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Applying Density Management to Develop Late Successional Features

Applying Density Management to Develop Late Successional Features. Klaus J. Puettmann Oregon State University. Studies. Late successional features:. Overstory cover Canopy layers Large, dominant trees Tree species mixtures, including hardwoods

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Applying Density Management to Develop Late Successional Features

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  1. Applying Density Management to Develop Late Successional Features Klaus J. Puettmann Oregon State University

  2. Studies

  3. Late successional features: • Overstory cover • Canopy layers • Large, dominant trees • Tree species mixtures, including hardwoods • Amount and composition of understory vegetation • Conifer regeneration • Spatial variability

  4. Late successional features: • Overstory cover • Canopy layers • Large, dominant trees • Tree species mixtures, including hardwoods • Amount and composition of understory vegetation • Conifer regeneration • Spatial variability

  5. OverstoryCover Willamette National Forest: Douglas-fir Beggs 2005

  6. Overstory cover McDonald Forest: Douglas-fir, previously thinned Newton and Cole 2004

  7. Crown structures Suislaw National Forest: Douglas-fir Chan et al. 2005

  8. Foliage Height Diversity Index 35 m 30 m 25 m 20 m 15 m 10 m 5 m 0 m < < STAND 1 STAND 2 STAND 3

  9. Foliage Height Diversity Index 3 to 5 years after thinning Beggs 2005

  10. Impact of thinning on volume and on growth rate (i.e., slope of volume curve)

  11. Acceleration of “dominant old-growth” trees: Diameter growth of largest 6 tpa Growth (cm / yr) Willamette National Forest Beggs 2005

  12. Overstory Mortality (%) Mostly competition related Beggs 2005

  13. Late successional features: • Overstory cover • Canopy layers • Large, dominant trees • Tree species mixtures, including hardwoods • Amount and composition of understory vegetation • Conifer regeneration • Spatial variability

  14. Late successional features: • Overstory cover • Canopy layers • Large, dominant trees • Tree species mixtures, including hardwoods • Amount and composition of understory vegetation • Tree regeneration • Spatial variability

  15. Seedling survival 8 growing seasons after thinning Adapted from Maas-Hebner et al. 2005 FEM

  16. Seedling survival after 8 growing seasons Adapted from Maas-Hebner et al. 2005 FEM

  17. Seedling survival McDonald: Douglas-fir Newton and Cole 2004

  18. Harvesting damage to regeneration McDonald Forest Newton and Cole 2004

  19. Impact of light availability on seedling growth Maas-Hebner et al. 2005

  20. Impact of overstory density Western Hemlock Newton and Cole 2004

  21. Effects of weed control Western hemlock Blodgett Newton and Cole 2004

  22. Variation in overstory cover when gaps in interspersed in thinned stands 40 35 30 25 Frequency 20 15 10 5 0 0 10 20 30 40 50 60 70 80 90 100 Overstory Cover (%) Beggs 2005

  23. Conclusions • Different late-successional components require different management strategies • Tradeoffs in terms of stand growth • Overstory and understory conditions before thinning are good indicators of responses • Some flexibility in thinning intensities • Repeated entries likely required

  24. Density management needs to be an integral part of managing for late successional habitat, but additional measures, (gaps, snag creation, or remnant trees) are also necessary

  25. Questions

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