The effect of forest stand thinning on selected strength and pulp-ing characteristics of Douglas-fir Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/c821gn182

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  • The purpose of this study was to determine if amount and kind of thinning had an effect on wood specific gravity, modulus of rupture, modulus of elasticity, growth rate, or pulp yield and kappa number. The study involved 24 1/5-acre plots, three plots in each of eight thinning treatments. The treatments were in three groups; constant cutting intensities, increasing cutting intensities, and decreasing cutting intensities. The stand was cut four times from 1963 to 1980. Static bending tests were done on juvenile and mature wood from trees on all plots. Also specific gravities and number of rings per inch were determined. Pulp yields and kappa numbers were also calculated. Statistical analyses showed differences between thinning treatments in specific gravity values of juvenile and mature wood, and in mature wood modulus of rupture. No differences were shown in pulp yield or kappa number due to thinning treatment. Specific gravity and growth rate seemed to influence strength property regressions more than stand density. Growth rate seemed most influential to pulp yield and kappa number regressions. Average MOR and MOE values for the samples tested were 14% and 28% respectively below the Wood Handbook values for coast range Douglas-fir.
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