144 resources found

This study aims to quantify the loss of coarse woody debris habitat due to reservoir construction and identify affected terrestrial vertebrate species. The authors explore management strategies to restore or enhance CWD, defining CWD as woody material greater than 10 cm in diameter lying on the ground, including stumps. The paper provides a framework for understanding and mitigating the ecological consequences of hydroelectric development on forest ecosystems.

This document outlines the Carpenter LakeBridge River Prescribed Fire Planning initiative from September 2000, developed for the B. C. Hydro Bridge Coastal Fish and Wildlife Restoration Program. The core purpose of the project is to enhance and expand crucial winter range habitat for ungulates, specifically Mule Deer, California Bighorn Sheep, and Mountain Goats, within the Carpenter Lake drainage area through the strategic application of prescribed fire. It addresses how fire suppression has led to coniferous encroachment, diminishing the open grassland ecosystems essential for these animals, and details the objectives, techniques, and specific areas identified for burning to restore more suitable forage and diverse habitat. The document also highlights past fire history in the area, the specific benefits of prescribed fire for each ungulate species, and detailed planning considerations for future burns.

This document investigates the economic viability of commercial thinning in second-growth forests on British Columbia's coast. Using the TIPSY 4.2 modeling software, the author simulates various scenarios by inputting existing forest data and economic variables to predict stand yields and financial outcomes. While acknowledging the environmental and silvicultural benefits of commercial thinning (like improving stand quality, accelerating wood volume, and enhancing biodiversity) the study's initial findings suggest that, under current conditions, commercial thinning is not economically feasible. However, it also explores the potential for future use, considering factors such as different thinning intensities, harvesting methods, and the impact of government assistance programs.

This study addresses the ecology and management of interior Douglas-fir at the northern extent of its range in British Columbia, particularly within the Prince George Timber Supply Area. The study delves into concerns about a perceived decline in Douglas-fir abundance, exploring its ecological, cultural, and economic significance in this northern environment. It synthesizes existing knowledge on Douglas-fir, examining past and present management practices, its role in local ecosystems including wildlife habitat and soil health, and challenges related to its regeneration, often comparing it with other species like lodgepole pine and spruce. The document serves as a problem analysis and aims to inform the development of an interim management strategy and future research directions for sustaining Douglas-fir in these unique northern landscapes.

This document details the Revelstoke Community Forest Corporation's implementation of a single-tree selection silvicultural system in a second-growth forest area. The primary objectives of this alternative harvesting method were to maintain ungulate winter range, cultivate caribou habitat, minimize visual impacts from a nearby highway, and enhance future wood quality, particularly by reducing western white pine mortality. The document outlines the site's characteristics, the planning and prescription process for harvesting, and the challenges and successes of the logging operation, including cost analyses. This document concludes that while initial costs were higher, this approach offers a feasible way to access timber in sensitive areas that would otherwise be off-limits to traditional clearcutting, with an expectation of reduced costs as experience grows.

This extension note presents a case study on using partial cutting to reduce the susceptibility of mature Lodgepole Pine stands to Mountain Pine Beetle attacks, a process termed Beetle Proofing. The document details the objectives and criteria for this forestry practice, emphasizing proper layout, experienced logging contractors, and a commitment to overall parties. It outlines the harvesting and silviculture systems involved, explaining how selective removal of trees aims to create a stand structure that is less vulnerable to beetle infestations, rather than a clear-cut approach. This document serves as a guide for forest management, outlining management objectives and planning for sustainable timber production and biodiversity while mitigating the impact of MPB in the British Columbia interior.

This paper addresses the critical need for improved understanding of the long-term effectiveness of fuel reduction treatments in dry, fire-prone forests of western North America. The authors highlight that current knowledge limitations lead to inefficient maintenance and inaccurate wildfire forecasting. They propose six key research opportunities designed to refine our grasp of how long treatments remain effective. These opportunities include evaluating longevity within specific management goals, referencing desired ecological conditions, accounting for natural forest variability, exploring internal treatment factors, increasing post-treatment sampling frequency, and incorporating spatial heterogeneity into analyses. The paper aims to foster climate-adaptive management that enhances dry forest resilience to wildfire through more efficient and informed treatment strategies.

This paper investigates the effectiveness of various fire management treatments on western U. S. coniferous forests, which have become more susceptible to severe wildfires due to a century of fire exclusion and altered land use. Researchers analyzed the impacts of mechanical thinning, prescribed burning, and a combination of both across six diverse sites. The study found that mechanical thinning combined with prescribed fire was the most effective strategy for significantly reducing surface fuel loads, decreasing the likelihood of severe crown fires, and lowering predicted tree mortality. While mechanical-only treatments were less consistent, they were effective when whole-tree harvesting systems were used, minimizing residual surface fuels.

