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Permanent link (DOI): https://doi.org/10.7939/R39W09C84

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Regeneration dynamics of seedling-origin aspen: implications for forest reclamation Open Access

Descriptions

Other title
Subject/Keyword
forestry
land reclamation
aspen
nonstructural carbohydrates
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
King, Carolyn M
Supervisor and department
Landhäusser, Simon (Renewable Resources)
Examining committee member and department
Karst, Justine (Renewable Resources)
Hernandez Ramirez, Guillermo (Renewable Resources)
Department
Department of Renewable Resources
Specialization
Land Reclamation and Remediation
Date accepted
2017-06-22T15:08:50Z
Graduation date
2017-11:Fall 2017
Degree
Master of Science
Degree level
Master's
Abstract
Resprouting is an important adaptation to aboveground disturbance, whereby plants develop new shoots after loss or death of a portion of their aboveground biomass. Aspen (Populus tremuloides Michx.) is a foundational tree species in the boreal forests of North America and is a prolific resprouter, resprouting either through shoots on the lateral roots (suckers) or the stumps (stump sprouts). Aspen is most commonly found as part of a clonal colony, where many aboveground stems make up one genetic individual that is connected through a common root system; consequently most aspen research has focused on the clonal habit of the species. Recently, aspen have been planted as seedlings on reclamation sites and are no longer part of a connected clonal colony. I assessed the response and mechanisms of sprouting in planted aspen root systems in the field and a controlled environment. To explore the response of planted aspen to disturbance, I applied four disturbance treatments on two sites within Edmonton, AB: two cut heights and one root severing treatment in 2015, and a clearcut treatment in 2016. Treatments were applied to a large diameter and a small diameter stand. Following these disturbances I assessed the type (suckers vs. stump sprouts) and amount of regeneration at the tree and the site level; at the tree level, planted aspen produced 5 suckers each (2015) while at the stand level, this average decreased to approximately 4 suckers per initial planted tree (2016). Smaller trees produced more stump sprouts compared to larger trees, and trees cut lower to the ground produced more suckers (up to an average of eight suckers per tree). I also assessed the degree to which suckering is dependant on stored reserves of total non-structural carbohydrates (NSC, comprised of simple sugars and starch) and nitrogen (N). Short root segments were placed in a dark growth chamber and were left to sucker under otherwise optimal growth conditions. The darkness ensured that no new carbon could be assimilated, and suckering was thus solely dependent on stored reserves. A measure of initial NSC content and concentration was determined for the entire root section at the beginning of the experiment. Greater initial NSC and N reserve content resulted in a greater production of total sucker mass and total sucker height, with a trend for the production of more suckers. NSC concentration did not have a significant relationship with total sucker production; however, high initial concentrations of starch were positively and significantly related to the relative production of suckers (i.e. once the root size had been controlled for). Overall, this research indicates that root system size and initial reserve status will impact the extent and type of resprouting in aspen, with larger roots producing more suckers, and larger trees producing fewer stump sprouts.
Language
English
DOI
doi:10.7939/R39W09C84
Rights
This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for the purpose of private, scholarly or scientific research. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
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