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Our Humble Introduction to Dendrochronology

Our Humble Introduction to Dendrochronology. Allison Hoff, Chris Roddick , Melanie Stine Team leader: Linah Ababneh 2010 Dendroecological Fieldweek Crooked Creek, White Mountains Research Station 12 August 2010. Objective. Training on the principles of dendrochronology , including:

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Our Humble Introduction to Dendrochronology

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  1. Our Humble Introduction to Dendrochronology Allison Hoff, Chris Roddick, Melanie Stine Team leader: LinahAbabneh 2010 DendroecologicalFieldweek Crooked Creek, White Mountains Research Station 12 August 2010

  2. Objective Training on the principles of dendrochronology, including: • Developing a question • Site selection • The principle of crossdating • Developing a master chronology

  3. Wood Anatomy Stokes and Smiley 1996

  4. Fritts 1976

  5. Principles and Limiting Factors Stokes and Smiley 1996

  6. Tree Ring Growth Model Rt = f(Gt, Ct, D1t, D2t, Et) • Gt = Age-related growth trend • Ct = Climate-related growth • D1t = Disturbance-related growth due to local factors within the stand (i.e. insect outbreaks) • D2t = Disturbance-related growth due to regional factors outside the stand (i.e. fires, floods, erosion, volcanoes) • Et = "Error" Variations due to factors other than Gt, Ct, D1t, D2t

  7. Crossdating Stokes and Smiley 1996

  8. Steps to Creating a Master Chronology • Site selection • Field sampling • Sample preparation • Crossdating • Skeleton plotting • Internal verification • Creating a master chronology

  9. Demonstrating Proper Field Attire

  10. Methods: Core Collection

  11. Methods: Other Field Data Collection

  12. Methods: Core Preparation - Mounting

  13. Methods: Core Preparation - Sanding Sandpaper • 120– 600 grit • 30 micro-finishing paper

  14. Methods: Creating Skeleton Plot

  15. Methods: Internal Verification

  16. Methods: Creating a Master Chronology

  17. Study Site

  18. Pinusjeffreyi(Jeffrey pine)

  19. Size to Age Comparison

  20. P. jeffreyiMarker Years 1948, 1960, 1977, 2001, 2007

  21. Short vs. Long Chronologies

  22. Lessons Learned... • Labeling is important • Don’t be drugged or hung-over • Matching site selection to question • Detailed field notes • Replication and verification • Always clean increment bores quickly

  23. Acknowledgements: NSF, Jim Speer, Henri Grissino-Mayer, LinahAbabneh, Peter Brown, Chris Gentry, Group leaders, Tim Forsell, Shadow, Adelia Barber, WMRS Conclusions

  24. Thank you.Questions?

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