Prey Meadows 1873 Prey Meadows 1993 Research Objectives Identify - - PowerPoint PPT Presentation

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Prey Meadows 1873 Prey Meadows 1993 Research Objectives Identify - - PowerPoint PPT Presentation

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Prey Meadows 1873 Prey Meadows 1993 Research Objectives Identify the Stand Characteristics of the Pre-Comstock forests Identify the Characteristics of Canopy and Surface Fuels and Potential Fire Behavior in Pre- Comstock Forests

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Prey Meadows 1873

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Prey Meadows 1993

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Research Objectives

 Identify the Stand Characteristics of

the Pre-Comstock forests

 Identify the Characteristics of

Canopy and Surface Fuels and Potential Fire Behavior in Pre- Comstock Forests

 How have Forest Conditions and

Potential Fire Behavior Changed since the Pre-Comstock Period

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Research Approach

 Dendroecology  Vegetation Simulation Models (FVS)  Surface and Crown Fire Simulation

Models (FMA)

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Mixed Conifer Forest – Stand Level Photo

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Forest Reconstruction

Vegetation mapping

Stand structure analysis

10 20 30 40 50 10 20 30 40 50 60 70 80 90 100 meters meters
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Pre-Euroamerican Fire History

Jeffrey pine forests, Lake Tahoe Basin

1400 1450 1500 1550 1600 1650 1700 1750 1800 1850 1900 1950 2000

Group A Group B Group C Group D Group E Group F Group G Group I Group J Group K Group L Group M

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Pre-Comstock Fire Return Intervals

Grand Mean Point Fire Return Interval

 Jeffrey Pine 15 years  Mixed Conifer 22 years  Red Fir 76 years  Lodgepole Pine 50 years

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Stand Density

JP MC RF LP

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Stand Basal Area

JP MC RF LP

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Jeffrey Pine Forest Size Structure

Pre-Comstock Contemporary

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Mixed Conifer Forest Structure

Pre-Comstock Contemporary

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Red Fir Forest Size Structure

Pre-Comstock Contemporary

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Lodgepole Pine Forest Structure

Pre-Comstock Contemporary

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FVS

Pre-Comstock Mixed Conifer Stand 90th Percentile Weather Conditions Contemporary Mixed Conifer Stand 90th Percentile Weather Conditions

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Potential Fire Behavior

98th Percentile Fire Weather Flame Length (m) Rate of Spread (km\hr)

200 400 600 800 1000 1200

Pre. Cont.

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Potential Fire Behavior

98th Percentile Fire Weather Torching Index Crowning Index

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Potential Fire Behavior

98th Percentile Fire Weather

Pre-Comstock Fire Type Contemporary Fire Type

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Density of Pre-Comstock Second Growth, and Thinned Stands

Jeffrey Pine Forests, Carson Range

50 100 150 200 250 300 350 400

PE SG T PE SG T PE SG T PE SG T PE SG T PE SG T

Jeffrey pine White Fir Red Fir SG = Second growth T = Thinned PE = Pre-Euroamerican

LH-1 LH-2 LH-3 WH-2 LH-4 WH-3 stems ac-1

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Basal Area of Pre-Comstock Second Growth, and Thinned Stands

Jeffrey Pine Forests, Carson Range

Jeffrey pine White Fir Red Fir SG = Second growth T = Thinned PE = Pre-Euroamerican 50 100 150 200 250 300

PE SG T PE SG T PE SG T PE SG T PE SG T PE SG T

LH-1 LH-2 LH-3 WH-2 LH-4 WH-3

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1939 Air Photo

Brushfield 1861 Fire High Severity Forest/Brush 1873 Fire Mixed Severity

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2000 Air Photo

Brushfield 1861 Fire High Severity Forest/Brush 1873 Fire Mixed Severity

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20th century landscape change

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Landscape scale

 Vegetation patterns related to differences

in fire severity

 Areas of high severity burns were present  Fire severity patterns related to topography

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Landscape scale dynamics

Repeat historical aerial photography

GIS and Image Analysis

Vegetation sampling and ground-truthing

Fire History Reconstruction

Landscape patterns and processes

Change detection 1939 1998 1939 1998 Fire Severity Patterns