Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Basic wood properties of second-growth Western hemlock.

Abstract

This report describes some of the background and results of work done to date on second-growth western hemlock (Tsuga heterophylla) basic wood properties at Forintek Canada Corp. The B.C. Ministry of Forests Research Branch, UBC Forestry Faculty and PAPRICAN were the other cooperating agencies on this project and they investigated live crown/tree growth relationships, strength properties of small clears, and pulping properties, respectively. Properties that were assessed by Forintek, both within and between trees, include: relative density of wood, shrinkage, moisture content, relative proportions of heartwood-sapwood, bark thickness, content and distribution of compression wood, incidence and degree of spiral grain, incidence and severity of brown stain, and bending strength of small clear samples. Naturally-grown 90-year-old western hemlock stands represent much of the emerging timber supply in the B.C. coastal forest region. Information characterizing the commercial quality of this resource is needed now to support processing and marketing decisions and for product promotion. In addition, the Ministry of Forests and industry members are making stand management decisions today that will influence the future quality of western hemlock.