Impact of Paper Birch (Betula papyrifera) Tree Characteristics on Lumber Color, Grade Recovery, and Lumber Value

The aim of this research is to assess the impact of paper birch (Betula papyrifera Marsh.) tree characteristics on wood color variability, grade recovery, and lumber value. Current results are based on 2,284 paper birch boards coming from 168 trees harvested in two different stands in Quebec, Canada. Results showed that tree diameter was the most important variable affecting board quality and value. Larger trees were associated with higher board quality and higher lumber value per tree. Lumber value per tree was influenced by tree vigor as well but not by tree age. The most vigorous trees produced higher board value with an average of USD 316.62 per m3, middle vigor classes showed averages of USD 218.28 per m3 and USD 251.84 per m3, while the less vigorous trees had the lowest average with USD 165.94 per m3. Board quality was only partly influenced by tree age and tree vigor. When selected for color, the majority of the board surface area fell under the sap category (50%), while 28 percent was classified ...