Forest Investment Account (FIA) - Forest Science Program
FIA Project Y082011

    Forest regeneration, growth and development under seven silvicultural systems
Project lead: de Montigny, Louise (BC Ministry of Forests and Range)
Subject: Forest Investment Account (FIA), British Columbia
Series: Forest Investment Account (FIA) - Forest Science Program
This project will determine how the stand growth, regeneration and development are affected by residual stand structures and the corresponding light availability under 7 different silvicultural systems 5 years after harvesting. All data collection was done at the STEMS 1 (Silviculture Treatments for Ecosystem Management in the Sayward) experiment where the 7 different treatment regimes include: Extended Rotation (control); Extended Rotation with Commercial Thinning; Uniform Dispersed Retention; Aggregate Retention; Group Selection; Modified Patch Cuts and Clearcut with Reserves. Each of these treatment units is operational in size, from 10 to 35 ha. There are from 15 to 27 growth and yield (GY) assessment plots per treatment unit and 4 regeneration/vegetation (R/V) plots within each GY assessment plot for a total of 142 GY plots and 568 R/V plots. The large number of assessment plots provide a high degree of reliability for estimates of within and between treatment variability. This experiment has true replication at different sites: the first replicate (STEMS 1) where this proposed sampling will be done, is located in the Snowden Demonstration Forest; a second replicate (STEMS 2), is located at Elk Bay and harvested by Interfor in 2005; and a third replicate will be harvested in 2008 by BC Timber Sales. In addition, there are 3 replicates established in the Capital Forest near Olympia Washington as part of “Silvicultural Options for Harvesting Douglas-fir Young-Growth Production Forests”, initiated and developed jointly by the managers of the Washington State Department of Natural Resources and the scientists of the Pacific Northwest Research Station. Replication of the treatment units across 3 sites in BC, and 3 in Washington result in high statistical power which will enhance the robustness of the results and increase the confidence in the interpretation and recommendations and will allow extrapolation from stand level to landscape level over a wide geographic area. Activities for this year include analysis, reporting and extension relating to: • Analysis of five-year growth for residual trees, planted trees, natural regeneration, and understorey vegetation species, growth and vigor for each treatment unit at STEMS 1; • Five-year summaries of occurrence of windthrow, tree damage, disease and mortality by treatment unit; • Analysis correlating differences in light availability across a range of residual tree densities and by treatment units with the growth and development of planted seedlings, natural regeneration and other vegetation. This information will contribute directly to calibrating or validating new complex stand and windthrow models that will be used in guiding policy, regulations and guidelines for the sustainable use of forest resources; enhancing forest management plans, practices and decision-making that use partial cutting alternatives; and improving the confidence of the public and global community that BC has the ability to manage and produce goods from the forest resource in a sustainable manner.
Related projects:  FSP_Y071011
Contact: de Montigny, Louise, (250) 387-3295,


Executive Summary (22Kb)

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Updated August 16, 2010 

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