Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Cell trait timings across the tree rings of black spruce collected from five sites distributed along a latitudinal gradient through the closed boreal forest of Quebec, Canada. Timings represent the day (DOY) at which a certain percentile of the tree ring was enlarging (light grey) or forming secondary walls (dark grey). The dashed line marks the percentage of latewood at each site.
