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Identifying growth releases in dendrochronological studies of forest disturbance
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
2005 (English)In: Canadian Journal of Forest Research, ISSN 0045-5067, E-ISSN 1208-6037, Vol. 35, no 7, p. 1648-1656Article in journal (Refereed) Published
Abstract [en]

Information on historical disturbances is vital to our understanding of current forest conditions. Dendro chronological methods provide one means of reconstructing disturbance histories in temperate and boreal forests. In particular, the dates of significant growth releases recorded on surviving trees provide strong inferential evidence of past disturbance events. The most common method of detecting releases (the percent-increase method) expresses the postevent growth increase as a percentage of the preevent rate. Despite its widespread use, the method is known to be overly sensitive at low rates of prior growth and overly stringent at high rates. We present an alternative method that directly follows the percent-increase method, but instead of dividing the postevent growth rate by the preevent rate, we simply subtract the two. If the difference exceeds a predetermined species-specific threshold, the event is considered a release. This absolute-increase method has convenient properties that remedy the shortcomings of the percent-increase method. We tested the validity of the absolute-increase thresholds by binary logistic regressions, and we compared the absolute- and percent-increase methods by various methods. We conclude that for the species evaluated in this study, the absolute-increase method represents an improvement over the standard percent-increase method.

Place, publisher, year, edition, pages
2005. Vol. 35, no 7, p. 1648-1656
Keywords [en]
BEECH NOTHOFAGUS FORESTS; CANOPY RECRUITMENT; VIRGIN FOREST; NEW-HAMPSHIRE; AGE STRUCTURE; NEW-ZEALAND; HISTORY; HEMLOCK; SPRUCE; STAND
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:miun:diva-9808DOI: 10.1139/X05-092ISI: 000231887800012OAI: oai:DiVA.org:miun-9808DiVA, id: diva2:236403
Note
VR-BiologyAvailable from: 2009-09-22 Created: 2009-09-22 Last updated: 2017-12-13Bibliographically approved

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Fraver, Shawn

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CiteExportLink to record
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Citation style
  • apa
  • ieee
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