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Fertilizing Interior Forests: the scientific basis (and some informed speculation)

Fertilizing Interior Forests: the scientific basis (and some informed speculation). Rob Brockley B.C. Ministry of Forests and Range Kalamalka Forestry Centre Vernon, BC. Why fertilize?. Why fertilize?. Every tree to be harvested in the next 40-60 years is in the ground today.

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Fertilizing Interior Forests: the scientific basis (and some informed speculation)

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  1. Fertilizing Interior Forests: the scientific basis (and some informed speculation) Rob Brockley B.C. Ministry of Forests and Range Kalamalka Forestry Centre Vernon, BC

  2. Why fertilize?

  3. Why fertilize? • Every tree to be harvested in the next 40-60 years is in the ground today

  4. Why fertilize? • Every tree to be harvested in the next 40-60 years is in the ground today • Forest fertilization is a proven silvicultural treatment for accelerating the operability of established stands without sacrificing harvest volume

  5. Why fertilize? • Every tree to be harvested in the next 40-60 years is in the ground today • Forest fertilization is a proven silvicultural treatment for accelerating the operability of established stands without sacrificing harvest volume • Fertilization can be used strategically to impact the amount and timing of future harvest

  6. How fertilization mitigates MPB mortalityConceptual Harvest volume 0 years from now 250 MPB mortality area Area age class distribution

  7. How fertilization mitigates MPB mortalityConceptual • Fertilizing 30- to 70-year-old stands (blue) can increase harvest volumes 20–40 years from now Harvest volume 0 years from now 250 MPB mortality area Area age class distribution

  8. How fertilization mitigates MPB mortalityConceptual Harvest volume • Fertilizing 30- to 70-year-old stands (blue) can increase harvest volumes 20–40 years from now • Fertilizing 15- to 30-year-old stands (yellow) can increase harvest volumes 40–70 years from now 0 years from now 250 MPB mortality area Area age class distribution

  9. Fertilization research in the BC interior • Lodgepole pine

  10. Fertilization research in the BC interior • Lodgepole pine • ~ 70 screening trials

  11. Fertilization research in the BC interior • Lodgepole pine • ~ 70 screening trials • ~ 50 area-based trials

  12. Relative 6-year BA response following N fertilizationRelative cumulative frequency distribution (n=46)

  13. Relative 6-year BA response following N fertilizationRelative cumulative frequency distribution (n=46)

  14. Relative 6-year BA response following N fertilizationRelative cumulative frequency distribution (n=46)

  15. Relative 6-year BA response following N fertilizationRelative cumulative frequency distribution (n=46)

  16. Relative 6-year BA response following N fertilizationRelative cumulative frequency distribution (n=46)

  17. BA response following N and N+S fertilizationRelative cumulative frequency distribution (n=26) N N+S

  18. BA response following N and N+S fertilizationRelative cumulative frequency distribution (n=26) N N+S

  19. BA response following N and N+S fertilizationRelative cumulative frequency distribution (n=26) N N+S

  20. BA response following N and N+S fertilizationRelative cumulative frequency distribution (n=26) N N+S

  21. BA response following N and N+S fertilizationRelative cumulative frequency distribution (n=26) N N+S

  22. BA response following N and N+S fertilizationRelative cumulative frequency distribution (n=26) N N+S

  23. BA response following N and N+S fertilizationRelative cumulative frequency distribution (n=26) N N+S

  24. Effect of N and N+S fertilization on 6-year volume response of lodgepole pine in north-central B.C. EP 886.01 (n=8)

  25. Effect of N and N+S fertilization on 6-year volume response of lodgepole pine in north-central B.C. EP 886.01 (n=8)

  26. Effect of N and N+S fertilization on 6-year volume response of lodgepole pine in south-central B.C. EP 886.01 (n=7)

  27. Effect of N and N+S fertilization on 6-year volume response of lodgepole pine in south-central B.C. EP 886.01 (n=7)

  28. 6-year relative BA response vs. initial foliar N

  29. 6-year relative BA response vs. initial foliar SO4

  30. Lodgepole pine foliar boron concentrationRelative cumulative frequency distribution (n=58)

  31. Lodgepole pine foliar boron concentrationRelative cumulative frequency distribution (n=58)

  32. Lodgepole pine foliar boron concentrationRelative cumulative frequency distribution (n=58)

  33. Effects of N and B fertilization on foliar B concentrationEP 886.05 critical value

  34. Effects of N and B fertilization on foliar B concentrationEP 886.05 critical value

  35. Fertilization research in the BC interior • Lodgepole pine • ~ 70 screening trials • ~ 50 area-based trials • Douglas-fir

  36. Fertilization research in the BC interior • Lodgepole pine • ~ 70 screening trials • ~ 50 area-based trials • Douglas-fir • 5 screening trials

  37. Fertilization research in the BC interior • Lodgepole pine • ~ 70 screening trials • ~ 50 area-based trials • Douglas-fir • 5 screening trials • 6 area-based trials

  38. Fertilization research in the BC interior • Lodgepole pine • ~ 70 screening trials • ~ 50 area-based trials • Douglas-fir • 5 screening trials • 6 area-based trials • Interior spruce

  39. Fertilization research in the BC interior • Lodgepole pine • ~ 70 screening trials • ~ 50 area-based trials • Douglas-fir • 5 screening trials • 6 area-based trials • Interior spruce • 14 screening trials

  40. Fertilization research in the BC interior • Lodgepole pine • ~ 70 screening trials • ~ 50 area-based trials • Douglas-fir • 5 screening trials • 6 area-based trials • Interior spruce • 14 screening trials • 12 area-based trials

  41. Douglas-fir fertilization research

  42. Douglas-fir fertilization research • 5 screening trials (SBS, ICH)

  43. Effects of individual and combined applications of N and “complete mix” fertilizer on 1st year needle mass of Douglas-firEP 886.08 (n=5)

  44. Effects of individual and combined applications of N and “complete mix” fertilizer on 1st year needle mass of Douglas-firEP 886.08 (n=5)

  45. Effects of individual and combined applications of N and “complete mix” fertilizer on 1st year foliar N/S ratio in Douglas-firEP 886.08 (n=5) critical level

  46. Effects of individual and combined applications of N and “complete mix” fertilizer on 1st year foliar N/S ratio in Douglas-firEP 886.08 (n=5) critical level

  47. Douglas-fir fertilization research • 5 screening trials (SBS, ICH) • 6 area-based trials (ICH)

  48. Douglas-fir fertilization research • 5 screening trials (SBS, ICH) • 6 area-based trials (ICH) • 19-34 years

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