This paper explores how wildfires and beetle communities interact to influence Douglas-fir beetle outbreaks in British Columbia's forests. Traditionally, DFB populations are expected to surge after fires due to an abundance of weakened trees, but this study reveals a more complex dynamic. The presence of woodboring beetles, which also colonize fire-injured trees, can significantly constrain DFB population growth through interspecific competition. Specifically, when woodborers infest over 50% of trees in a stand, DFB reproduction falls below replacement levels, suggesting that these competitors can suppress potential DFB irruptions and ultimately influence forest resilience after disturbances.

This document details a research project in British Columbia testing various silvicultural systems beyond traditional clearcutting to manage forests for multiple values, not just timber. The study evaluated the costs, productivity, tree damage, and soil disturbance associated with different harvesting methods used in the first phase of the project. The findings highlight the trade-offs between different approaches, noting that methods like clearcutting were most cost-effective for harvesting, while alternative systems resulted in varying levels of tree damage and soil disturbance.

This document details a research project in the Cariboo Region of British Columbia focused on revising free-growing guidelines to better account for the interactions between young conifer plantations and broadleaf trees, particularly trembling aspen. The central theme is understanding the competitive relationships between aspen and various conifer species across different biogeoclimatic zones. Through long-term experimental studies and field verification, the researchers gathered data on tree growth, health, and density to propose scientifically supported adjustments to the regulations that determine when a reforested area is considered successfully established. The goal of this study was to create more ecologically informed and practically applicable guidelines that recognize the potential benefits of broadleaf presence while ensuring successful conifer regeneration for timber production.

This paper investigates how different forest management strategies impact the resilience of forests facing climate change, specifically a mountain pine beetle outbreak in British Columbia. The authors use a retrospective simulation approach from 1980 to 2060 to compare business as usual practices with two alternative strategies: one focused on increasing the diversity of replanted trees, and another that combined early harvesting of susceptible pine with diversified reforestation. The study assesses resilience by examining ecological factors like growing stock and tree species diversity, alongside socio-economic indicators such as timber flow stability and net revenue, concluding that proactive management enhancing diversity and reducing high-risk species leads to greater overall forest resilience in the face of climate-related disturbances.

This report details a second timber harvest entry conducted on a mule deer winter range in British Columbia, thirty years after the initial logging. The study examines the application of General Wildlife Measures for shallow and moderate snowpack zones, focusing on a clumpy single-tree selection silvicultural system designed to balance timber harvesting with maintaining and enhancing mule deer habitat. Key aspects explored include the planning and operational implementation of this approach, including the creation of small canopy gaps and thinning from below, along with the lessons learned regarding ecological impacts, adherence to regulations, and operational feasibility. The report serves to document this long-term research project's progression and inform future management practices on similar winter ranges.

This report addresses the critical issue of maintaining large, old trees in United States forests that historically experienced frequent fires but have been subjected to long periods of fire suppression. The document synthesizes existing research to understand how reintroducing fire through prescribed burning impacts these venerable trees, particularly concerning injury and mortality. It delves into the causes of tree death from fire, including heat damage to crowns, cambium, and roots, with a specific focus on the role of accumulated duff and subsequent bark beetle attacks. Furthermore, the report examines management options and treatment effects aimed at enhancing old tree resilience during prescribed burns, offering practical guidance on techniques like duff raking and burning under specific conditions, ultimately striving to balance ecological restoration with the conservation of these keystone forest components.

This paper investigates the interplay between future wildfire risk and the greenhouse gas mitigation potential of rehabilitating forests in British Columbia, Canada. Using modeling that simulates future fire scenarios and tracks carbon in forests and harvested wood products, the study assesses whether post-fire salvage logging and replanting can lead to a net reduction in GHG emissions compared to natural regeneration. The authors explore the conditions under which these rehabilitation efforts yield climate benefits and compare this potential mitigation against the substantial GHG emissions from the projected increase in wildfires, questioning if resources might be better directed towards preventing fires in the first place.

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 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 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 document serves as a first approximation of guidelines for managing forests in British Columbia. Recognizing the historical influence of First Nations' cultural burning and the current challenges of overstocked stands and wildfire risk, it outlines a strategic shift in silvicultural practices. The report details Best Management Practices (BMPs), structured around key aspects like appropriate silvicultural systems, restoration thinning, regeneration, and resilience to disturbances like fire and pests. The document aims to guide practitioners and inform policy, moving towards healthier, more resilient Douglas-fir ecosystems that balance ecological values, community safety, and sustainable resource use.

This FRDA Report #097 investigates the net basal area response of Douglas-fir trees to nitrogen fertilization in stands that have been thinned and unthinned. The research, based on a 9-year study in British Columbia, developed equations to predict how fertilization affects tree growth and focused on how thinning influences the effectiveness and longevity of fertilizer application. Key findings indicate that thinned stands show a greater and more persistent response to nitrogen fertilization compared to unthinned stands where the effect tends to dissipate more quickly. The study provides valuable insights for forest managers on optimizing silvicultural practices by combining thinning and fertilization to enhance Douglas-fir productivity.