46 resources found

This webinar examines the complex relationship between insect outbreaks and subsequent wildfire dynamics in the Pacific Northwest. By analyzing decades of data on the mountain pine beetle and the western spruce budworm, this webinar challenges the common campfire hypothesis that dead trees inevitably lead to more frequent or more intense fires. The findings reveal that insect activity does not consistently increase fire likelihood and often results in lower burn severity because the insects act as a natural thinning agent that reduces available fuel over time. Overall, this study suggests that while these native disturbances significantly alter the landscape, they do not constitute a regional fire hazard or an immediate forest health crisis requiring aggressive management intervention.

This webinar explores the landscape-level effectiveness of fuel treatments in the Southern Blue Mountains of Oregon. Using the Landis-II simulation model, the study evaluates how different management strategies such as mechanical thinning and prescribed burning impact wildfire spread and severity under both contemporary and extreme weather scenarios. A primary finding is that while treatments work at a local scale, tripling the current levels of prescribed fire is necessary to significantly shift wildfire behavior across the broader landscape. The research suggests that spatially optimizing treatments in high-risk zones can be just as effective as distributing them widely, offering a more efficient way to manage resources while preparing for a future of increased wildfire activity driven by climate change.

This webinar explores landscape fuel treatment effectiveness, shifting the focus from individual forest stands to broad-scale fire behavior. By integrating empirical studies, simulation modeling, and manager-led case studies, the webinar provides a multifaceted view of how strategic vegetation removal can alter a wildfire's trajectory even beyond the treated boundaries. A central theme is the distinction between site-level and landscape-level effects, emphasizing that treatments are most successful when they function as a spatial mosaic designed to facilitate suppression efforts and reduce high-severity fire. The webinar proposes a new iterative monitoring framework that encourages land managers to move past simple metrics like acres burned toward a more nuanced understanding of landscape resilience and treatment longevity in an era of climate change.

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 long-term effects of post-wildfire logging in dry coniferous forests east of the Cascade Range. It addresses a key debate by presenting findings that post-fire logging effectively reduces future surface woody fuel levels over several decades, thereby potentially mitigating the severity of subsequent wildfires. Furthermore, the research indicates that when best management practices are employed, post-fire logging has minimal lasting negative impacts on the recovery of understory vegetation. The purpose of this publication is to provide scientific information to land managers making decisions about post-fire forest management, particularly regarding fuel reduction and ecological impacts.

This document provides a comprehensive guide for managing logging slash produced by thinning operations in ponderosa pine forests, with the critical goal of minimizing colonization and subsequent infestation of residual trees by bark beetles. Thinning creates substantial amounts of woody debris which serves as an ideal habitat for beetles, and as such, managers must employ various techniques to mitigate risk. The document explores factors influencing beetle attacks, such as timing of slash creation, stand density, and log size, while detailing practical management strategies including direct removal, solarization, and the complicated trade-offs of using techniques like chipping and green chaining. The purpose of this document is to equip land managers with diverse, site-specific treatment options to balance forest health objectives with the urgent need to reduce bark beetle risks.

This document outlines a framework for restoring ponderosa pine and dry mixed-conifer forests on Colorado's Front Range, addressing the increased size and severity of recent wildfires. It emphasizes understanding the historical ecological dynamics of these forests, particularly changes in density and fire regimes, to inform modern management. The document details principles and guidelines for restoration and emphasizes the importance of spatial and temporal scale, enhancing desired and rare structural elements like openings and tree groups, and working with natural environmental gradients and disturbance patterns. This document provides a process for planning, implementing, and monitoring restoration projects, highlighting the crucial role of adaptive management and interdisciplinary collaboration to ensure forest resilience and sustained delivery of ecosystem services.

