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US Forest Service Research & Development
Contact Information
  • US Forest Service Research & Development
  • 1400 Independence Ave., SW
  • Washington, D.C. 20250-0003
  • 800-832-1355
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Research Highlights

Individual Highlight

Improving the Accuracy of Tree Ring Age Measurements

Snapshot : NRS Scientist Shawn Fraver developed regression models to estimate tree age adjustments needed, depending on coring height and growth rate.

Principal Investigators(s) :
Fraver, Shawn 
Research Location : nationwide
Research Station : Northern Research Station (NRS)
Year : 2010
Highlight ID : 221

Summary

Accurate tree ages are critical to forestry and ecological research as well as for management planning. However, ring counts from increment cores, if not corrected for the years between the root collar and coring height, can produce sizeable age errors. Incorrect age estimates are especially problematic in studies where tree establishment dates are used to date past disturbances. NRS Scientist Shawn Fraver developed regression models to estimate age adjustments needed, depending on coring height and growth rate. Applying the best-fit equations clearly improved age estimates, and these equations can now be used to adjust ages of mature trees occurring in these same settings.

Research Topics

Priority Areas

  • Inventory and Monitoring
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