You are here: Home
/ Publication Information
Title: Improving tree age estimates derived from increment cores: a case study of red pine
Author: Fraver, Shawn; Bradford, John B.; Palik, Brian J.
Source: Forest Science. 57(2): 164-170.
Description: Accurate tree ages are critical to a range of forestry and ecological studies. However, ring counts from increment cores, if not corrected for the years between the root collar and coring height, can produce sizeable age errors. The magnitude of errors is influenced by both the height at which the core is extracted and the growth rate. We destructively sampled saplings and small trees of red pine (Pinus resinosa Ait.) and combined within- and between-tree cross-dating to determine accurate rings counts and radial growth rates for 11 stem sections of each sample. We developed regression models to estimate age adjustment as a function of coring height and radial growth rate. We compared candidate models using corrected Akaike's information criterion scores, and we evaluated model performance by jackknife permutations. Application of our best-fit equations clearly improved age estimates: compared with unadjusted ring counts, our adjusted age estimates had normally distributed errors centered near 0, lower standard deviations, and a narrower range of values. Thus, these equations can be used to adjust ages of cored, mature trees occurring in these same settings. The methods used here may be applied to other shade-intolerant or mid-tolerant species where improved tree establishment dates are needed.
Keywords: cross-dating, dendrochronology, Pinus resinosa, stand dynamics, tree age
View or Print this Publication (225 KB)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
- This publication may be available in hard copy. Check the Northern Research Station web site to request a printed copy of this publication.
- Our on-line publications are scanned and captured using Adobe Acrobat. During the capture process some typographical errors may occur. Please contact Sharon Hobrla, firstname.lastname@example.org if you notice any errors which make this publication unusable.
Fraver, Shawn; Bradford, John B.; Palik, Brian J. 2011. Improving tree age estimates derived from increment cores: a case study of red pine. Forest Science. 57(2): 164-170.
Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility