Natural regeneration dynamics of interior Douglas-fir : assessment of post-disturbance regeneration in the UBC Alex Fraser Research Forestâs (AFRFâS) Knife Creek block
department or school: Forestry, Faculty of
data provider: DSpace
degree campus: UBCV
creator: Adoasi-Ahyiah, Emmanuel
issued: 2020-09-24T17:14:04Z
issued: 2020
related degree: Master of Science - MSc
degree grantor: University of British Columbia
description: Licensees are required to regenerate interior Douglas-fir (Pseudotsuga menzisii var glauca) forest gaps greater than 0.1ha to meet and maintain species distribution across age classes for stands, biodiversity (such as mule deer winter range (MDWR)), and recreational objectives. However, little is known about the dynamics of natural regeneration in these forests. To understand future stand structure and composition, I investigated the regeneration dynamics and growth of interior Douglas-fir post-disturbance, and the influence of growing space availability on the dynamics of interior Douglas-fir regeneration and growth. I identified 181 gaps greater than 0.1 ha in the Knife Creek block of the UBC-Alex Fraser Research Forest. Sanitation harvests to control Douglas-fir beetle (Dendroctonus pseudotsugae) created salvage gaps, while biotic disturbances (e.g. windthrow) created natural gaps. Regeneration density and growth attributes of interior Douglas-fir were assessed in 600 1,000thha randomly laid circular plots across identified gaps. Growing space variables, such as slope, leaf area index (LAI), topographic wetness index (TWI), elevation, and aspect were obtained using hemispherical photographs and digital elevation models for each plot. Additionally, the distance of each plot to the gap edge, ground cover, site series and site index growing space variables were determined. Based on the findings of the study, I do not accept the hypothesis that the establishment and growth of interior Douglas-fir will increase with increasing available growing space in the gaps of regenerating Douglas-fir stands, and that growing space availability will have an influence on the establishment and growth of naturally regenerating seedlings. . However, only light (LAI) was directly measured using hemispherical photographs whereas moisture (TWI) was modelled from DEM data that may not have reflected microsite conditions. The findings of the study revealed that approximately 70% of the ga…
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/76154
note: NATURAL REGENERATION DYNAMICS OF INTERIOR DOUGLAS-FIR: ASSESSMENT OF POST-DISTURBANCE REGENERATION IN THE UBC ALEX FRASER RESEARCH FORESTâS (AFRFâS) KNIFE CREEK BLOCK by Emmanuel Adoasi-Ahyiah B.Sc., Kwame Nkrumah University of Science and Technology, 2017 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE in THE FACULTY OF GRADUATE AND POSTDOCTORAL STUDIES (Forestry) THE UNIVERSITY OF BRITISH COLUMBIA (Vancouver) September 2020 © Emmanuel Adoasi-Ahyiah, 2020 i The following individuals certify that they have read, and recommend to the Faculty of Graduate and Postdoctoral Studies for acceptance, the thesis entitled: Natural Regeneration Dynamics of Interior Douglas-fir: Assessment of Post-disturbance Regeneration in the UBC Alex Fraser Research Forestâs (AFRFâS) Knife Creek Block submitted by Emmanuel Adoasi-Ahyiah in partial fulfillment of the requirements for the degree of Master of Science In Forestry Examining Committee: Dr. Verena C. Griess, Associate Professor, Department of Forest Resources Management, UBC Supervisor Dr. Adam Polinko, Post-doctoral Fellow, Department of Forest Resources Management, UBC Supervisory Committee Member Dr. Allan Carroll, Professor, Department of Forest and Conservation Sciences, UBC Supervisory Committee Member Dr. Lori Daniels, Professor, Department of Forest and Conservation Sciences, UBC Additional Examiner ii Abstract Licensees are required to regenerate interior Douglas-fir (Pseudotsuga menzisii var glauca) forest gaps greater than 0.1ha to meet and maintain species distribution across age classes for stands, biodiversity (such as mule deer winter range (MDWR)), and recreational objectives. However, little is known about the dynamics of natural regeneration in these forests. To understand future stand structure and composition, I investigated the regeneration dynamics and growth of interior Douglas-fir post-disturbance, and the influence of growing space availability on the dyna…
has type: Thesis/Dissertation
date issued: 2020-11
is shown at: 10.14288/1.0394497
language: eng
degree discipline: Forestry
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/2429/76154