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Silvics of Western Hemlock

Silvics of Western Hemlock. Second-Growth Western Hemlock Product Yields Related to Differences in Stand Density Les Jozsa Research Scientist Emeritus. Vancouver Island and the Lower Mainland of BC. Sampling Locations of Second-Growth Western Hemlock (90 years of age). 650/ s/h. 1000 s/h.

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Silvics of Western Hemlock

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  1. Silvics of Western Hemlock Second-Growth Western Hemlock Product Yields Related to Differences in Stand Density Les Jozsa Research Scientist Emeritus

  2. Vancouver Island and the Lower Mainland of BC Sampling Locations of Second-Growth Western Hemlock (90 years of age) 650/ s/h 1000 s/h 1700 s/h (50) 1000 s/h (50) 986 s/h 440 s/h 840 stems/ha

  3. Port Hardy 580 s/ha western hemlock at age 90 Site index of 39m, at age 50, is less than 1% of the coastal western hemlock region!

  4. Not the edge of wheat-field, but 930 s/ha hemlock stand

  5. Sampling Plan of Stem-Wood Characterization

  6. Old-Growth Reference Values of Wood Density

  7. Perspective on Second-Growth Wood Density

  8. Western Hemlock is an INDETERMINATE Species

  9. Density Distribution in Western Hemlock

  10. Average Ring Density Trends

  11. Average Ring Width Trends 6 rings/ inch 8 rings/ inch

  12. Pith-to-Bark Ring Density Trends

  13. 440 Stem per Hectare at Age 90

  14. 1000 Stems per Hectare at Age 90

  15. Stem Shapes and Density Zones at Age 60 and 90

  16. Where do your logs fit within the cube?

  17. Harvesting cost & lumber recovery factor by DBH

  18. Standing Volume at 50 Years of Age ~ 1000 & 1700 s/h

  19. Log Value in Old- Growth and Second- Growth Wh

  20. Strength and Stiffness of 105x105 mm Squares MOE values from two 930 s/ha stands, in all DBH classes (30, 35, 40, and 45 cm) met or exceeded Select Structural code values for Hem-Fir. Lumber from 580 s/ha did not meet SS, but did meet or exceed the No.1/No.2 code values up to 50cm DBH

  21. STRENGTH & STIFFNESS – a primer

  22. Equilibrium Moisture Contents & Relative Humidity

  23. High-Value Hemlock Moulding Rejects (CW)

  24. Along-the-grain shrinkage in compression wood

  25. Pulp and Paper Quality

  26. Second-Growth Western Hemlock Wood Quality • Log and Lumber Grades • Lumber Structural Properties • Mechanical Properties of Small Clears • Treatability • Machining Properties • Veneer and LVL • Pulp properties and Yields

  27. Stand, Tree, Log, Lumber, Wood, Ring, Fibre Quality

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