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Ecological Applications, 13(6), 2003, pp. 17331749 2003 by the Ecological Society of America
 

Summary: 1733
Ecological Applications, 13(6), 2003, pp. 17331749
2003 by the Ecological Society of America
USE OF BOUNDARY-LINE GROWTH PATTERNS AS A BASIS FOR
DENDROECOLOGICAL RELEASE CRITERIA
BRYAN A. BLACK1
AND MARC D. ABRAMS
203 Forest Resources Lab, Penn State University, University Park, Pennsylvania 16802 USA
Abstract. Identifying releases from suppression represents one of the most fundamental
dendroecological procedures for quantifying forest disturbance histories. In tree-ring series,
releases are typically defined as pulses in percent growth change that exceed a minimum
threshold. Past methodologies have applied fixed growth-change thresholds that may overly
generalize the ability of a tree to respond to a disturbance event. In this study, we develop
a more precise method that scales each release by its maximum release potential as defined
by prior growth rates, using an old growth hemlock (Tsuga canadensis L.) forest in central
Pennsylvania as an example. On average, tree age, diameter, and crown class appear to
influence the magnitude of release response. However, differences in release response be-
tween age, diameter, and crown classes are largely an artifact of the more fundamental
relationship between release response and growth immediately prior to release. Specifically,
maximum percent growth change declines at a steep, negative exponential rate as prior

  

Source: Abrams, Marc David - School of Forest Resources, Pennsylvania State University
Black, Bryan.- Hatfield Marine Science Center, Oregon State University

 

Collections: Environmental Sciences and Ecology