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Group Selection Harvests, Patch cuts

This guide explores the principles of group selection and its implementation in forestry practices. It delves into multi-cohort management, examining age structure, species composition, and disturbance regimes. Key topics include the impact of partial disturbances on tree height and overstory density in both full sun and full shade environments. Additionally, the text provides methods for estimating the area impacted by forestry activities, evaluating yield over time, and discussing regeneration techniques, including natural and planting methods. Effective vegetation management strategies and equipment options are also highlighted.

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Group Selection Harvests, Patch cuts

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  1. Group Selection Harvests,Patch cuts

  2. Objectives • To understand the concepts behind group selection • To understand how to set-up group selection cuts in the field

  3. Multi-cohort Management • Age structure • Species composition • Disturbance regime

  4. Partial disturbances

  5. dead Tree height Full Sun Overstory density Full shade Stand Age

  6. Tree height Full Sun Overstory density Full shade Stand Age

  7. EDGE UNCUT OPEN GAP

  8. Role of impacted area

  9. Role of impacted area

  10. Estimate of impacted area y x x+y

  11. Area lost =  x2 Total area impacted =  (x+y)2 Area with reduced growth (edge) = [ (x+y)2 -  x2] or [2xy + y2] y x x+y

  12. “Swiss cheese”

  13. Yield Time Yield

  14. Total yield Yield Time

  15. Regeneration • Natural • Planting

  16. Slash disposal • Pile and burn? • costly

  17. Veg Management • Difficult • Usually manual

  18. Precommercial thinning • Inefficient • Can only cover part of the area

  19. Equipment • Skidders • Cable

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