63 resources found

This paper explores the complexities and challenges associated with using gap-based silviculture in the mesic northern forests of North America. The authors begin by outlining the theoretical basis of gap management, which assumes that creating canopy openings enhances tree species diversity. However, the paper emphasizes that relying solely on varying gap size often falls short of achieving diversity goals due to a multitude of interacting factors beyond light availability. These crucial factors include site history, seed dispersal, competition from other vegetation, and the impact of herbivores. The authors propose a revised, more integrated concept of gap-based silviculture that incorporates a broader range of ecological considerations and active management of understory conditions to promote structural complexity and enhance tree species diversity in these valuable forest ecosystems.

This paper details a study examining how different forestry practices, specifically partial cutting methods like group selection and irregular group shelterwood, impact the survival and growth of planted lodgepole pine and interior spruce seedlings. The research compared these outcomes to those in clearcut areas, with the overarching goal of identifying silvicultural systems that can maintain suitable habitat for northern caribou, which rely on terrestrial and arboreal lichens found in these forests. By analyzing seedling survival and growth over five years in relation to different harvesting techniques, the study aimed to determine if partial cutting could effectively regenerate desired tree species while minimizing negative effects on critical caribou forage. The findings provide insights into balancing timber harvesting with the ecological needs of threatened caribou populations in this region.

This paper explores silviculture strategies applicable in British Columbia's designated northern caribou ranges. It addresses the critical intersection of forestry practices and caribou conservation, especially in light of the mountain pine beetle infestation and resulting salvage logging. The paper synthesizes current scientific research to provide guidelines for managing forest stands to maintain or improve caribou habitat, considering their ecology, legal protections, and the potential impacts of forestry operations. The paper aims to offer practical silvicultural options that balance timber harvesting with the conservation of this sensitive species and its habitat.

This paper presents an overview of how forest management practices can influence groundwater systems in British Columbia. The paper establishes the importance of groundwater within watersheds and for human use, highlighting the limited understanding of its interaction with forestry. To address this gap, the paper classifies British Columbia into distinct hydrogeologic landscapes, based on climate, geology, and physiography, to provide a regional framework for analysis. The core of the discussion then reviews existing literature on the effects of forest harvesting and road building on groundwater hydrology, such as changes in water table levels and recharge rates, within the context of these landscapes, ultimately aiming to raise awareness and inform sustainable forest management practices to protect this vital resource.

This paper addresses the increasing need for forestry practices to adapt to predicted climate changes. The authors explore assisted migration, defined as the purposeful movement of species to mimic natural range expansion, as a key strategy within forest management to ensure the resilience and productivity of future forests. Recognizing that many tree species cannot naturally migrate quickly enough to keep pace with climate shifts, the paper argues that proactive interventions like assisted migration are essential. The authors discuss different forms of assisted migration, weigh the associated risks and benefits, particularly within the context of British Columbia's forestry, and outline crucial policy and research needs to effectively implement this adaptation approach.

This paper investigates how well lodgepole pine forests naturally regrow after partial harvesting in important winter habitats for northern caribou in west-central British Columbia. The study compares the density and growth of new pine seedlings in small harvested openings across two different subzones and under three different partial harvesting methods over a seven-year period. A key focus is understanding if these methods can successfully regenerate the forest without harming the lichens that the caribou rely on for food, ultimately aiming to inform forest management practices that balance timber harvesting and wildlife conservation.

This document introduces a method for prioritizing commercial thinning in forests by integrating high-density drone laser scanning (DLS) data with tree-ring measurements. This research uses DLS to quantify individual tree growth and competition, specifically identifying that crown volume is the strongest predictor of recent basal area growth. This innovative approach allows for the creation of detailed spatial maps, including a new "growth competition index," which can guide forest managers in optimizing thinning strategies across large areas, moving beyond traditional stand-level assessments to a more precise, intra-stand management. The study emphasizes how this technology provides timely, fine-scale information to enhance the efficiency and effectiveness of silvicultural practices, particularly commercial thinning.

