Changes in Fire Regimes and the Successional Status of Table Mountain Pine in the Southern Appalachians - PowerPoint PPT Presentation

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Changes in Fire Regimes and the Successional Status of Table Mountain Pine in the Southern Appalachians

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Title: Changes in Fire Regimes and the Successional Status of Table Mountain Pine in the Southern Appalachians


1
Changes in Fire Regimes and the Successional
Status of Table Mountain Pine in the Southern
Appalachians
Henri D. Grissino-Mayer Michael R.
Armbrister Laboratory of Tree-Ring
Science Department of Geography University of
Tennessee Knoxville, Tennessee 37996
2
Problem Statement
  • Table Mountain pine endemic to Appalachians
  • Fire-dependent species cone serotiny, site
    prep
  • Considerable human alterations to native
    communities
  • Primary among these is 20th century fire
    exclusion new fire regime
  • Effects on this species are a major concern
    for management agencies
  • Information needed on site-specific fire
    history
  • Retrospective study provides needed reference
    conditions

3
Objectives
  • Evaluate current age structure of select TMP
    stands
  • Identify and characterize historical fire
    regimes in these stands
  • Combine this information to assess its current
    successional status

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5
Field Methods
  • Age structure analysis
  • Cored minimum 75 trees at 5 sites, 2 cores per
    tree
  • Aged seedlings and saplings via bud scars,
    branch nodes

2. Fire-scar analysis Located suitable
fire-scarred logs and snags Collected small
wedges from selected living trees All sections
collected via hand saws
6
Laboratory Methods
  • Age structure analysis
  • Mounted, sanded, dated all tree rings on all
    cores
  • Developed histograms that depicted the age
    structure of all 5 stands

2. Fire-scar analysis Sanded, dated all tree
rings on all sections Dated all embedded fire
scars to year of formation Developed graphs
depicting fire occurrence over time
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12
Stagnation!
13
Undated samples were very useful!
14
Mean Fire Interval 8 yrs Median Fire
Interval 6 Weibull Modal Interval
(MOI) 5 Weibull Median Interval (MEI) 7 Lower
Exceedance Interval (LEI) 3 Upper Exceedance
Interval (UEI) 13 Maximum Hazard
Interval (MHI) 81
Preliminary statistics on fire history in TMP
stands of the Great Smoky Mountains National Park
15
Major Conclusions
  1. Living TMP crossdate very well great potential.
  2. Older dead and downed more difficult.
  3. Age structure shows peaks in 60-69 and 70-79
    classes.
  4. Little to no regeneration is occurring in these
    stands.
  5. Fire history information can be obtained even on
    undated samples.
  6. Fires occurred ca. every 6-7 years in pre-park
    era.
  7. Maximum Hazard Interval indicates conditions in
    these park stands are strongly conducive to
    burning.

16
Acknowledgements
Thank you JFSP! GSMNP, NPS, Mike Jenkins TVA,
Charles Smart Committee members Ken Orvis, Sally
Horn Laboratory of Tree-Ring Science Department
of Geography, University of Tennessee Field and
lab help from Daniel Lewis, David Mann, Jake
Cseke, Beth Atchley, Damian Kolbay, Bill Dennis,
Brian Reed
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