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Published bySandra Fisher Modified over 9 years ago
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Young-Stand Management Options and their Implications for Wood Quality and Other Values by Jamie Barbour, PNW Research Station; Richard Zaborske, USFS Washington Office; Michael H. McClellan, PNW Research Station; Linda Christian, Region 10; Don Golnick, Region 10.
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Road Map for Talk Wood quality what is it & what endures? SEA information (empirical & simulated) My views on what available information means
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Southeast Alaska Current Situation Resource = old-growth Issue = costs Challenges –too much low quality –how to manage young stands
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Current Resource Log Grade Check Scale 1999 + 1 st quarter 2000 Spruce = 17% of harvest Hemlock = 55% of harvest
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Southeast Alaska Future Situation Resource = young-growth Issue = costs Challenges –less high grade –competing in world markets
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Wood Quality What’s Important? Knots Tree size Soundness Growth rate Stem straightness Basic wood properties Proximity to processing facilities & markets
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Wood Quality Characteristics What’s Especially Important in SEA? Knots Tree size Soundness Growth rate Stem straightness Basic wood properties Proximity to processing facilities & markets
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Size and Quality Processing Streams Structural Products Lumber Posts & Poles Veneer Particle and Fiber Panel Products Pulp and paper Energy production Chemicals Heat Appearance Products
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Open Grown Tree JW MW JW Tree from Dense Stand Wood Quality and the Crown
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4”6”8” S.Str. No. 2 No. 3 No. 1 1” 1.5” 2” Knot Size, Lumber Width, & Lumber Grade
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Existing Information on Young-Growth Green and Kilborn, lumber grade and log grade. Wang et al., thinning and mechanical properties. Christensen et al., thinning and lumber grade.
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Stiffness (MOE) and Thinning Southeast Alaska Thinning Intensity Wang et al. 2001 HeavyMediumLightControl
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Southeast Alaska Young-Growth Spruce Mechanical Properties Christensen et al., 2002 Published Value
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Southeast Alaska Young-Growth Hemlock Mechanical Properties Christensen et al., 2002 Published Value
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Southeast Alaska Young-Growth Volume Recovery Christensen et al., 2002
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Southeast Alaska Young-Growth Sitka Spruce Lumber Grades Christensen et al., 2002
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Southeast Alaska Young-Growth Hemlock Lumber Grades Christensen et al., 2002
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Current Study Simulate 4 prescriptions using FVS Three harvest ages Two site classes
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Current Study Assumptions Generalize Christensen et al. results Branches last 50 to 80 years Lumber or veener will be important
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Ketchikan Area Site Class 60 and 90 Cubic Foot Log Volumes 70 Years110 Years150 Years
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Ketchikan Area Site Class 60 and 90 Normalized Log Volumes 70 Years
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Ketchikan Area Site Class 60 and 90 Normalized Log Volumes 110 Years
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Ketchikan Area Site Class 60 and 90 Normalized Log Volumes 150 Years
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MBF/ac So What! PCT A & PAS always produce most volume Some differences even out over time Important differences remain among site classes
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Ketchikan Area Site Class 60 and 90 Lumber Revenues 70 Years110 Years150 Years
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Ketchikan Area Site Class 60 and 90 Normalized Lumber Revenues 70 Years
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Ketchikan Area Site Class 60 and 90 Normalized Lumber Revenues 110 Years
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Ketchikan Area Site Class 60 and 90 Normalized Lumber Revenues 150 Years
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$/ac So What! Volume buys a lot Volume is not everything
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Ketchikan Area Site Class 60 and 90 Average Lumber Revenues per MBF 70 Years 110 Years 150 Years
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What’s All This Mean? Branch Size Trees grown at wide initial spacings or thinned early tend to have large branches Large branches limit wood product potential
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What’s All This Mean? Mechanical Properties Later thinning does not seem to adversely affect mechanical properties Mechanical properties of both spruce and hemlock suffer from wide early spacings
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What’s All This Mean? Lumber Grades Later lighter thinnings result in smaller trees with better lumber grades Earlier heavier thinnings result in larger trees sooner but only average lumber grades If our assumptions are correct the no thinning prescription might result in the best quality at 110 or 150 years.
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What’s All This Mean? For private landowners it comes down to questions about cash flow and return on investment For public landowners it comes down to questions about jobs, subsidies, and ecological function
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Jamie Barbour 503-808-2542 jbarbour01@fs.fed.us
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