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Fire Regimes and Forest History in Oregons Dry Forests Climate Fire - - PowerPoint PPT Presentation
Fire Regimes and Forest History in Oregons Dry Forests Climate Fire - - PowerPoint PPT Presentation
Fire Regimes and Forest History in Oregons Dry Forests Climate Fire Insects and Disease Andrew Merschel, Oregon State University Reconstructing Historical Fire Regimes Reconstructing Forest History Fire Tree Establishment Land Use
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Tree Establishment Fire
Reconstructing Forest History
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Land Use Changes in Mixed-Conifer Forests (Early 1900s)
This image cannot currently be displayed.Powell 2011
Selective Logging of Large Fire-Resistant Trees Heavy Grazing Fire Exclusion and Suppression
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Dry Forest Tree Ring Fire and Forest Histories 2008
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Dry Forest Tree Ring Fire and Forest Histories 2018
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What was the historical structure, composition, and development history of Oregon’s Dry Forests?
Persistent Ponderosa Pine
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Recent Douglas-fir
This image cannot currently be displayed.What was the historical structure, composition, and development history of Oregon’s Dry Forests?
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Recent Grand Fir
This image cannot currently be displayed.What was the historical structure, composition, and development history of Oregon’s Dry Forests?
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Persistent Shade Tolerant
What was the historical structure, composition, and development history of Oregon’s Dry Forests?
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Variable Response to Land Use Change
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Average Maximum Temperature Precipitation and Elevation Persistent Ponderosa Pine Recent Grand Fir
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a r R a d i a t i
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Recent Douglas-fir Persistent Shade Tolerant
Response to Land Use Change Varies with Environment
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Landscape Fire Reconstruction Across Forest Types
20 45 0.5 1 Annual August Precipitation (in)
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Historical Fire Size and Frequency
Fire Rotation 19 years
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n = 13 n = 17 n = 22 n = 17 n = 13
10 15 20 25 30 Persistent Ponderosa Pine Persistent Ponderosa with Lodgepole Recent Grand Fir Persistent Shade Tolerant Persisten Shade Tolerant with Lodgepol
Interval (years)
Variation in Frequency Among Forest Types
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Historical fire kept density low across a broad range of forest
- types. In the absence of fire, there has been far greater change in
moister and more productive settings. Historically, fire occurred far more frequently and fire perimeters were much larger. Low severity surface fire was the dominant fire effect in very different forest types from ponderosa pine to mixed-conifer. Infrequent, high severity fire occurred, but it was quite limited in spatial extent.
Take Home Messages
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Variable Response to Land Use Change
Fire Exclusion
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The Study of Tree Rings (Dendrochronology)
Climate Fire Insects and Disease
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Ponderosa Pine Recent Douglas-fir Recent Grand Fir Persistent Shade Tolerant
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