63 resources found

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 research compiles and analyzes a national database of dead and down woody debris to improve fire behavior and effects modeling in Canadian forests. The study emphasizes that DWD is a major component of surface fuels, significantly impacting fire intensity, consumption, and the transition to crown fires. By examining various forest types and ecozones, the authors identified key predictive variables such as bioclimatic regime, age, and structural components. This work provides crucial tools for a more accurate understanding of DWD distribution across Canada, enhancing the country's ability to forecast and manage wildfires.

This report introduces a quantitative old-growth index specifically designed for Douglas-fir forests in central British Columbia's Interior Douglas-fir zone, particularly in the IDF_dk_3 and IDF_dk_4 biogeoclimatic variants. Recognizing that traditional age-based definitions of old growth are insufficient for forests frequently impacted by disturbances, the authors developed an index based on measurable structural attributes like tree size, canopy complexity, and the presence of dead trees. This index aims to provide forest managers with a consistent tool to identify and classify old-growth stands into four seral stages, helping guide management practices for biodiversity conservation and the enhancement of old-growth characteristics. The study emphasizes that this index relies on expert professional judgment to quantify what constitutes old-growth attributes in these specific forest types.

This document introduces an innovative old-growth index developed to accurately measure and track the ecological value of forests, especially those prone to disturbances. Moving beyond traditional age-based definitions, the researchers used Aerial Laser Scanning (ALS) and field data to create a more comprehensive metric that considers diverse structural attributes like tree size, deadwood, and canopy complexity. The study's application in British Columbia's Chinook Community Forest revealed that "very-high" old-growth value forests are scarce and fragmented, often located outside designated protected areas. This research provides a flexible and robust framework for forest managers to better conserve and monitor these vital ecosystems and their services, aiding in more effective landscape-level planning.

This extension note focuses on the hydrological equivalent clearcut area as a tool for managing forests in British Columbia that have been affected by natural disturbances like mountain pine beetle infestations. It explores how different stand-level treatments, such as salvaging timber and replanting, can influence ECA over time compared to leaving stands unsalvaged. The author examines the contributions of various stand components-including surviving trees, dead snags, and regeneration-to ECA and compares the cumulative hydrological effects of different management strategies using ECA years. The document provides a decision framework to help forest managers consider hydrological values, especially when detailed assessments aren't possible, while also acknowledging other important ecological and economic factors in rehabilitation decisions.

The Forest Carbon Management micro-certificate is designed for professionals in natural resource sectors. It provides foundational knowledge in forest carbon accounting, data analysis, project development, and market navigation. Through real-world case studies and applied learning, participants will gain practical skills to assess and manage forest carbon initiatives in both domestic and international contexts. The program is ideal for those seeking to diversify their expertise and contribute to climate action through sustainable forest practices.

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 document summarizes key findings from two long-term silvicultural research initiatives: the Montane Alternative Silvicultural Systems study and the Variable Retention Adaptive Management experiments. The MASS study, spanning 25 years, compared clearcutting to various alternative methods, revealing that tree growth was best in clearcuts, though other methods offered biodiversity benefits and paved the way for variable retention. The VRAM research explored different retention strategies, identifying windthrow as a significant challenge and demonstrating that retention provides crucial life-boating habitat for various species, with the amount, aggregation, and size of retained areas being critical factors. The research highlights that while increased canopy retention and dispersion can impact tree growth, these alternative systems offer important ecological advantages, particularly for understory vegetation and diverse species.

The Malcolm Knapp Research Forest mission is to provide a world class environment for research and education in forestry and allied sciences. It is located near Maple Ridge and is close enough to UBC campus for students to visit for field trips or project work. The UBC Malcolm Knapp Research Forest has a thriving research community which includes professional researchers and students from several UBC faculties, from Simon Fraser University, from BC's provincial government, and from the Canadian federal government. Since the establishment of the Research Forest, over 900 research projects have been initiated on the land-base, and more than 100 of these are still active. Many of these active projects are long-term in nature, spanning close to 50 years and including some of the most extensive datasets in western North America. While the majority of the projects focus on different aspects of forestry and forest management, several of the more recent projects touch on other, unrelated fields, such as astronomy and forensic entomology. The last 10 years has seen a shift in the focus of forestry research, from projects looking predominantly at maximizing growth and yield in managed forests, to projects which are more concerned with measuring impacts of different forest practices on the ecology of our forests. Studies of growth and yield continue, however, and these projects include some of the longest datasets the research forest has. For a full list of research projects being pursued at the Research Forest, please check the Research Projects Database found at https://rpd.forestry.ubc.ca/auth

