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Reconstructed height growth trajectories of white spruce (Picea glauca) following deciduous release Open Access


Other title
White spruce height growth and site index
Deciduous competition
Type of item
Degree grantor
University of Alberta
Author or creator
Osika, Diana E-B
Supervisor and department
Comeau, Phil (Renewable Resources)
Stadt, Ken (Renewable Resources)
Examining committee member and department
Stadt, Ken (Renewable Resources)
Comeau, Phil (Renewable Resources)
Bork, Edward (Department of Agricultural, Food and Nutritional Sciences)
Armstrong, Glen (Renewable Resources)
Department of Renewable Resources
Forest Biology and Management
Date accepted
Graduation date
Master of Science
Degree level
My study evaluated the “true” white spruce (Picea glauca [Moench] Voss) height growth potential in sites released from deciduous competition. Stem analysis, plus re-measurement data from 60 and 80-year-old trials were used. Interpolated site index (SI, height at breast height age 50) of released spruce was not significantly increased due to late treatment application. However, their height increment 50 years following treatment was elevated by 2.1m. Existing height-age equations for this region showed varying suitability. I fit a new height-age model which allowed for delayed release, this showed a potential 4.1m increase in spruce SI due to release. In a site-specific model, deciduous basal area removal explained significant variation in spruce SI. This model indicated a 7m gain from early release from heavy competition. These results provide a first long-term estimate of the degree that spruce height growth from mid-age to maturity can be increased by deciduous competition removal.
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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