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FOR 406

Silvicultural Use of Prescribed Fire. FOR 406. Harvest. Regenerate. The Silvicultural Cycle. Tend. Prescribed burning is. Fire. Applied in a skillful manner At a definite location & time Under pre-defined weather conditions To achieve specific management objectives.

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FOR 406

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  1. Silvicultural Use of Prescribed Fire FOR 406

  2. Harvest Regenerate The Silvicultural Cycle Tend

  3. Prescribed burning is... Fire • Applied in a skillful manner • At a definite location & time • Under pre-defined weather conditions • To achieve specific management objectives Anything else is a Wildfire

  4. Pines Western larch Douglas-fir Giant sequoia

  5. Oaks Eucalyptus

  6. “Fire and life, in brief, form a necessary kind of symbiosis.” Stephen Pyne

  7. WILD

  8. Healthy Forests Restoration Act 2003

  9. A fire is not a fire…

  10. Surface Fire

  11. Ground Fire

  12. Crown Fire

  13. Frontal Fire Intensity I (kW m-1) = 2.598 L2.174 I (kW m-1) = 300 L2

  14. WIND Average flame length

  15. ~1.0 m I = 300 kW m-1 ~0.5 m I = 58 kW m-1 Low Intensity

  16. ~0.5 m I = 75 kW m-1 Low Intensity

  17. ~91 m I = 2,484,300 kW m-1 High Intensity High Intensity High Intensity High Intensity

  18. <1.0 m (3 feet)

  19. Why use prescribed fire? • Reduces hazardous fuels

  20. Why use prescribed fire? • Controls woody understory

  21. Why use prescribed fire? • Controls woody understory

  22. Why use prescribed fire? • Stimulates natural regeneration & increases diversity of ground flora

  23. Why use prescribed fire? • Improves wildlife habitat & livestock forage

  24. Why use prescribed fire? • Controls certain insects & diseases

  25. Why use prescribed fire? • Recycles nutrient cations (Ca, Mg, P, K) & stimulates N fixation

  26. Why use prescribed fire? • Restores a natural (pre-European settle-ment) ecological process

  27. Why use prescribed fire? • Enhances aesthetics & improves access

  28. Why use prescribed fire? • Watch it burn!

  29. Weather • Fuel moisture • Fire behavior

  30. Weather Good forecastsare essential!

  31. Weather for prescribed fire • Wind • Speed & direction steady • 5 mph or less in the stand • Direction more important than speed • Interacts with topography

  32. Weather for prescribed fire • Wind • Speed & direction steady • 5 mph or less in the stand • Direction more important than speed • Interacts with topography

  33. Weather for prescribed fire • Relative humidity • 25 to 40% RH M N M

  34. Weather for prescribed fire • Temperature • <90o F (35o C) • Lethal temperature for plant tissue ~145o F • High temperature dry fuels quickly

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