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Permanent link (DOI): https://doi.org/10.7939/R34T24

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Factors regulating tree-herb competition in young hybrid poplar plantations Open Access

Descriptions

Other title
Subject/Keyword
weeds
hybrid poplar
competition
integrated weed management
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Henkel-Johnson, David C
Supervisor and department
Macdonald, Ellen (Renewable Resources)
Bork, Edward (Agriculture, Food and Nutritional Science)
Examining committee member and department
Bork, Edward (Agriculture, Food and Nutritional Science)
Macdonald, Ellen (Renewable Resources)
Hamann, Andreas (Renewable Resources)
Thomas, Barb (Renewable Resources)
Department
Department of Renewable Resources
Specialization
Forest Biology and Management
Date accepted
2014-01-03T13:34:21Z
Graduation date
2014-06
Degree
Master of Science
Degree level
Master's
Abstract
Hybrid poplar plantations have the potential to produce large amounts of biomass for the forest industry, but the young trees are sensitive to competition. This research attempted to quantify the influence of factors regulating competition in hybrid poplar plantations under four years old. The effects of competition varied with growing site, indicating an interaction with abiotic conditions. Nonetheless, perennial grasses overall appeared to be highly detrimental to tree growth in comparison to most forb species, especially for younger trees. Additionally, vegetation directly adjacent to the tree stem (within 0.5 m) was responsible for most of the competition for above-ground resources, and controlling near-stem vegetation resulted in large growth increases, but only for the fast-growing ‘Okanese’ clone. These results suggest that plantation managers should prioritize control of grasses while reducing above-ground biomass of all vegetation within 0.5 m of the tree stem for maximum productivity.
Language
English
DOI
doi:10.7939/R34T24
Rights
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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