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Changes in fire regime, forest structure, and tree spatial patterns in ponderosa pine forests of the northern Colorado Front Range, 1860 to 2012
Peter M. Brown 1,4
Chad Julian 2
Laurie Huckaby 3
Paula Fornwalt 3
Michael Battaglia 3
Antony S. Cheng 4
1 Rocky Mountain Tree-Ring Research, Ft. Collins CO2 Boulder County Parks and Open Space, Boulder CO3 Rocky Mountain Research Station, Ft. Collins CO 4 Colorado Forest Restoration Institute, Ft. Collins CO
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Buffalo Creek (1996)Hi Meadow (2000)
Hayman (2002)
Black Tiger (1989)
Bobcat Gulch (2000)
Big Elk (2002)
Overland (2003)Four Mile (2010)
High Park (2012)Picnic Rock (2004)
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Front Range Forest Reconstruction Network*
2012 Field Season:13 Landscape Units73 0.5 ha plots (3 to 7 plots in each unit)
Funded by:Colorado Forest Restoration InstituteArapahoe-Roosevelt National ForestPike-San Isabel National ForestRocky Mountain Research StationBoulder County Parks and Open SpaceRocky Mountain Tree-Ring Research
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FRFRNet Methods:1. Stem map pre-settlement trees within 0.5 ha plots; -2. Subsample age structure and post-settlement structure in 4 500 m2 subplots; 3. Collect all fire-scar evidence in plot and surrounding area.
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Lyons
Boulder County Parks and Open Space Hall Ranch
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Site MFI (Std dev)11 MeFI22 WMPI33 WMode44 Range
Hall Ranch 14 (9) 12 12 9 3 to 36
Heil Valley Ranch 9 (6) 7 8 6 3 to 23
Combined either 8 (6) 4 7 4 2 to 20
1 Mean fire interval2 Median fire interval 3 Weibull distribution median probability interval (Grissino-Mayer 2001)4 Weibull distribution modal interval
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http://photosynth.net/view.aspx?cid=b5b79dde-55e2-4d01-9d3e-2ae09cd74a6f
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HA01 HA05 HA16 HA17 HA18 HA24 HE06 HE13 HE180
20
40
60
80
100
120
140Tr
ees
ac-1
Current Historical
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Red line = DBH
Terrestrial LIDAR scan profile forHeil Ranch plot 13
Data from Jason M. StokerUSGS Earth Resources Observation and Science (EROS)
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Measured DBH to TLS estimated DBH: HE13
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A B C D E F0
20
40
60
A
B
C
D
E
F
Current Conditions
Fuels Treatment
Restoration
A B C D E F0
20406080
A B C D E F0
20
40
60
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For more information: Peter Brown, [email protected]
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DBH
(cm
)
DBH
(cm
)
“Old”
“Transitional”
“Young”
“Pre-settlement” (ca 1880) living trees, defined as ≥ 25 cm dbh OR by morphology
“Post-settlement” living trees, defined as < 25 cm dbh OR by morphology
Pre- Post-