This paper investigates the impact of long-term fire suppression on the drought sensitivity of mixed-conifer forests in the Western United States. The study utilizes tree-ring analysis of stable carbon isotopes to demonstrate that the exclusion of frequent, low-severity wildfires has led to overcrowded forest stands. This increased density results in heightened competition for water and nutrients among trees, making them more susceptible to drought stress, insect outbreaks, and disease compared to historically open forests maintained by fire. The findings emphasize the importance of reintroducing fire and managing stand density for forest restoration and increasing resilience to future climate conditions.

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 study focuses on aspen, a vital broadleaf tree, examining its distribution and health in north-central BC and the various threats it faces, including climate change, forest management practices, and ungulate grazing. It explores the ecological implications of potential aspen declines, specifically considering the relationship between aspen and beaver-created shallow water wetlands, offering recommendations for future research and management.

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 document serves as a comprehensive guide for land managers considering mastication as a vegetation management tool. It synthesizes current scientific knowledge, detailing the characteristics and costs of various mastication equipment, including carrier machines and cutting heads. The report also summarizes the ecological effects of mastication on vegetation, soils, and wildlife habitat, noting the variability of these impacts across different ecosystems. It provides decision trees and implementation criteria to aid managers in selecting the most appropriate treatment methods and mastication configurations based on their specific site conditions and management objectives.

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 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 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 synthesizes existing knowledge on reintroducing fire into long-unburned, fire-dependent forests of the United States, specifically focusing on how to minimize mortality of large, old trees. Historically, these ecosystems experienced frequent, low-intensity fires, which kept fuel loads low and fostered fire-tolerant species. However, over a century of fire suppression has led to unprecedented accumulations of deep duff and increased tree densities, making reintroducing fire a complex challenge that can paradoxically harm the very old trees practitioners aim to protect. The document delves into causes of tree injury and mortality from fire, such as basal cambium damage from smoldering duff and subsequent bark beetle attacks, and explores various management options including prescribed burning with the aim of restoring historical forest conditions and preserving venerable trees.

This document provides guidance on using fuel treatments and prescribed burning to protect whitebark pine forests, emphasizing methods to mitigate WBP mortality during fire. It outlines specific thresholds for crown and bark char damage that threaten tree survival and suggests that mechanical treatments may be necessary to reduce fuels prior to burning, particularly in areas with abundant competing conifers. The document categorizes forest stands as Good, Marginal, or Avoid Candidate Areas for prescribed burning based on the presence of cone-bearing WBP trees and vigorous regeneration, advocating for mechanical fuel reduction in high-value areas and generally advising against burning stands with high levels of cone-bearing trees or limited competition. Finally, the paper recommends coordinating fire planning with silviculturists and entomologists to account for factors like mountain pine beetle pressure and ensure a heterogeneous forest structure that minimizes the risk of large, high-severity wildfires.

This webinar presents results from a simulation study of north-central New Mexico that investigated the relative effectiveness of a variety of fuel treatment strategies and the tradeoffs of implementing fuels programs with competing management goals.

This paper addresses the severe decline of High Elevation Five-Needle White Pine forests in western North America, primarily due to mountain pine beetle outbreaks, white pine blister rust, and altered fire regimes exacerbated by changing climates. The authors advocate for multi-scaled management interventions to promote resilience to disturbances and genetic resistance to white pine blister rust. The paper details the critical need for long-term programs like inventory, mapping, and research, alongside active restoration treatments such as mechanical cuttings and prescribed fires, and proactive tree-level measures like planting rust-resistant seedlings and protecting high-value trees, all while integrating climate change considerations throughout the planning and implementation process.

This report compiles over 80 years of fire research to explain how human interventions have altered natural fire regimes, particularly in dry Western U. S. forests. The document emphasizes that accumulated fuels and dense forest structures, a departure from historical conditions, lead to more intense and severe wildfires, posing risks to both ecosystems and human communities. It details various fuel treatments, such as thinning and prescribed fire, as crucial strategies for restoring fire-resilient forests by reducing surface, ladder, and crown fuels. The report advocates for a landscape-level approach to fuel management, acknowledging that while models and observations inform these efforts, uncertainties remain in predicting exact fire behavior.