Graduate Thesis Or Dissertation
 

The influence of seed source origin and phenological characteristics on wood quality in a young Douglas-Fir Provenance Plantation

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  • The relationships of several wood quality traits with seed origin and phenological characteristics, measured at a young age, were tested from six seed sources in a young Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) provenance plantation. The wood quality traits measured were wood density, uniformity of wood density, percentage latewood, fiber length, Runkel ratio, and holocellulose content. Data for each seed source concerning the phenological characteristics of bud bursting time, bud set time, and needle length during the second growing season, were obtained from an earlier study. Seed origin data concerning the latitude and elevation of each seed source were also obtained from an earlier study. As an estimate of mature wood properties the outer three annual rings (most samples contained ten rings) away from the pith were used. It was hoped that these relationships would show possible predictors of mature wood properties from young seedlings. Such predictors could be used as selection criteria for out planting seedlings with desired wood properties or as early indicators of the genetic influence on wood properties in genetic experiments. The overall average wood density, uniformity of wood density, percentage latewood, and annual ring width were measured for each of the six seed sources. These measurements were used to test the influence of seed origin or phenological characteristics (measured at age two) on juvenile wood formation. These same traits were measured ring by ring, from pith to bark, in each of the seed sources in an attempt to explain some of the results encountered. The latitude of seed source origin showed a significant relationship with mature wood fiber length indicating strong genetic control. Time of bud set appeared to have an influence on holocellulose content in mature wood. Needle length showed a significant negative correlation with average wood density but not mature wood density, indicating it may have some influence on wood formation but may not be used as a predictor of future wood properties. From the variation patterns in wood density, uniformity of wood density, percentage latewood, and ring width from pith to bark it appeared that a possible relationship between wood formation and crown-development may exist.
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