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Permanent link (DOI): https://doi.org/10.7939/R3704J

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Mountain pine beetle outbreak and ectomycorrhizal feedback: the ecology of recovery in beetle killed forests Open Access

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Other title
Subject/Keyword
nutrient cycling
white spruce
soil chemistry
lodgepole pine
seedling
moutain pine beetle
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Cigan, Paul W
Supervisor and department
James F. Cahill, Jr. (Biological Sciences)
Nadir Erbilgin (Department of Renewable Resources)
Examining committee member and department
M. Derek MacKenzie (Department of Renewable Resources)
Victor J. Lieffers (Department of Renewable Resources)
Department
Department of Renewable Resources
Specialization
Forest Biology and Management
Date accepted
2014-01-30T10:48:29Z
Graduation date
2014-06
Degree
Master of Science
Degree level
Master's
Abstract
The expansion of mountain pine beetle (Dendroctonus ponderosae; MPB) into naïve host ecosystems has been met by gaps in two key areas of research: (A) affects on the chemistry of forest soils, and (B) impacts on the regeneration of tree seedlings. To investigate linkages between both, we paired observational field and experimental greenhouse studies. In the field study, we used a natural continuum of recent (0-3 yrs) MPB-caused tree mortality (0-84%) in naïve lodgepole pine-dominated (Pinus contorta) forests in northwestern Alberta, to quantify impacts of MPB outbreak on: (1) input rates of pine needle-derived nutrients; (2) supply rates of plant-available nutrients; (3) concentrations of soil phenols. We found positive associations between tree mortality and pine needle nutrient concentrations (of nitrogen, phosphorus, potassium, calcium, and magnesium) and inputs (of nitrogen and phosphorus). The supply rates for plant available nitrate, and concentrations of soil phenols were altered by MPB disturbance. In the greenhouse study, we tested the main effects and interactions of (1) light intensity, (2) pine needle litter addition, and (3) soil inoculation on first-year growth of seedlings of lodgepole pine and white spruce (Picea glauca). Soil inoculation had the greatest impact on accumulations of biomass, and sugar and starch reserves. Seedlings of lodgepole pine grown with inocula originating from uninfested stands had enhanced biomass accumulation relative to controls; accumulation was reduced when seedlings were inoculated with soils from MPB-infested stands. Changes in soil microbial communities may limit pine regeneration following outbreak, but field studies are needed confirm this effect.
Language
English
DOI
doi:10.7939/R3704J
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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