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Beth A. Newingham1, Andrew T. Hudak2, April G. Smith1,
Benjamin C. Bright2 and Azad Henareh Khalyani3
1USDA Agricultural Research Service, Reno, NV2USFS Rocky Mountain Research Station, Moscow, ID3Colorado State University, Fort Collins, CO
Functional group responses to burn
severity in three ponderosa pine
ecosystems a decade after fire
International Fire Ecology and Management Congress
Orlando, FL 2017
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Hypothetical Responses
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15 Fires
Credit: Rob CoxUSDA-NRCS
Vegetation Types1. Subarctic Boreal
Spruce2. Moist Mixed
Conifer3. Dry Mixed Conifer4. Ponderosa Pine5. Mixed Chaparral
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Ponderosa Pine Range
www.prism.oregonstate.edu
**
*
Egley Jasper
Hayman
Shinneman et al. 2016 PLOS One
*
*
*Egley
Jasper
Hayman
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Research Questions
Understory Responses
1. Are there effects of burn severity on
plant communities a decade after fire?
2. Does post-fire recovery differ among
ponderosa pine communities?
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Research Sites
OR
SD
CO
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Ponderosa Pine Sites
Egley,
OR
Hayman,
CO
Jasper,
SD
Year Burned 2007 2002 2000
Year Resampled 2016 2015 2015
Years Post-fire 9 13 15
Mean Elevation (m) 1587 1825 1739
Mean Annual Temp (°C) 5.7 5.3 5.4
Mean Annual Precip (mm) 320 421 563
Fire Characteristics
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Ponderosa Pine SitesBurn Severity
Egley, OR Hayman, CO Jasper, SD
MTBS = Monitoring Trends in Burn SeveritydNBR = differenced Normalized Burn Ratio
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Experimental Design
Site Stratification1. Burn severity (dNBR)
– Ranged 6 to 925
2. Elevation– Ranged 1507-2859m
3. Aspect – TRASP (Transformed
Aspect)
SamplingFive plots per site
30m1m2
Visually estimated cover
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Analysis
Multivariate
Non-metric
multidimensional
scaling (NMS)
ordination– dNBR
– Plant cover
– Climate
Axis 1 (Variance 32.8%)
Axi
s 1
(V
aria
nce
22
.5%
)
Fire
EgleyHaymanJasper
Fire
EgleyHaymanJasper
Fire
EgleyHaymanJasper
Growing season MAP after
MAP before
Growing season MAP beforeMAP after
Tmin before
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Analysis
Univariate
Multiple linear regression
Response variables:
- Cover (%)
- Annual & perennial
- Native & introduced
- Graminoid, forb, shrub
- Total
- Species
- Shannon’s Diversity (H’)
Explanatory variables:
- dNBR
- Mean annual
precipitation after fire
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Results - CoverFunctional Group
Results
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Mixed Chaparral CoverBurn Severity Effects
** P< 0.05; *P< 0.10
* **
** *
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Mixed Chaparral CoverBurn Severity Effects
** P< 0.05; *P< 0.10
** ***
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Mixed Chaparral CoverPrecipitation Effects
** P< 0.05; *P< 0.10
**
** * *
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Mixed Chaparral CoverPrecipitation Effects
**
** P< 0.05; *P< 0.10
**
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Results – Species RichnessGrowth Form and Species Results
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Mixed Chaparral CoverNative vs. Introduced Cover
******
** P< 0.05; *P< 0.10
Burn severity did not affect shrub cover
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Mixed Chaparral CoverNative Species Cover
**
** P< 0.05; *P< 0.10
**
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Mixed Chaparral CoverIntroduced Species Cover
**
** P< 0.05; *P< 0.10
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Summary
A decade
after fire…
Egley,
OR
Hayman,
CO
Jasper,
SD
Cover Annual dNBR + . .
Perennial dNBR + . Precip
+
Native dNBR + . Precip
+
Introduced dNBR + Precip Precip
+
TOTAL dNBR + . Precip
+
Diversity Shannon’s . dNBR + Precip
+
Cover Native Grass . . .
Introduced
Grass
dNBR + Precip .
Native Forb dNBR + dNBR + Precip
Summary
Hayman Peak
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Conclusion
Understory Responses
1. Are there effects of burn severity on plant
communities a decade after fire?
• Yes, burn severity increased cover and diversity.
2. Does post-fire recovery differ among ponderosa
pine forests?
• Yes, burn severity effects most prevalent at the
drier ponderosa pine forests that are 9-12 years
post-fire.
Conclusions
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Recovery Trajectories
Ponderosa PineDriest
Wettest
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Questions?
Hellstrom; BLM
www.frames.gov/partner-sites/long-term-recoveryFunded by Joint Fire Science Program
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Hayman
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Jasper
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Egley
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Mixed Chaparral CoverElevation Effects
** **
** P< 0.05; *P< 0.10