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Early Seral Ecosystem Creation And Dynamics

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Early Seral Ecosystem Creation And Dynamics

Tecnologia
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Early Seral Ecosystem Creation and Dynamics Thomas Spies PNW Research Station
Topics ,[object Object],[object Object],[object Object],[object Object]
 
His ES High Severity Fire Mixed-Severity Fire
A Definition ,[object Object],[object Object],[object Object],[object Object],[object Object]
Components of Early Seral ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Disturbances that create early seral ecosystems vary in their effects on ecosystem structure Structural Element Wind Fire Landslide Clear cut/Burn Canopy foliage X X X X Standing Trees X x X X LWD X X/ x Understory vegetation X X X Forest Floor X X X OM Soil x X x Roots x
0 20 Low Mod High Tree Canopy Closure (%) Dead and Live Biological Legacies Wildfire Windthrow Landslide Early Seral Based on What Remains Retention Systems
Blowdown, Bull Run Watershed
HOH Fire Tillamook Fire High Severity Wildfire Yacolt Burn
Landslides in Coast Range Photo by Rob Pabst
Long-lived early seral related to land-use history and site conditions
Early Seral on Intensively Managed Forest Land
Gap Disturbances
Gap Height Diameter/Ht Ratio = 1.0 Diameter/Ht Ratio = 0.5 Gap Size Effect Dense Conifer Forests ES plant species begin to appear ES plant species infrequent
Gap diameter/canopy ht ratio Number of Gaps Most natural gaps are too small for early successional conditions
Fire as a gap process in dry, fire-prone forests
Historical dynamics of fire and succession in Ponderosa Pine R. Van Pelt Time Zero 20 yrs 40 yrs 60 yrs 80 yrs Fire Suppression
ES ES ES ESES Successional Pathways ES
ES ES ES
Early seral creation in the Biscuit Fire
Biscuit Fire Crown Damage by Vegetation Cover Class ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Thompson and Spies In Press (ES)
Historical Range of Variability Oregon Coast Range % of Landscape Early Seral: 10-25% Old Growth: 35-60% % of Landscape Probability
Wildfire Conversion of Old Forest to Early Successional 1993-2003 Percent Loss of Older Forest on a Decadal Basis By Province Based on Moeur and Spies et al. 2005 3.1 % ( incl BB and DL) 3.6 % 3 % 9.5 % 2.3 % 0.4 % 0 % 0 % 0 % 1.4 % 0 %
 
Conclusions ,[object Object],[object Object],[object Object]
Conclusions ,[object Object],[object Object],[object Object]
Conclusions ,[object Object],[object Object],[object Object]
 

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Early Seral Ecosystem Creation And Dynamics

  • 1. Early Seral Ecosystem Creation and Dynamics Thomas Spies PNW Research Station
  • 2.
  • 3.  
  • 4. His ES High Severity Fire Mixed-Severity Fire
  • 5.
  • 6.
  • 7. Disturbances that create early seral ecosystems vary in their effects on ecosystem structure Structural Element Wind Fire Landslide Clear cut/Burn Canopy foliage X X X X Standing Trees X x X X LWD X X/ x Understory vegetation X X X Forest Floor X X X OM Soil x X x Roots x
  • 8. 0 20 Low Mod High Tree Canopy Closure (%) Dead and Live Biological Legacies Wildfire Windthrow Landslide Early Seral Based on What Remains Retention Systems
  • 9. Blowdown, Bull Run Watershed
  • 10. HOH Fire Tillamook Fire High Severity Wildfire Yacolt Burn
  • 11. Landslides in Coast Range Photo by Rob Pabst
  • 12. Long-lived early seral related to land-use history and site conditions
  • 13. Early Seral on Intensively Managed Forest Land
  • 15. Gap Height Diameter/Ht Ratio = 1.0 Diameter/Ht Ratio = 0.5 Gap Size Effect Dense Conifer Forests ES plant species begin to appear ES plant species infrequent
  • 16. Gap diameter/canopy ht ratio Number of Gaps Most natural gaps are too small for early successional conditions
  • 17. Fire as a gap process in dry, fire-prone forests
  • 18. Historical dynamics of fire and succession in Ponderosa Pine R. Van Pelt Time Zero 20 yrs 40 yrs 60 yrs 80 yrs Fire Suppression
  • 19. ES ES ES ESES Successional Pathways ES
  • 21. Early seral creation in the Biscuit Fire
  • 22.
  • 23. Historical Range of Variability Oregon Coast Range % of Landscape Early Seral: 10-25% Old Growth: 35-60% % of Landscape Probability
  • 24. Wildfire Conversion of Old Forest to Early Successional 1993-2003 Percent Loss of Older Forest on a Decadal Basis By Province Based on Moeur and Spies et al. 2005 3.1 % ( incl BB and DL) 3.6 % 3 % 9.5 % 2.3 % 0.4 % 0 % 0 % 0 % 1.4 % 0 %
  • 25.  
  • 26.
  • 27.
  • 28.
  • 29.