Canadian Forest Service Publications
The distribution of Douglas-fir foliage by age. 1962. Silver, G.T. Forestry Chronicle 38(4): 433-438.
Issued by: Pacific Forestry Centre
Catalog ID: 23884
Availability: PDF (download)
The percentage of Douglas-fir, Pseudotsuga menziesii (Mirb.) Franco, foliage by age was calculated for four trees for four consecutive years. The percentage of foliage for the five youngest years was 28, 23, 17, 13, and 10 per cent, respectively. Distribution of foliage by age was fairly uniform within individual branches. Although there was considerable variation between crown levels, trees, and years, the averages were reasonably uniform.