Red Pine Cambial Phenology in Northern Minnesota: complimentary approaches to determining phenology of radial growth

Authors: Emily Nagel*, University of Minnesota - Minneapolis, Kurt Kipfmueller, University of Minnesota Department of Geography, Environment, & Society, Daniel Griffin, University of Minnesota Department of Geography, Environment, & Society
Topics: Environmental Science
Keywords: dendrochronology
Session Type: Poster
Day: 4/11/2018
Start / End Time: 8:00 AM / 9:40 AM
Room: Napoleon Foyer/Common St. Corridor, Sheraton, 3rd Floor
Presentation File: No File Uploaded


Forests respond to seasonal environmental variability. The question of red pine’s seasonality of radial growth is one that, when answered, offers knowledge of the timing of intra-annual events shown in a single ring of growth. This research explores the timing of dormancy, cambial expansion, beginning of earlywood formation, transition to latewood formation, and termination of annual growth. In this survey of red pines’ radial growth timing, two approaches were used. The first approach included an examination of the last year of growth of 662 red pines from 31 sites within the border lakes region of northern Minnesota that span from the growing seasons of 2005 to 2015. The second approach examined growth from four trees at the University of Minnesota’s Cloquet Forestry Center over the course of 2017’s growing season, examining changes in cambial activity on a weekly basis. The combination of these two approaches offers an initial glimpse into the phenology of radial growth in red pines through northern Minnesota. With added insight on the timing of annual wood formation, a more precise estimate of the phenology disturbance regimes, such as fire-scar seasonality can be tentatively made based on a scar’s location within a ring.

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