration and enhancing forage for livestock.

This document details a 15-year study examining the effects of partial cut logging, specifically single-tree selection harvesting, on dry-belt Douglas-fir stands in British Columbia. The research, initiated in 1993, investigated how different levels of residual growing stock and stand structure influenced the growth of remaining trees and the establishment of new seedlings. By remeasuring permanent plots and analyzing overstorey and understorey development, the study aimed to provide long-term data crucial for improving growth and yield models, informing sustainable forest management practices, and understanding the dynamics of these complex forest ecosystems.

This paper investigates how different forest harvesting methods impact both the amount of carbon stored and the variety of plant and tree life. The study compared the effects of clearcutting, varying levels of partial tree retention, and no harvesting across different climatic regions in British Columbia's Douglas-fir forests, ranging from humid to semi-arid. The central finding is that the intensity of harvesting significantly influences carbon storage and biodiversity, but importantly, the magnitude of these effects is strongly linked to the regional climate.

This report presents models to predict the likelihood of Douglas-fir mortality and bark beetle infestation following wildfires. The authors developed these tools using data from past fires in Montana and Wyoming, aiming to improve both pre-fire planning and post-fire management decisions. The report details the significant variables influencing tree survival and beetle attacks, such as crown scorch and cambium damage, and includes a supplementary field guide with visual aids and methods for field data collection, providing a practical resource for forest managers.

This study documents the Montane Alternative Silvicultural Systems project, a long-term cooperative study on Vancouver Island, British Columbia, established to find forest management practices that could replace conventional clearcutting in high-elevation coastal environments. This research initiative evaluated the operational, economic, and biological consequences of alternatives like patch cuts, green tree retention, and shelterwood logging. The findings cover crucial metrics such as operational costs and feasibility, as well as detailed ecological and silvicultural impacts on forest regeneration, soil health, and local biodiversity. The purpose of the MASS research was to provide the scientific foundation needed for implementing environmentally sustainable harvesting systems, such as variable retention, in the region's complex montane forests.

This document investigates the effectiveness of various thinning, pruning, and residue fuel management strategies designed to mitigate extreme wildfire hazards in the fire-prone forests of interior British Columbia. Using both simulated scenarios and analyses of actual operational treatments, the research modeled impacts on passive and active crown fire potential, as well as tree mortality. A key finding is that while removing small trees reduces the risk of passive crown fire, the concurrent removal of some larger trees is necessary to substantially reduce the threat of active crown fire. The study also confirmed that effective management of residue fuels is critical for treatment success, while pruning was found to have minimal impact on crown fire mitigation. This work provides valuable, region-specific data to help forest managers make informed wildfire management decisions regarding necessary treatment intensity.

This paper investigates the patterns of post-fire vegetation regeneration in two climatically distinct sites in Waterton Lakes National Park, Canada, following a severe montane fire and subsequent abnormally dry conditions. The study aimed to quantify the recovery trajectories of herbaceous understory and conifer seedlings over five years, revealing that site environmental conditions were more influential than inter-annual drought in determining recovery. Notably, the moist site exhibited greater herbaceous biomass accumulation while the drier site demonstrated significantly higher lodgepole pine seedling recruitment, indicating a complex ecological resilience to drought in fire-prone montane ecosystems. This paper affirmed the utility of remotely piloted aircraft systems for spatially monitoring changes in vegetation height, cover, and biomass after a disturbance.

This document outlines the critical need to braid Indigenous Knowledge and Western Science to create climate-adapted forests in the United States. A primary theme is the historical impact of Euro-American colonization, fire exclusion, and settler colonialism on North American forest ecosystems, leading to the loss of Indigenous stewardship and creating dense, fire-maladapted landscapes highly vulnerable to severe wildfires and climate change stressors. The text defines IK as an invaluable, multi-generational body of systemic knowledge and cultural practices emphasizing kinship with nature and reciprocity, contrasting it with the empirical and objective approach of WS.

This paper examines the complex relationship between forest health and climate change from a British Columbia perspective, building on the impact of past events like the mountain pine beetle and Dothistroma needle blight epidemics. The authors present estimations of how various forest pests are expected to behave as climate continues to change, emphasizing that rapid environmental shifts are favoring fast-reproducing pests over long-lived trees. The research offers management recommendations aimed at increasing forest resilience, such as implementing assisted migration and genetic diversity, while stressing that the future of forest management requires flexibility and adaptation in the face of unprecedented uncertainty. The purpose of this paper is to equip managers with projections for the near future and emphasize the urgency of integrating proactive forest health measures into all aspects of land-use planning.

This document introduces the concept of fire-smart forest management as a pragmatic approach to achieving sustainable forest management in Canada's fire-dominated ecosystems. The core challenge addressed is how to simultaneously minimize the socioeconomic impacts of fire while maximizing its ecological benefits, objectives that have historically been seen as contradictory. Fire-smart forest management integrates both forest and fire management activities, from stand to landscape levels, through proactive planning, such as altering forest fuels to reduce the potential for undesirable wildfires and lessen the risks associated with prescribed burning. This new paradigm is necessary because traditional aggressive fire suppression is reaching its maximum effectiveness, necessitating a shift in attitude to embrace fire's essential ecological role and mitigate its negative effects through integrated management strategies.