Nitrogen and mycorrhization in Pinus ponderosa and Pinus contorta germinants the first growing season after wildfire or clearcutting
department or school: Science, Irving K. Barber Faculty of (Okanagan)
department or school: Biology, Department of (Okanagan)
data provider: DSpace
degree campus: UBCO
creator: Yamaoka, Naomi K.
issued: 2022-11-29T00:14:03Z
issued: 2022
related degree: Master of Science - MSc
degree grantor: University of British Columbia
description: Although ectomycorrhizal associations have been studied in great detail in mature stands, lab settings, and greenhouse studies, very little research has been conducted examining the early stages of the symbiosis in the field. With a changing climate, fire regimes, and harvesting practices, it is imperative we understand how this relationship establishes in a natural setting. By collecting lodgepole and ponderosa pine seedlings during their first growing season in the appropriate biogeoclimatic zones, in areas that were affected by a clearcut or severe wildfire the year before, I was able to identify when signs of colonization on pine roots first began, the rate at which fungi colonized new germinants, and how this related to nutrition and growth. Seedlings collected in this study started to show signs of colonization in July, a month after germination was first observed. There was a mixture of colonized and uncolonized seedlings collected in the summer; lodgepole pine seedlings that were colonized generally had higher nitrogen contents and biomass compared to uncolonized seedlings collected at the same time. This suggests that the fungi were aiding in nutrient acquisition, even within the first weeks after mycorrhiza formation. By the end of the season, all collected seedlings had ectomycorrhizae present on their roots, so fungal inoculum did not appear to be limiting on severely burned or recently clearcut sites. The genera of fungal species present on the plant root tips did not seem to have an effect on the amount of seedling N, or biomass.
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/83318
note: Nitrogen and mycorrhization in Pinus ponderosa and Pinus contorta germinants the first growing season after wildfire or clearcutting by Naomi K. Yamaoka B.Sc., University of British Columbia Okanagan, 2018 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE in THE COLLEGE OF GRADUATE STUDIES (Biology) THE UNIVERSITY OF BRITISH COLUMBIA (Okanagan) November 2022 © Naomi Yamaoka, 2022 ii The following individuals certify that they have read, and recommend to the College of Graduate Studies for acceptance, a thesis/dissertation entitled: Nitrogen in Pinus ponderosa and Pinus contorta germinants in the first growing season after wildfire or clearcutting: the effect of mycorrhization submitted by Naomi K. Yamaoka in partial fulfillment of the requirements of the degree of Master of Science . Dr. Melanie Jones, Irving K. Barber Faculty of Science, Biology Supervisor Dr. Daniel Durall, Irving K. Barber Faculty of Science, Biology Supervisory Committee Member Dr. Barbara Hawkins, UVic, Science, Biology Supervisory Committee Member Dr. Miranda Hart, Irving K. Barber Faculty of Science, Biology Supervisory Examiner Dr. Sue Grayston, UBC V, Forestry/Forest and Conservation Sciences University Examiner iii Abstract Although ectomycorrhizal associations have been studied in great detail in mature stands, lab settings, and greenhouse studies, very little research has been conducted examining the early stages of the symbiosis in the field. With a changing climate, fire regimes, and harvesting practices, it is imperative we understand how this relationship establishes in a natural setting. By collecting lodgepole and ponderosa pine seedlings during their first growing season in the appropriate biogeoclimatic zones, in areas that were affected by a clearcut or severe wildfire the year before, I was able to identify when signs of colonization on pine roots first began, the rate at which fungi colonized new germinants, and how this related …
has type: Thesis/Dissertation
date issued: 2022-02
is shown at: 10.14288/1.0422191
language: eng
degree discipline: Biology
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
contributor: Jones, Melanie D.
type: Text
identifier URI: http://hdl.handle.net/2429/83318