Data from: Accuracy of node and bud-scar counts for aging two dominant conifers in western North America

Accurately aging trees is critical for understanding tree demography and
tree responses to environmental change. Given the proliferation of studies
aimed at understanding the effects of climate and disturbance on forest
ecosystems, it is important to understand the tradeoffs between
field-based age estimates and precise dendrochronological techniques. We
assessed the accuracy of age estimates from node counts in the field
against precise tree-ring counts at the root-shoot boundary, in 1279
ponderosa pine and 1268 Douglas-fir seedlings sampled from across three
study regions in the western U.S. We also assessed the accuracy of age
estimates from bud-scar counts in the field against node counts and
precise tree-ring counts in a subset of 757 seedlings from the Northern
Rockies. Node counts systematically underestimated ring counts by an
average of 4.1 years, with bias increasing with tree age. At annual, ±1-,
±2-, and ±5-yr precision, the accuracy of node counts was 5%, 15%, 29%,
and 74% across all regions and species, respectively. Similar results were
found for bud scars. Given the magnitude of the bias between field-based
methods and ring counts, it is critical to select appropriate aging
methods, based on the precision required to answer specific ecological
questions. To improve the accuracy of field-based age estimates in these
species, we provide a tool for correcting for the bias when precise
dendrochronological aging is not feasible.