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The MScF Oral Examination of Zhuoyi Nie -FR

Author: myUNB News

Posted on Jul 30, 2018

Category: News and Notices

The MScF Oral Examination of Zhuoyi Nie  will be held on Friday, Aug. 3 at 10:30 a.m. in F & G, 202 Dean's Conference Room.

Oral Examination chaired by: Dr. G. Forbes, FOREM

Examining Committee :

Dr. K. Costanza, FOREM

Dr. R. Johns, CFS/Adjunct-Biology

Dr. D. MacLean, Supervisor, FOREM

Advisory Committee:

Dr. D. MacLean, Supervisor, FOREM

Dr. A. Taylor, CFS/Adjunct-FOREM

Thesis Title:  Effects of spruce budworm outbreaks on balsam fir regeneration in mixed balsam fir-hardwood stands.

Abstract:  Spruce budworm (Choristoneura fumiferana Clem.) defoliation on balsam fir (Abies balsamea (L.) Mill.) regeneration was studied in softwood, mixedwood, and hardwood stands in the early (three years of defoliation) and late (seven years of defoliation) stages of an outbreak. Objectives were to determine 1) effects of stand type on spruce budworm defoliation on balsam fir regeneration of different heights, and 2) effects of defoliation, canopy openness, and competition of ground vegetation on regeneration height increment. Results indicated that high hardwood content reduced defoliation by 85 per cent and mortality of balsam fir regeneration by seven per cent during the outbreak (especially in the late stage of the outbreak) and regeneration >30 cm had 10-15 per cent more defoliation than small regeneration. Severe defoliation (100 to 200 per cent) decreased height increment of balsam fir regeneration (especially tall regeneration) by 30-41 per cent and canopy openness released regeneration with light defoliation during the outbreak. Competition from ground vegetation did not significantly affect height increment.

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