Canadian Forest Service Publications

Stand-level effects of the mountain pine beetle outbreak in the central British Columbia interior. 2007. Hawkins, C.; Rakochy, P. Natural Resources Canada, Canadian Forest Service, Pacific Forestry Centre, Victoria, BC. Mountain Pine Beetle Initiative Working Paper 2007-06. 14 p.

Year: 2007

Available from: Pacific Forestry Centre

Catalog ID: 26808

Language: English

Series: Mountain Pine Beetle Working Paper (PFC - Victoria)

CFS Availability: Order paper copy (free), PDF (download)

Abstract

Pure pine stands were sampled in the Sub-Boreal Spruce biogeoclimatic zone (SBS) dry cool subzone; dk) in 2004 (48 stands, more than 300 plots) and pine-leading stands were sampled in the SBSdw2 (Blackwater dry warm subzone), SBSdw3 (Stuart dry warm subzone), and SBSmc3 (Kluskus moist cold subzone) in 2005 (74 stands, more than 370 plots) in the central British Columbia interior to document changes in stand characteristics of pine-dominated stands following mountain pine beetle attack and to assess the potential of stand development after beetle attack without management intervention. About 5% of trees less than 10.0 cm diameter at breast height were attacked, and attack rates greater than 80% were observed in trees with diameters at breast heights equal or greater than 20 cm. As stand densities increased, beetle attack rates decreased. Vigorous, widely spaced, young stands may be at a greater risk to mountain pine beetle attack than was previously believed. The impact of beetle attack depended on the stands' species composition prior to attack. Pure pine stands in the SBSdk had post-attack mature stocking at minimum levels (542 stems per hectare (sph), of which 440 sph were pine), whereas pine-leading stands were well stocked (1078 sph, of which 760 sph were not pine). If mountain pine beetle attack continues in pure pine stands, they will not be stocked. There also was significantly less regeneration in pure pine stands sampled in 2004: 325 sph versus 2000 sph in the 2005 samples. Without management intervention, the stands in the SBSdk will likely not contribute to the mid-term timber supply, whereas stands from the SBSdw2, SBSdw3 and SBSmc3 potentially can contribute both to the mid- and long-term timber supply.

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