Pith-to-bark increment cores were obtained at breast height from 199 interior Douglas-fir parent trees located in the east Kootenay region of British Columbia. The cores were divided into equal lengths and were analyzed separately for wood density. The half portion close to the pith (inner half) was used to estimate the juvenile wood density; the outer half was used to estimate the wood density of the mature volume of the tree. The outer half was significantly higher in wood density than the inner half. When compared to other parent trees of the same species located in other interior seed zones, the outer half of these east Kootenay trees had significantly lower wood density.
The species averages for wood density of Canadian trees and standing timber volumes currently listed in the ASTM standard method D2555 are based on old surveys. When compared to two studies more recently conducted on the wood density of British Columbia- and Ontario-grown trees, the ASTM values suffered from much smaller sample sizes and shortage of data from the Ontario region. The ASTM values could be augmented or replaced with data from the British Columbia study to increase the precision in the estimates of the species population parameters. Data from the Ontario study should be used as supplementary information. The standing timber volumes for Canadian species in the ASTM are based on 1965 statistics and should be updated with the 1990 forest inventory compiled by Forestry Canada.