60 resources found

This technical report evaluates how different timber harvesting methods affect the microclimate of the Chilcotin Plateau to determine the best strategies for preserving threatened woodland caribou habitat. By comparing traditional clearcuts with partial cutting systems, such as group selection and shelterwoods, researchers tracked critical variables including soil temperature, frost frequency, and snow-melt dates over a seven-year period. The study found that while clearcuts offer warmer soils, partial cuts provide a vital sheltering effect that significantly reduces the occurrence and severity of lethal summer frosts for young trees and essential lichens. This document suggests that strategically managing opening sizes and microsite placement can balance the needs of timber production with the environmental conditions necessary to sustain caribou forage and forest regeneration.

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 technical report evaluates the effectiveness of selection harvesting as an alternative to clearcutting within the old-growth temperate rainforests of Vancouver Island. By comparing single-tree and group selection methods, the study examines how these systems maintain an uneven-aged stand structure while meeting reforestation requirements on steep, ecologically sensitive terrain. The research highlights significant operational challenges, noting that safety regulations and the complexities of helicopter yarding often require foresters to adapt their initial harvesting prescriptions. This document concludes that while natural regeneration is abundant, the slow growth rates in shaded environments may require adjusted timelines for achieving free-growing status and long-term forest health.

This extension note documents a long-term research project in British Columbia designed to test the operational feasibility of single tree selection within mixed conifer forests. By comparing different levels of basal area retention, researchers are investigating how various thinning intensities influence timber growth, natural regeneration, and understorey light levels. Beyond wood production, the study evaluates how these harvesting methods impact ungulate winter range by measuring snow interception and forage availability for local wildlife. Thsi document serves as a practical model for managing complex, uneven-aged stands, particularly in areas where foresters must balance timber salvage with long-term ecological health.

This document summarizes a decade of experimentation aimed at balancing timber extraction with the preservation of northern caribou habitat in British Columbia. The document outlines various alternative silvicultural systems, such as irregular shelterwood and group selection, to protect the terrestrial and arboreal lichens essential for caribou winter survival. Beyond wildlife management, the text evaluates how these harvesting methods influence forest regeneration, microclimate stability, and windthrow risk compared to traditional clearcutting. This document serves as a scientific foundation for regional recovery plans and sustainable land-use strategies for threatened species in the Southern Interior Forest Region.

This document evaluates the long-term effectiveness of various silviculture practices and forest management techniques across the Engelmann Spruce-Subalpine Fir zones of British Columbia. By assessing historical research trials and logged areas in the southern interior, the document details why certain methods lead to regeneration success or failure, specifically noting the challenges of competing vegetation and harsh environmental conditions. The document is structured to provide a comprehensive analysis of site preparation methods, planting outcomes, and the quality of remaining trees, ultimately revealing that initial spruce growth is often slow and survival rates are frequently unsatisfactory. This document concludes with strategic recommendations for future study to better understand how elevation and plant competition influence the sustainable recovery of these high-altitude ecosystems.

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 outlines a comprehensive long-term forestry study located near Campbell River, British Columbia, designed to evaluate alternatives to clearcut harvesting in mature second-growth forests. The research compares seven distinct silvicultural systems, ranging from traditional clearcutting to more complex methods like aggregated retention and group selection, to determine their impact on forest resilience and biodiversity. By tracking variables such as timber productivity, harvesting costs, and ecological regeneration, the study aims to identify management strategies that balance economic demands with the preservation of ecosystem services in the face of climate change. Detailed assessments of soil disturbance, vegetation shifts, and tree growth serve as a vital demonstration and experimental resource for foresters and scientists seeking to maintain healthy, multi-use forest landscapes.