This paper investigates the factors influencing wildfire burn severity across Canada. Using statistical models applied to environmental data from 1981 to 2020, the authors identify fuel aridity as the most significant driver of how severely forests burn. Their analysis reveals that northern regions and summer months are particularly prone to high-severity fires, and they found a concerning trend of increasingly favorable conditions for severe burning in recent decades, particularly in spring and autumn. The study concludes that changing climates are making Canadian forests more susceptible to intense fires, highlighting the need for improved fire management and preparedness strategies.

This paper investigates the differential ecological impacts of an extreme 2017 wildfire versus ongoing prescribed burns in Waterton Lakes National Park, AB. The core objective is to understand how reintroducing historical land-use processes, particularly through Traditional Ecological Knowledge, can enhance ecosystem resilience against modern stressors like climate change and invasive species. The study focuses on the Kenow wildfire's high-severity effects on a native-grass prairie compared to lower-severity prescribed burns, suggesting that while prescribed burning is beneficial, incorporating the full historical eco-cultural context, including the role of free-ranging bison and late-season Indigenous burning practices, is crucial for effective ecological restoration. The authors conclude that extreme disturbance is not necessarily catastrophic and that combining TEK with adaptive co-management can create landscapes more resilient to pervasive change.

This document investigates how partial harvesting strategies, designed to enhance mule deer habitat and allow timber extraction in British Columbia's dry Douglas-fir forests, impact complex interactions with natural disturbances like insect outbreaks and wildfires. The study, spanning 30 years, found that while short-term harvesting altered forest structure and reduced the immediate risk of crown fires and Douglas-fir beetle infestations, many of these structural and susceptibility changes reverted over the long term. The removal of harvesting residuals proved more significant in mitigating long-term disturbance risks, particularly for Douglas-fir beetles and intense surface fires, than the time elapsed since the treatment itself. The authors conclude that sustainable forest management integrating timber extraction and mule deer habitat conservation is achievable if partial harvesting occurs at intervals of 30 years or less and residuals are promptly cleared.

This paper introduces walking on two legs, an Indigenous framework for ecosystem restoration and reconciliation in fire-adapted landscapes, particularly in Western Canada. The concept advocates for balancing Indigenous knowledges with Western scientific knowledge, ensuring that Indigenous perspectives and stewardship ethics guide the interconnected processes of restoration and reconciliation. The authors argue that genuine reconciliation requires Indigenous-led restoration of lands, knowledges, and cultures, moving beyond simply integrating Indigenous knowledge into existing Western frameworks. This approach aims to rebuild respectful relationships between people and the land, addressing the legacies of colonialism and revitalizing Indigenous practices like fire stewardship.

This paper highlights the crucial role of boundary spanners in addressing the escalating challenge of wildfires in Western Canada. These individuals and organizations bridge critical gaps, spanning different knowledge systems, organizations, and geographical areas, to foster collaboration and implement proactive fire management strategies, such as cultural and prescribed burning. The authors emphasize that despite the vital work of boundary spanners in building trust, sharing knowledge, and developing capacity, their contributions are often undervalued and lack sufficient institutional support. The piece concludes by asserting the urgent need for dedicated investment in boundary spanning roles to effectively integrate diverse expertise and facilitate collaborative, equitable solutions for wildfire management.

This paper reviews the effectiveness of stand-level fuel reduction treatments in Canadian boreal conifer forests, specifically focusing on black spruce, jack pine, and lodgepole pine. These treatments, which involve thinning trees, pruning lower branches, and removing understory vegetation, aim to mitigate the risk of fast-spreading, high-intensity crown fires that are naturally prevalent in these ecosystems. While these fuel treatments generally reduce modeled and observed fire behavior under low to moderate fire weather, evidence suggests they become ineffective under very high or extreme fire conditions, especially when combined with high surface fuel loads and the relatively short stature of boreal conifers. The authors highlight the need for further research into managing surface fuel loads, exploring alternative fuel configurations, and integrating these treatments with broader fire suppression strategies.

