Forest Investment Account (FIA) - Forest Science Program
FIA Project L077006

    Shelterwood silvicultural systems to address integrated resource management issues: long term maintenance
Project lead: Waterhouse, Michaela (BC Ministry of Forests and Range)
Contributing Authors: Paragon Resource Mapping (2004) Inc.; Waterhouse, Michaela J.
Imprint: [BC]:, 2007
Subject: Forest Investment Account (FIA), British Columbia
Series: Forest Investment Account (FIA) - Forest Science Program
This project links two long-term, shelterwood silvicultural systems trials and one small group selection trial in the southern interior of BC. Although the trials were initiated for different reasons, visual constraints and root disease in the ICH, and species conversion in the SBS, there are similar goals and treatments in the trials. Both shelterwood trials examine uniform shelterwood harvesting systems (basal area retention, type of removal, marking) and regeneration success which will influence stocking and free growing policy standards. Data from the trials can address wildlife and biodiversity issues. The SBS trial, initiated in 1990, was designed to attain natural Douglas-fir regeneration through the use of uniform shelterwood silvicultural systems, due to poor survival due to frost in clearcuts. The ICH shelterwood trial was initiated in 1993 because a significant percentage of the landbase was being harvested with partial retention systems to meet guidelines for visual, ungulate habitat and other values. There are serious management questions about the productivity (tree growth and yield), regeneration, and future health of these forests, especially as a large portion of the area is infected with root disease such as Armillaria ostoyae and Inonotus tomentosus. A third project (EP1191) is associated with the ICH trial. It specifically looks at survival and growth response of ten tree species to Armillaria and micro-environments that control tree survival and growth (light and moisture etc.). The SBSdw trial (EP1104.01) is a randomized complete block design with each treatment replicated on 3 sites (50 km NE of Williams Lake). After two harvesting entries (1991 and 2001), there are 5 treatments of basal area retention of 15, 20, 30, 40 and 60 mē. Each treatment unit is 1.4 ha. The ICH trial (EP1186) is replicated twice on two sites (one in the ICHmk1(Golden) and the other in the ICHmw2 (Nakusp)) based on a completely randomized design. Treatments include two types of logging: push-over and conventional handfalling, each with 4 levels of residual basal area retention: 0, 15, 30 and 60mē. The 32 treatment units are 1 ha each and were harvested in 1995 (Mt.7) and 1996 (Ice Road). Both studies include measurements of regeneration, residual overstory and vegetation. In the ICH trial, there are additional plots were placed in root disease centers to monitor seedling response. In the SBSdw project windfall, snow interception, seedfall and microclimate studies are ongoing. Both trials have Ministry of Forests – peer-reviewed Working Plans that contain detailed methodology. The SBS trial is Experimental Project EP1104.01 (Waterhouse 2001 update) and the ICH trial is EP1186 (Pollack 1997). The third project (EP1191 – Burton Creek) has 2 – 1ha openings (50 m x 150 m) and is located near Nakusp, BC. A working plan was prepared by Delong et. al. in 1995. • Delong, D., I. Cameron, C. Thompson, and P. Puttonen. 1995. Establishment and development of mixed species stands across a range of micro-environments in the ICHmw2. Working Plan. Ministry of Forests, Victoria, BC • Waterhouse, M.J. 2001. Uniform shelterwood systems for even-aged Douglas-fir & lodgepole pine stands in the sub-boreal spruce subzones in the CFR. MOF Working Plan for EP1104.01 • Pollack, J. Partial cutting research in root rot infected stands: EP1186. Working Plan. Ministry of Forests, Victoria, BC The projects are relevant to FSP theme areas: Timber Growth and Value Program: 2.0 Design and analysis of silvicultural systems 2.1 Complex stands including partial cutting, variable retention Timber Growth and Value Program – 1.0 Basic research on tree growth and stand development 1.1 Microclimate effects related to tree and stand growth in multi-storied stands. Mountain Pine Beetle Research: Timber Growth and Value Program – 4.1 Stand and forest dynamics following MPB and in particular topic (a) – Quantification of stand and forest change and development following MPB and impacts on timber supply. Evaluating and estimating timber growth implications on residual trees and regenerated stands in the understory, including species interactions related to the scale and pattern of harvesting.


Experimental Project (EP1191) (52Kb)
Experimental Project (EP1186) (73Kb)
EP1191 Yale Research Trail Map (0.3Mb)
EP1186 Ice Road Installation Map (0.4Mb)

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Updated August 16, 2010 

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