The effects of tree position and silvicultural practices on treatability of Douglas-fir lumber Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/2n49t429z

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  • In spite of the lack of accurate information about the treatability of western wood species with waterborne wood preservatives, consumption of these products continues to increase. Western wood species, notably Douglas-fir, are notoriously difficult to treat with waterborne systems, yet there is relatively little data on the effects of wood characteristics on treatment. In this study, Douglas-fir grown under various silvicultural regimes and collected through a stand management cooperative, was treated with ammoniacal copper zinc arsenate (ACZA) or chromated copper arsenate (CCA) to determine the effects of wood and stand characteristics on treatability. Nine geographic locations within the Pacific Coastal region and 3 different silviculture regimes (none, thinned, thinned and fertilized) were studied. Geographic location and prior silvicultural practices were associated with significant effects on treatment of wood from some sites. ACZA or CCA treatability did not significantly differ with position in the tree, but there were significant differences in CCA or ACZA treatability with juvenile wood percentage. These patterns were not consistent in CCA treatments. These results suggest that some silvicultural practices such as thinning or fertilizing may impact wood characteristics which in turn affect treatability.
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