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Site I - Post Harvest Site II - Pre Harvest Site II - Post Harvest Cumulative Effects

Iron Canyon Soil Monitoring. Site I - Post Harvest Site II - Pre Harvest Site II - Post Harvest Cumulative Effects. Iron Canyon II Feller-Buncher Harvesting August 2003, 23% Soil H 2 0 at 0-60 cm. Iron Canyon II Soil Monitoring Pre- vs. Post-Harvest Disturbance.

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Site I - Post Harvest Site II - Pre Harvest Site II - Post Harvest Cumulative Effects

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  1. Iron Canyon Soil Monitoring • Site I - Post Harvest • Site II - Pre Harvest • Site II - Post Harvest • Cumulative Effects

  2. Iron Canyon IIFeller-Buncher HarvestingAugust 2003, 23% Soil H20 at 0-60 cm

  3. Iron Canyon II Soil Monitoring Pre- vs. Post-Harvest Disturbance Units- Feet (1,000 ft total in transects)

  4. Iron Canyon II Soil Monitoring Pre- vs. Post-Harvest Disturbance Units- Feet (1,000 ft total in transects)

  5. Iron Canyon II Soil Monitoring Pre- vs. Post-Harvest Disturbance Units- Feet (1,000 ft total in transects)

  6. Iron Canyon II Soil Monitoring Pre- vs. Post-Harvest Disturbance Units- Feet (1,000 ft total in transects)

  7. Iron Canyon II Soil Monitoring Pre- vs. Post-Harvest Disturbance Units- Feet (1,000 ft total in transects)

  8. Iron Canyon II Soil Monitoring Pre- vs. Post-Harvest Disturbance Units- Feet (1,000 ft total in transects)

  9. Iron Canyon II Soil Monitoring Pre- vs. Post-Harvest Disturbance Units- Feet (1,000 ft total in transects)

  10. Iron Canyon II Soil Monitoring Pre- vs. Post-Harvest Disturbance Percent Change in Pre-Harvest Classes

  11. Iron Canyon II Soil Monitoring Post-Harvest Disturbance Extent POST PRE

  12. Iron Canyon II Soil Monitoring Post-Harvest Disturbance

  13. Iron Canyon II Soil Monitoring Post-Harvest Disturbance

  14. Iron Canyon II Soil Monitoring Soil Strength Before & After Harvest 10 Month Averages at 10-20 cm

  15. Iron Canyon II Soil Monitoring Pre- vs. Post-Harvest Disturbance Units- Feet (1,000 ft total in transects)

  16. Iron Canyon II Soil Monitoring Soil Strength Before & After Harvest 10 Month Averages at 10-20 cm

  17. Iron Canyon II Soil Monitoring Bulk Density Before & After Harvest Averages at 10-20 cm

  18. Iron Canyon II Soil Monitoring Bulk Density Before & After Harvest Averages at 10-20 cm 24% of Harvest Area

  19. Iron Canyon II Soil Monitoring Pre- vs. Post-Harvest Disturbance Units- Feet (1000 ft total in transects)

  20. Bulk Density, Post-Harvest (10-20cm) 1.20 1.00 0.80 BULK DENSITY (g/cm3) 0.60 0.40 0.20 0.00 POST undist dist skid undist dist skid undist dist skid PRE UNDISTURBED DISTURBED SKID Iron Canyon II Soil Monitoring Post-Harvest Disturbance

  21. Iron Canyon II Soil Monitoring Post-Harvest Disturbance

  22. Iron Canyon I Soil Monitoring Looking Back…. 2001 UNIT - HARVESTED IN MAY Averages by Disturbance Category (10-20 cm depth) Region 5 Standard: 10% Porosity Reduction Initial Db: 0.76 Threshold Db: 0.95

  23. Disturbance Basics • EXTENT • % area, depth • SEVERITY • undisturbed extreme • DISTRIBUTION • dispersed concentrated • DURATION • short term long term • mitigation? • natural recovery?

  24. UNDIST DIST SKID PRE POST

  25. Conclusions from Iron Canyon II Soil Monitoring Results • Meaningful disturbance classes can be established easily and objectively

  26. Conclusions from Iron Canyon II Soil Monitoring Results • Meaningful disturbance classes can be established easily and objectively • Pre-harvest stands came with legacy impacts that remained significant after decades

  27. Conclusions from Iron Canyon II Soil Monitoring Results • Meaningful disturbance classes can be established easily and objectively • Pre-harvest stands came with legacy impacts that remained significant after decades • Legacy impacts were compounded by recent thinning, creating cumulative impacts

  28. Conclusions from Iron Canyon II Soil Monitoring Results • Meaningful disturbance classes can be established easily and objectively • Pre-harvest stands came with legacy impacts that remained significant after decades • Legacy impacts were compounded by recent thinning, creating cumulative impacts • Assessing cumulative impacts requires pre-harvest monitoring

  29. Conclusions from Iron Canyon II Soil Monitoring Results • Cumulative impacts exceed thresholds on • some skid trails

  30. Conclusions from Iron Canyon II Soil Monitoring Results • Cumulative impacts exceed thresholds on • some skid trails • Old and new skid trails were coincidental at best.

  31. Conclusions from Iron Canyon II Soil Monitoring Results • Cumulative impacts exceed thresholds on • some skid trails • Old and new skid trails were coincidental at best • Mechanical operations on these soils will produce detrimental impacts

  32. Conclusions from Iron Canyon II Soil Monitoring Results • Cumulative impacts exceed thresholds on • some skid trails • Old and new skid trails were coincidental at best • Mechanical operations on these soils will produce detrimental impacts • The result is more areal impacts, adding to legacy disturbance for next harvest.

  33. National Forest Soil Scientists are Charged with Monitoring Monitoring need not be difficult or expensive. It’s less expensive than planning & lawsuits!

  34. THANKS TO: Dr. Robert Powers - PSW Brad Rust – Shasta-Trinity NF Scott Miles – R-5

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