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A pilot study of increment cores from young defoliated western hemlock on Haida Gwaii Nethercut-Wells, Acacia

Abstract

Increment cores from five stands on Haida Gwaii, British Columbia were measured to identify radial growth suppressions caused by western blackheaded budworm (Acleris gloverana) defoliation. Z-scores were calculated based on annual basal area to identify periods of suppression and to quantify the severity of the suppression. Comparisons between stands illustrated an association between certain stand characteristics (density and age) and indicators of defoliation severity (percent mortality of western hemlock, suppressions per tree, and length of time suppression lasted). Although this pilot study was not able to make conclusions about growth suppressions and their relation to defoliation, it played an integral role in the development of further studies that will be able to achieve this.

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Title
A pilot study of increment cores from young defoliated western hemlock on Haida Gwaii
Creator
Nethercut-Wells, Acacia
Date Issued
2012-04-09
Description
Increment cores from five stands on Haida Gwaii, British Columbia were measured to identify radial growth suppressions caused by western blackheaded budworm (Acleris gloverana) defoliation. Z-scores were calculated based on annual basal area to identify periods of suppression and to quantify the severity of the suppression. Comparisons between stands illustrated an association between certain stand characteristics (density and age) and indicators of defoliation severity (percent mortality of western hemlock, suppressions per tree, and length of time suppression lasted). Although this pilot study was not able to make conclusions about growth suppressions and their relation to defoliation, it played an integral role in the development of further studies that will be able to achieve this.
Subject
Increment cores; Haida Gwaii; Western blackheaded budworm (Acleris gloverana); Defoliation; Western Hemlock
Genre
Graduating Project
Type
Text
Language
eng
Series
University of British Columbia. FRST 497
Date Available
2012-07-13
Provider
Vancouver : University of British Columbia Library
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International
DOI
10.14288/1.0075539
URI
http://hdl.handle.net/2429/42708
Affiliation
Forestry, Faculty of
Campus
UBCV
Peer Review Status
Unreviewed
Scholarly Level
Undergraduate
Rights URI
http://creativecommons.org/licenses/by-nc-nd/4.0/
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DSpace

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Attribution-NonCommercial-NoDerivatives 4.0 International