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Dendroecology in young stands: case studies from jack pine in northern lower Michigan

Summary: Dendroecology in young stands: case studies
from jack pine in northern lower Michigan
Carolyn A. Copenheaver*
, Marc D. Abrams
203 Forest Resources Laboratory, School of Forest Resources, The Pennsylvania State University, University Park, PA 16802, USA
Received 28 September 2002; received in revised form 2 December 2002; accepted 12 January 2003
Eight jack pine (Pinus banksiana) stands in northern lower Michigan were sampled to evaluate the potential of dendroe-
cological methods for studying stand dynamics with young trees. At each stand, a minimum of 20 dominant and codominant
trees were cored, and at two stands additional recruitment data were collected. The cores were all cross-dated and measured. The
raw ring widths were used to identify growth suppressions and releases within the individual chronologies. Standardized master
chronologies were developed, and the residual master chronology from each stand was correlated with temperature and
precipitation to identify significant dendroclimatic relationships that may reduce the ecological signal in the tree-ring record.
There were no important dendroclimatic relationships at any of the eight stands; therefore, the tree-ring record was largely a
reflection of stand development. At all stands, suppression periods were more common than release events because all of the
stands were composed of open-grown jack pine that had initial high rates of growth. The jack pine plantations had synchronous
canopy closure (as evidenced by suppression), but the naturally regenerated stands had asynchronous canopy closure. Thus,
the master chronologies were useful for identifying common stand-level growth patterns within plantations, but the individual
tree chronologies were more useful within the naturally regenerated stands. One of the limitations of calculating suppression
events in young trees was that the first and last 10 years of the chronology were excluded because of the equations used to


Source: Abrams, Marc David - School of Forest Resources, Pennsylvania State University


Collections: Environmental Sciences and Ecology