This paper presents the long-term ecological effects of forest fuel and restoration treatments from the ongoing national Fire and Fire Surrogate study, analyzing data collected over approximately 20 years across four diverse sites in the Western and Eastern United States. The central goal of the original FFS study was to evaluate how mechanical treatments and prescribed fire impact forest ecosystems by reducing fire hazard, promoting desirable fire-adapted species, and improving understory diversity. Key findings reveal that the most effective treatment varies significantly by region: mechanical treatments combined with fire yielded better long-term outcomes in Western pine-dominated forests, while prescribed burning alone proved more beneficial in Eastern hardwood-dominated forests. The authors conclude that to maintain these desirable conditions and achieve long-term resilience, treatments must be adapted to the specific ecosystem and followed up with repeated applications.

This paper synthesizes the disparate groundwater responses to wildfire, noting that post-fire effects range from significant increases to decreases in water fluxes like recharge and baseflow. The authors evaluate this variability across five primary categories: climate, vegetation, hydrogeology, fire characteristics, and the cryosphere, focusing on both short-term and intermediate recovery periods. A critical finding is that post-wildfire responses often align with hydroclimatic settings where water input and evaporative demand are out of sync, while the pre-wildfire groundwater regime significantly influences the expected outcome and recovery trajectory. This paper provides a collection of testable hypotheses and identifies key areas, particularly the influence of snow dynamics and cryospheric processes, for future monitoring and modeling efforts to improve the prediction of groundwater recovery after fires.

This paper investigates how wildfires influence the upward migration of tree species in California's subalpine forests, a phenomenon often linked to climate change. Researchers examined post-fire tree regeneration across various fire severities, focusing on the contrasting responses of shade-tolerant and shade-intolerant conifer species. While overall montane species regeneration decreased in burned areas, shade-intolerant Jeffrey pine showed increased success in severely burned plots, aligning with predictions of higher climatic suitability. Conversely, shade-tolerant red fir regeneration declined significantly with higher fire severity, suggesting that the specific regeneration niche of a species, its ideal post-fire conditions, is critical in determining whether fire facilitates or hinders its range expansion.

This paper investigates the effectiveness of different forest fuel treatments, such as thinning and prescribed burning, in reducing the severity of subsequent wildfires. Leveraging a unique 1200-hectare experiment that was later impacted by a significant wildfire, the authors compared various treatment approaches, including thin-only, burn-only, and a combination of both, against an untreated control. Their analysis of fire severity metrics, considering pre-fire fuel conditions and fire weather, provides strong evidence that proactive fuel management, especially combining thinning and burning, significantly mitigates wildfire intensity and damage to trees, even decades after the treatments were implemented and under a range of weather conditions. The study supports the continued use of these treatments as valuable tools for forest restoration and enhancing resilience to increasingly severe wildfires.

This paper explores the opportunities and limitations of forest thinning as a strategy to enhance the resistance and resilience of trees and forests to global change. The authors reviewed existing literature to assess how thinning impacts forest vulnerability to key stressors like drought, fire, insects and pathogens, and wind. While the study identifies several instances where thinning can be beneficial, particularly in mitigating drought and fire risks, it emphasizes that thinning is not a universal solution and its effectiveness varies depending on the specific stressor, forest type, and management practices. The paper highlights the need for more research, especially in underrepresented regions, to better understand the long-term effects of thinning and to develop effective adaptive forest management strategies in the face of increasing global environmental challenges.

This paper investigates how diversifying managed forests in British Columbia could enhance their ability to recover from disturbances, specifically a recent mountain pine beetle epidemic linked to climate change. The authors used computer simulations to compare different forest management strategies over an 80-year period, assessing their impact on ecological resilience, timber supply, and economic outcomes. Their findings suggest that a strategy focused on proactively harvesting dominant, susceptible tree species and promoting a greater variety of planted and naturally regenerating trees leads to improved forest health, higher long-term harvest rates, and more stable economic returns without compromising economic viability. The study advocates for incorporating diversification as a key approach to increasing the resilience of managed forests in the face of future environmental challenges.

This paper investigates whether the growing popularity of mass timber as a construction material could lead to unsustainable logging practices in the United States. The authors utilize U. S. Forest Service data to project future timber demand based on optimistic estimates of mass timber consumption in 2035 and compare this with current and projected forest growth. Their analysis considers various factors, including regional differences and timber growth in both harvestable and protected areas, aiming to determine if the U. S. timber supply can sustainably meet the anticipated increase in demand driven by mass timber adoption.