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Using the Annual Tree Ring to Determine Tree Age

By , About.com Guide

5 of 5

Reading an Increment Borer Tree Core
Reading a Tree Ring Core

Reading a Tree Ring Core

Image by Steve Nix, Licensed to About.com
Extract a tree core by boring into the center of a tree with the appropriate sized increment borer. Slip the extractor fully through the core tube, break the core by turning the increment borer counterclockwise one-half turn and remove extractor with core.

You will then be able to see a core from the bark to the pith. You can count the age of the tree by counting each annual ring increment as one year. Note that one year includes both summer wood and spring wood.

In most cases spring wood is the rapid-growing lighter colored wood. Summer wood is the slower-growing dark colored wood. There can be false rings when temperature and weather changes stimulate small spurts or declines in growth.

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