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Current and future trends in juvenile wood density for coastal Douglas-fir

Stoehr, M.U., Ukrainetz, N.K., Hayton, L.K., Yanchuk, A.D.
Canadian journal of forest research = 2009 v.39 no.7 pp. 1415-1419
Pseudotsuga menziesii var. menziesii, juvenile wood, wood density, geographical variation, geographical distribution, climatic factors, precipitation, temperature, genetic variation, wood quality, equations, statistical models, British Columbia
Increment cores from 10 full-sib families in each of three planting series were collected on 22 test sites per series (a total of 7063 samples across 63 sites). Juvenile wood density for individual test sites ranged from 0.378 to 0.481. Stepwise multiple linear regression analysis with wood density as the dependent variable and a battery of annual and monthly climate variables as independent variables was used to model the current distribution of wood density across the landscape in coastal British Columbia. Differences in the average temperature between the coldest month and the warmest month, precipitation in July, and the mean annual precipitation were the only significant variables predicting wood density, accounting for 47% of the total variation across all sites. Using two future climate change models (CGCM2 A2x and HADCM3 A2x) to predict changes in the three climate variables, wood density was mapped. Wood density will be reduced generally in the present range of coastal Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco var. menziesii), especially on southern Vancouver Island and along the coastlines of southern British Columbia. This may have implications for the future utility of Douglas-fir as a structural wood species, as well as for breeding and deployment.