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 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 LMH Document #79 outlines the principles and best practices for silvicultural systems in British Columbia, emphasizing a shift toward complex, multi-value forest management in the 21st century. Its primary purpose is to serve as a central reference and conceptual framework for forest professionals to design and implement silvicultural plans that move a stand from its current state to a desired future condition through planned interventions, known as stand development pathways. A crucial and recurring theme is the growing role of First Nations, including their traditional knowledge, values, and stewardship goals, which are integrated alongside ecological, social, and economic objectives. The document provides detailed guidance on technical aspects, such as managing for biodiversity, mitigating risks like windthrow and pests, and utilizing adaptive management for continuous improvement in forestry practices.

This LMH Document #59 outlines a management strategy for mule deer winter ranges specifically within the transition and deep snowpack zones of the Cariboo-Chilcotin region. It's structured in two main parts: the first details winter range management objectives, including long-term spatial goals, access considerations, and stand-level targets for forest structure and species composition, largely employing a group selection silviculture system. The second part provides guidance on planning forest harvests to align with these objectives, offering practical steps and a checklist for implementation, aiming to integrate timber harvesting with the maintenance and restoration of suitable mule deer habitat.

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 webinar explores silvicultural options for managing for mature and old-growth forest conditions across a range of forest and ownership types in the US. The consistency of these strategies with other objectives and programs tied to biodiversity conservation, climate mitigation, and forest adaptation are discussed.

This technical report investigates the potential of variable retention silvicultural systems to manage forests in British Columbia's Nelson Forest Region, aiming to mitigate anticipated reductions in wood supply due to new environmental regulations. The study specifically evaluates how different variable retention methods impact stand productivity and overall wood flow despite the widespread presence of Armillaria root disease. Using the PROGNOSIS growth model, the authors identify low-risk timber types and develop management guidelines to balance timber harvesting with objectives like biodiversity and visual quality and reccomend a more balanced mixture of clearcutting and variable retention approaches to ensure sustainable forest management.

This webinar discusses operationalizing adaptive silviculture for climate change through a multi-site research network. The core purpose of the project is to provide forest managers with real-world, operational examples of integrating climate change adaptation principles into practice, specifically by fostering ecosystem resilience to uncertain futures. The research employs a consistent framework across various forest types, testing three primary adaptation strategies including resistance, resilience, and transition. The webinar details the work at the Minnesota pine site, highlighting local climate vulnerability to drought and the application of these three treatments: simple thinning for resistance, mixed-species restoration for resilience, and aggressive transition management using both native and novel, future-adapted species like Ponderosa pine.

This study aimed to identify viable silvicultural alternatives to conventional clearcutting for promoting successful forest renewal in black spruce stands across the eastern Canadian boreal zone. Researchers evaluated whether partial harvesting techniques, specifically variations of shelterwood and seed-tree cutting, could achieve adequate conifer density over a ten-year period. The results confirmed that these partial harvest methods, when implemented alongside mechanical site preparation such as spot scarification, successfully facilitated sufficient density of black spruce regeneration. The research supports the use of shelterwood and seed-tree systems combined with soil disturbance as effective management strategies for meeting sustainable forest productivity objectives.

This document is a literature review for British Columbia focusing on the relationship between tree wounding and partial-cut harvesting practices. The primary purpose is to provide a consolidated reference on tree damage, wood-decaying fungi, and the resulting losses. The document details the physical response of trees to injury, introducing concepts like compartmentalization of decay in trees, which explains how trees attempt to wall off damage. The document explores how harvesting activities, particularly logging injuries to residual trees, create entry points for various wound parasites and true heartrots, with the severity of decay being strongly influenced by factors like wound size and age, and the location of the injury.

This technical report presents an analysis of a skyline partial cutting operation conducted in British Columbia's Interior Cedar-Hemlock zone. The primary goal was to evaluate the economic and operational feasibility of using a specific cable yarding system to meet modern silvicultural goals in this ecosystem. This report confirmed the importance of careful logging planning and developed productivity functions to help forest engineers predict and optimize the use of single- and multi-span skyline configurations in future partial cuts.