Forest Investment Account (FIA) - Land Base Investment Program
FIA Project 6746006

    Variable Retention Windthrow Monitoring Project - 2001 to 2009
Project lead: Sandford, Jeff (Western Forest Products)
Contributing Authors: Rollerson, T.P.; Peters, Charles M.; Beese, W.J. (Bill)
Subject: Forest Investment Account (FIA), British Columbia
Series: Forest Investment Account (FIA) - Land Base Investment Program
The Variable Retention Windthrow Monitoring project was carried out over an eight-year period, the first two years as a pilot study in what are now the Port Alberni, Queen Charlotte, Port McNeill and Mid Island Forest Operations of Western Forest Products (WFP, formerly Weyerhaeuser BC Coastal Timberlands). We chose a random selection of operational cutblocks in several operations each year during the next six years, including Stillwater and South Island (now Island Timberlands). After the merger with WFP, monitoring was expanded in the final two years to four operations on north-western Vancouver Island: Holberg, Jeune Landing, Gold River and Nootka Sound. We also included nine Variable Retention Adaptive Management (VRAM) experimental areas in the monitoring schedule. VRAM sites compare different approaches to stand-level retention, including group and dispersed retention levels, group sizes, riparian retention and group selection.
The distribution of monitoring sites on representative sites across Vancouver Island (VI), the southern BC mainland coast and Haida Gwaii (Queen Charlotte Islands) facilitates evaluation of coast-wide variation in windthrow that is associated with variable retention (VR) harvesting practices, especially the retention silvicultural system. The wide geographic extent, however, complicates data analysis due to the high spatial variability in terrain conditions and wind regimes among the various study areas.


Final Report (1.6Mb)

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Updated August 16, 2010 

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