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Alternatives for creating early seral forest openings Andrew Gray
What is an early seral forest? <ul><li>Early seral=Successional stage after disturbance and before tree canopy closure </l...
<ul><li>How much disturbance? </li></ul><ul><li>What needs to be disturbed? </li></ul><ul><li>How long will it remain open...
IT DEPENDS...
Important disturbance characteristics <ul><li>Disturbance size </li></ul><ul><li>Disturbance severity (residual structure ...
Experimental design
HJA old-growth Trout Ck. old-growth Panther Ck. mature Martha Ck. mature
Gap light and moisture patterns Light Soil moisture N
 
 
 
Fig. 4. Average differences in soil moisture between the clearcut and the forested areas during spring (April-June), summe...
Change in species richness by gap size
Changes in cover of residual and invader species Mean of summed cover by species group
Residual plants can take the heat
Density of natural regeneration after 3 growing seasons Hemlock in old-growth only. Density in mature stands=0.
Tree canopy closure was faster in old-growth stands
Where’d my early seral go?
Blue River Landscape Study: based on natural-disturbance regimes
Landscape area 1 (N. Fk. Quartz)
Forb species in BRLS study
Teakettle study: burn and/or thin? No thin CASPO thin Shelterwood No burn Burn
Understory response to thinning and burning No burn Burn
No burn Burn No burn Burn white fir incense-cedar Jeffrey pine sugar pine
 
Is NFMA a barrier to enhancing early-seral forest? &quot;... all forested lands in the National Forest System shall be mai...
Seral conditions on private lands
Conclusions <ul><li>Relatively small gaps or light thinnings in the overstory create local hot-spots of early seral plants...
 
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Andy Gray - Alternatives for creating early seral forest openings

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Andy Gray - Alternatives for creating early seral forest openings

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Transcript of "Andy Gray - Alternatives for creating early seral forest openings"

  1. 1. Alternatives for creating early seral forest openings Andrew Gray
  2. 2. What is an early seral forest? <ul><li>Early seral=Successional stage after disturbance and before tree canopy closure </li></ul><ul><li>Concept of succession developed from studies of abandoned fields and glacier retreat </li></ul><ul><li>But stand development rarely starts from “bare ground” </li></ul>
  3. 3. <ul><li>How much disturbance? </li></ul><ul><li>What needs to be disturbed? </li></ul><ul><li>How long will it remain open? </li></ul>
  4. 4. IT DEPENDS...
  5. 5. Important disturbance characteristics <ul><li>Disturbance size </li></ul><ul><li>Disturbance severity (residual structure and composition: over- and under-story) </li></ul><ul><li>Available resources: light, soil moisture, nutrients </li></ul><ul><li>Disturbance frequency </li></ul>
  6. 6. Experimental design
  7. 7. HJA old-growth Trout Ck. old-growth Panther Ck. mature Martha Ck. mature
  8. 8. Gap light and moisture patterns Light Soil moisture N
  9. 12. Fig. 4. Average differences in soil moisture between the clearcut and the forested areas during spring (April-June), summer (July-September), and fall (October-November), 1960-1980. Positive values indicate higher soil moisture in the clearcut area. Solid data points represent significant differences (t~ = 0.05, t-test of inequality) between the clearcut and forested areas. P.W. Adams et al. 1991. For. Ecol. Manage. 41: 249-263 Soil moisture is temporarily more abundant after clear-cutting
  10. 13. Change in species richness by gap size
  11. 14. Changes in cover of residual and invader species Mean of summed cover by species group
  12. 15. Residual plants can take the heat
  13. 16. Density of natural regeneration after 3 growing seasons Hemlock in old-growth only. Density in mature stands=0.
  14. 17. Tree canopy closure was faster in old-growth stands
  15. 18. Where’d my early seral go?
  16. 19. Blue River Landscape Study: based on natural-disturbance regimes
  17. 20. Landscape area 1 (N. Fk. Quartz)
  18. 21. Forb species in BRLS study
  19. 22. Teakettle study: burn and/or thin? No thin CASPO thin Shelterwood No burn Burn
  20. 23. Understory response to thinning and burning No burn Burn
  21. 24. No burn Burn No burn Burn white fir incense-cedar Jeffrey pine sugar pine
  22. 26. Is NFMA a barrier to enhancing early-seral forest? &quot;... all forested lands in the National Forest System shall be maintained in appropriate forest cover with species of trees, degree of stocking , rate of growth, and conditions of stand designed to secure the maximum benefits of multiple use sustained yield management in accordance with land management plans.”
  23. 27. Seral conditions on private lands
  24. 28. Conclusions <ul><li>Relatively small gaps or light thinnings in the overstory create local hot-spots of early seral plants, may be beneficial to many organisms. </li></ul><ul><li>Understory density and disturbance affects composition and the speed of crown closure. </li></ul><ul><li>Light prescriptions can be counterproductive; severe or repeated disturbances may be important for maintaining high-quality early seral conditions. </li></ul>
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