Canadian Forest Service Publications
Demonstrating growth and yield adjustments (TIPSY OAFs) for Armillaria root disease in a timber supply analysis. 2004. Stearns-Smith, S.; Neinaber, G.; Cruickshank, M.G.; Nussbaum, A. Natural Resources Canada, Canadian Forest Service, Pacific Forestry Centre, Victoria, BC, Copublished by the BC Ministry of Forests.
Issued by: Pacific Forestry Centre
Catalog ID: 31516
CFS Availability: PDF (download)
Application of newly developed operational yield adjustment factors (OAFs) for Armillaria ostoyae (DRA) was demonstrated in a timber supply analyses for the Arrow Timber Supply Area in the southern interior of British Columbia. The OAFs are specific to the managed stand yield table generator known as the Table Interpolation Program for Stand Yields (TIPSY). OAFs were developed for and applied only to Douglas-fir within managed stands in the Interior Cedar-Hemlock Biogeoclimatic Zone. The impacts of three DRA severity distributions were examined in a sensitivity analysis. Since managed stands do not contribute to short-term harvest levels, these DRA OAFs mainly affected the long-term harvest projections. The OAF for medium severity DRA infections reduced long-term harvests by 7.2%. Sources of uncertainty were explored which a decision maker may wish to consider when evaluating the risks associated DRA and application of these OAFs. The analysis highlighted opportunities for mitigating some of the disease's impact on timber supply by continuing to refine management practices and acquiring more information about the disease and its distribution across the landscape.