The effect of vineyard ground cover vegetation on soil fungi and plant-soil feedback
department or school: Arts and Sciences, Irving K. Barber School of (Okanagan)
department or school: Biology, Department of (Okanagan)
data provider: DSpace
degree campus: UBCO
creator: Vukicevich, Eric Kraemer
issued: 2019-03-25T21:18:30Z
issued: 2019
related degree: Doctor of Philosophy - PhD
degree grantor: University of British Columbia
description: Groundcover vegetation is managed in vineyards for many purposes including for soil quality, trafficability, and pest and fertility management. Because plants are major drivers of soil biota, groundcover identity could also cause changes in soil microbial communities that then influences vine health. Using greenhouse and field trials as well as a multi-year survey of Okanagan valley vineyards, I studied the effect of groundcover identity and management on soil fungi known to be important in influencing vine health and growth attributable to these plant-soil feedbacks. Overall, groundcover vegetation influenced abundances of each of the studied guilds of soil fungi in the drive row, with plant effects on the entomopathogenic Beauveria bassiana being the most consistent. Under vine living mulches, however, did not affect these same groups of fungi. When soil trained by different groundcovers from the same field were used as microbial inoculant in the greenhouse, they led to differences in arbuscular mycorrhizal (AM) communities in vine roots, but differences in vine growth were only seen when a pathogen was also included. Taken together, these results suggest that groundcover vegetation does influence soil fungi in drive rows of Okanagan vineyards. Certain groundcovers may provide ecosystem services such as conservation biological control of pest insects through increases in entomopathogenic fungi, improved carbon sequestration and soil structure through increases in AM fungi, and deterrence of soil-borne pathogens. However, feedback effects on vines in this dissertation were limited to abiotic competitive effects in the field and biotic responses in the greenhouse, suggesting a high degree of context-dependency of plant-soil feedbacks in this system.
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/69211
note: THE EFFECT OF VINEYARD GROUNDCOVER VEGETATION ON SOIL FUNGI AND PLANT-SOIL FEEDBACK by Eric Kraemer Vukicevich A THESIS SUBMITTED IN PARTIAL FULLFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY in The College of Graduate Studies (Biology) THE UNIVERSITY OF BRITISH COLUMBIA (Okanagan) March 2019 © Eric Kraemer Vukicevich, 2019 ii The following individuals certify that they have read, and recommend to the College of Graduate Studies for acceptance, a dissertation entiled: THE EFFECT OF VINEYARD GROUNDCOVER VEGETATION ON SOIL FUNGI AND PLANT-SOIL FEEDBACK submitted by __Eric Kraemer Vukicevich__in partial fulfillment of the requirements of the degree of ___Doctor of Philosophy in Biology__ . Dr. Miranda Hart, Irving K. Barber School of Arts and Sciences Supervisor Dr. D. Thomas Lowery, Agriculture and Agri-Food Canada, Summerland Co-Supervisor Dr. David Scott, Irving K. Barber School of Arts and Sciences University Examiner Dr. Dario Cantu, University of California, Davis External Examiner Additional committee members include: Dr. Pat Bowen, Agriculture and Agri-Food Canada, Summerland Supervisory Committee Member Dr. José Ramon Úrbez-Torres, Agriculture and Agri-Food Canada, Summerland Supervisory Committee Member iii Abstract Groundcover vegetation is managed in vineyards for many purposes including for soil quality, trafficability, and pest and fertility management. Because plants are major drivers of soil biota, groundcover identity could also cause changes in soil microbial communities that then influences vine health. Using greenhouse and field trials as well as a multi-year survey of Okanagan valley vineyards, I studied the effect of groundcover identity and management on soil fungi known to be important in influencing vine health and growth attributable to these plant-soil feedbacks. Overall, groundcover vegetation influenced abundances of each of the studied guilds of soil fungi in the drive row, with plant effects on the entomopathogenic Be…
has type: Thesis/Dissertation
date issued: 2019-05
is shown at: 10.14288/1.0377513
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
type: Text
identifier URI: http://hdl.handle.net/2429/69211