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Fire History of Jeffery Pine ( Pinus jeffreyi ), Inyo National Forest, California

Fire History of Jeffery Pine ( Pinus jeffreyi ), Inyo National Forest, California. NADEF 2010 FIRE HISTORY GROUP Group Leaders: Peter Brown 1 , Christopher Gentry 2

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Fire History of Jeffery Pine ( Pinus jeffreyi ), Inyo National Forest, California

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  1. Fire History of Jeffery Pine (Pinusjeffreyi), Inyo National Forest, California NADEF 2010 FIRE HISTORY GROUP Group Leaders: Peter Brown1, Christopher Gentry2 Group Members: Brooke Cassell3, Alexa Dugan4, Jeff Harris5, Chad King6, Joseph Marschall6, Diego Perez Salicrup7, Gus Smith8, John Waldron9 1Rocky Mountain Tree Ring Research, Fort Collins, CO, 2Austin Peay State University, 3University of Washington, 4University of Wyoming, 5Southern Illinois University, 6University of Missouri, 7Universidad NacionalAutonoma de Mexico, 8Yosemite National Park, 9University of West Florida

  2. Objectives • Document the fire and recruitment history of Jeffrey pine (Pinusjeffreyi) in the project area • Explore the factors that have influenced fire and forest dynamics in the project area

  3. Study Site • Inyo National Forest on western edge of Inyo-White Range • Elevation: ~ 2300 m • Previously inhabited by Mono Indians • Stand composition: Jeffrey pine and white fir

  4. Pinusjeffreyi • Ranges from Northern Mexico to Southern Oregon • Adapted to minimize fire damage: • thick bark • protected terminal buds • self-pruning branches • open crowns • high moisture content of needles

  5. Methods: Field • Six plots selected at 50 m intervals • Surveyed closest 10 trees > 20 cm dbh • Cored at 30 cm above ground • The 5th and 10th trees also cored at breast height • Recorded both dbh and dsh • 22 fire-scarred trees collected

  6. cv cv Fire-Scarred Samples

  7. Methods: Laboratory • Prepared cores and cross-sections • Mounted cores • Glued separated fire-scarred samples • Sanded using progressively finer grit sand paper • Clearly definable cellular features

  8. Methods: Laboratory • Crossdated each tree-ring series • Skeleton plot • List method • Identified fire-scars • Healing patterns • Charring at point of injury • FHX2 (Grissino-Mayer, 2001) used to analyze fire history • Seasonality • Fire return intervals • Superposed Epoch Analysis • Palmer Drought Severity Index (PDSI) 1729

  9. Results: Recruitment

  10. Results: Recruitment & DBH relationship

  11. Results: Fire-scar dates

  12. Results: FHX2 Statistics

  13. Results: Superposed Epoch Analysis ± 95% C.I.

  14. Results:

  15. Discussion/Conclusions • 173 year gap in recruitment • Mean fire return interval of 7-9 years (range 3-25 years) • Fire Regime • Lack of correspondence between fire history and climate index (PDSI).

  16. Discussion/Conclusions Wildfires, complexity, and highly optimized toleranceMax A. Moritz, Marco E. Morais, Lora A. Summerell, J. M. Carlson, and John Doyle (2005) Proceedings of the National Academy of Sciences 102:17912–17917

  17. Acknowledgements • We would like to thank: • Jim Speer, PhD (Indiana State University) • National Science Foundation (NSF) • White Mountain Research Station • Tim Fersell and Shadow Ayala • and most of all… Sumo

  18. Questions? This skeleton plot is for the birds… Speaking of birds, when’s dinner? Sumo – The Official Fire History Group Mascot!

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