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The Effect of Large Fire on Aspen Recruitment
Trent WildeUtah State University Extension
2014 Utah Section Society for Range ManagementFall Meeting
November 6, 2014Logan, Utah
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Monroe Mountain Working Group
Operating Hypothesis:
“Large disturbances in seral aspen, repeated over multiple years, can overwhelm herbivory and allow stems to successfully recruit”
• How large is large enough?
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Oldroyd Fire
• Monroe Mountain in South Central Utah• Burned in the summer of 2000• 1329 GIS Acres• Clone extinction
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Aspen are Important
Oldroyd Fire AreaMonroe MountainPre-Fire mid 1990’s
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Aspen are Important
Oldroyd Fire AreaMonroe Mountain
2011
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1996 Pole Creek Fire
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Pole Creek Fire
• Burned in the summer of 1996• South Central Utah• 20 miles west of Oldroyd Fire• 7113 GIS Acres
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Methodology
• Working at the landscape scale• Documenting on the “patch” or “stand”
level• Correlates with work from Rocky Mountain
Research Station and Colorado Forest Restoration Institute.
• http://www.fs.fed.us/rm/pubs/rmrs_gtr310.html
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GPS Aspen Patches
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Aspen are ImportantLegend
NonAspenConiferVegetationPreFire1993
NotBurned
AspenRecruitment
NoAspenRecruitment
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Aspen are ImportantLegend
NonAspenConiferVegetationPreFire1993
NotBurned
AspenRecruitment
NoAspenRecruitment
NonAspenConiferVegetationPreFire1993
• Pre-Fire vegetation types other than aspen and conifer as identified through aerial photos from 1993 (black and white)
• Total acreage = 2,708 acres
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Aspen are ImportantLegend
NonAspenConiferVegetationPreFire1993
NotBurned
AspenRecruitment
NoAspenRecruitment
Definitions:
NotBurned
• Areas within USFS 1996 Pole Creek Fire Boundary which were not burned during fire as identified through aerial photos post-fire
• Total acreage = 1,354 acres
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Aspen are ImportantLegend
NonAspenConiferVegetationPreFire1993
NotBurned
AspenRecruitment
NoAspenRecruitment
Definitions:
AspenRecruitment
• Stands of recruited aspen identified on the ground and plotted using handheld GPS (Trimble GeoXT 6000 with Floodlight tech.)
• Total acreage = 2,164 acres
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Aspen are ImportantLegend
NonAspenConiferVegetationPreFire1993
NotBurned
AspenRecruitment
NoAspenRecruitment
Definitions:
NoAspenRecruitment
• Areas identified as aspen or conifer pre-fire, but where there is no aspen recruitment in 2013
• Total acreage = 887 acres
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Aspen are ImportantLegend
NonAspenConiferVegetationPreFire1993
NotBurned
AspenRecruitment
NoAspenRecruitment
NoAspenRecruitment 887AspenRecruitment 2,164Potential Recruitment 3,051 acres
Aspen Recruitment 2,164 = 0.709 or 71%Potential Recruitment 3,051 Recruitment
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Aspen are Important
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Aspen are Important
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Aspen are Important
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Aspen are Important
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Conclusions
1996 Pole Creek Fire (7113 GIS acres)
• 71% of potential aspen recruitment acres have aspen recruitment in 2013
• A significant correlation between fire size and percentage of aspen recruitment
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Discussion…
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Discussion…
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Discussion…
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Discussion…
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Discussion…