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 study investigates different methods for assessing the effects of controlled burning in a harvested forest area. The study compares the utility of satellite imagery, fire behavior modeling, unmanned aerial vehicle image analysis, and ground-based measurements in evaluating burn severity, fuel consumption, and impacts on surface conditions and vegetation. The report aims to identify accurate and efficient techniques for understanding and managing the ecological consequences of broadcast burning for land management purposes.

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 document serves as a comprehensive manual for forest professionals, outlining best practices for thinning operations effective April 2025. Its primary purpose is to support sustainable forest management by providing science-based guidelines for developing and implementing thinning prescriptions, particularly for enhancing timber production and quality. The guidance emphasizes maintaining ecological and social objectives while focusing on operational efficiency, minimizing environmental impacts, and promoting innovative approaches. It also details the required data collection and monitoring processes to ensure the effectiveness and compliance of thinning activities, thereby fostering healthy, resilient forest ecosystems across British Columbia.

This extension note introduces Equivalent Clearcut Area, a metric used to assess the potential impact of forest disturbances, like logging or fires, on watershed hydrology in snow-dominated regions of British Columbia. The document explains how ECA is calculated by accounting for the area disturbed and the subsequent forest regrowth, which influences water interception, evaporation, and transpiration. It details the historical development and application of ECA in forest management planning, highlighting its use as an indicator for potential changes in streamflow and peak flow events. While acknowledging ECA's utility as a simplified tool for risk assessment and comparing management options, the note also stresses its limitations, emphasizing that it should not be used as a stand-alone metric due to the complex and variable nature of watershed responses to disturbance.

This research models the impact of forest harvesting on peak streamflows in a small, snow-dominated watershed in British Columbia. Using a sophisticated hydrological model, the study simulated various clearcutting scenarios to understand how the removal of forest cover influences the magnitude and frequency of high flow events. The findings indicate that forest harvesting consistently increases peak flows, with larger, less frequent events showing a more significant response, though the predicted increases were less than 50% even with complete forest removal. The study highlights the importance of watershed characteristics like topography and size in determining the extent of these changes and emphasizes the ongoing need for research to improve water resource management in forested areas.

This document details a study using the TASS II growth model to assess how different forest management techniques impact the timber production of lodgepole pine in mixed stands with aspen. Prepared for the Interior Broadleaf Working Group, the report simulates various scenarios involving different densities of aspen and several treatments like brushing at different ages and herbicide application. The core purpose is to provide guidance on choosing the most effective brushing strategies to maximize conifer timber objectives in the Prince George Timber Supply Area, by analyzing the projected growth and yield of lodgepole pine under these varying conditions. The study meticulously examines factors such as site index, height growth, tree survival, and ultimately, the merchantable volume of pine achieved with and without intervention.

This document explores the impact of broadleaf cover, specifically aspen stands, on the size of wildfires in British Columbia. Employing fire behavior modeling, the authors examine how varying extents of aspen-dominated landscapes can act as a natural fence to impede fire spread under different weather conditions, including extreme scenarios. Furthermore, the report delves into fuel succession dynamics in aspen stands, highlighting how their effectiveness as firebreaks changes over time as they mature and are replaced by conifers. This work considers the strategic scheduling of landscape vegetation to leverage aspen's fire-resistant properties for proactive fire management.

This document presents a study investigating how different methods of controlling aspen growth impact the future yield of white spruce and lodgepole pine. The research utilizes the Mixedwood Growth Model for British Columbia to simulate various scenarios, including different initial aspen densities and brushing treatments. By comparing the resulting timber volumes and mean annual increment at a rotation age of 75 years across different subzone site series, the study aims to identify the most effective brushing approaches for maximizing the productivity of the coniferous species in mixedwood stands.