Canadian Forest Service Publications
Survival and yield of Douglas-fir in the Cedar-Hemlock ecosystem of the southern interior of British Columbia. 2016. Cruickshank, M. Forestry: An International Journal of Forest Research, Volume 90, Issue 2, pp 219–233.
Issued by: Pacific Forestry Centre
Catalog ID: 39041
CFS Availability: PDF (download)
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Extended tree lifespans require investments against decay, herbivory, wind and fire. Tree root diseases are global pathogens impacting growth and survival over a large range of tree species. The commercially important conifer Douglas-fir highlights conditions affecting its survival and growth in nine planted and four natural study sites in British Columbia. Planted Douglas-fir ranged from 20-40 years, and natural stands from 63-110 years. Average survival for all tree species in planted stands was 86% after 30 years, with 80% mortality from Armillaria ostoyae. Average survival of Douglas-fir in natural stands was 60% at age 90 with 86% mortality from A. ostoyae. Mortality began in planted stands about tree ages 6-10, and in most natural stands about tree ages 55-65. Stand age, site index, proportion of Douglas-fir, precipitation, and temperature, but not stand density, accounted for most of the hazard. Percent dead trees were correlated with percent plot basal area losses at 1 to 1 ratio in both stand types. Larger planted Douglas-fir trees had greater hazard sooner up to age 30 than smaller trees. Rapid early tree growth likely caused extensive root contact with fungal stump inoculum. Older and larger trees were affected by interacting climate limitations and disease status.