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Enhanced height-growth-rate equations for undamaged and damaged trees in southwest Oregon

Author: David W Hann; Mark L Hanus
Publisher: Corvallis, Or. : Oregon State University, College of Forestry, Forest Research Laboratory, [2002]
Series: Research contribution (Oregon State University. Forest Research Laboratory), 41.
Edition/Format:   Print book : State or province government publication : EnglishView all editions and formats
Summary:
Equations for predicting the 5-yr height growth rate of a tree are presented for six conifer species from southwest Oregon. Equations for the combination of undamaged and damaged trees were estimated with weighted nonlinear regression techniques. These equations are being incorporated into the new southwest Oregon version of ORGANON, a model for predicting the development of stands. The equations extend the previous  Read more...
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Additional Physical Format: Online version:
Hann, David W.
Enhanced height-growth-rate equations for undamaged and damaged trees in southwest Oregon.
Corvallis, Or. : Oregon State University, College of Forestry, Forest Research Laboratory, [2002]
(OCoLC)935170383
Material Type: Government publication, State or province government publication, Internet resource
Document Type: Book, Internet Resource
All Authors / Contributors: David W Hann; Mark L Hanus
OCLC Number: 51533191
Notes: "December 2002."
Description: 38 pages : illustrations ; 28 cm.
Series Title: Research contribution (Oregon State University. Forest Research Laboratory), 41.
Responsibility: by David W. Hann, Mark L. Hanus.

Abstract:

Equations for predicting the 5-yr height growth rate of a tree are presented for six conifer species from southwest Oregon. Equations for the combination of undamaged and damaged trees were estimated with weighted nonlinear regression techniques. These equations are being incorporated into the new southwest Oregon version of ORGANON, a model for predicting the development of stands. The equations extend the previous model to older stands and to stands with a heavier component of hardwood tree species. The effects of specific damaging agents on the 5-yr height growth rate were explored for Douglas-fir, the most frequently encountered species, and damage correction factors were estimated. The findings of this analysis indicated that damaging agents can have a significant impact upon 5-yr height growth rate, and as a result, they can lead, over time, to diversification in within-stand structure. Therefore, a full characterization of stand development should include the prediction of the presence and frequency of the various damaging agents affecting trees within the stand and their subsequent impact upon tree attributes such as total height, height to crown base, diameter growth rate, height growth rate, and mortality rate.

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