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An evaluation of boundary-line release criteria for eleven North American tree species
 

Summary: 120
An evaluation of boundary-line release criteria for eleven North
American tree species
B.A. Black1
& M.D. Abrams2
1
Hatfield Marine Science Center, Newport, OR 97365, Email: Bryan.Black@oregonstate.edu
2
Corresponding author, 4 Ferguson Building, Penn State University, University Park, PA 16802
Email: agl@psu.edu
Introduction
One of the most fundamental dendroecological techniques for identifying disturbance events
in tree ring time series is the analysis of releases (Lorimer and Frelich 1989). Traditionally, a
release has been defined as an event where the percent growth change in radial growth
exceeds a given minimum threshold, such as 50 or 100 percent, which in some criteria must
be maintained for a certain length of time such as five or ten years (Lorimer and Frelich
1989, Nowacki and Abrams 1997). Thus, releases rely on the assumption that the magnitude
of percent-growth change corresponds to the magnitude of a canopy disturbance. However,
the relationship between percent-growth change and canopy disturbance is complicated by a
number of interrelated and confounding variables such as crown size and position; gap

  

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

 

Collections: Environmental Sciences and Ecology