DOI: 10.1016/j.foreco.2017.05.057
Scopus记录号: 2-s2.0-85020480383
论文题名: Five decades of balsam fir stand development after spruce budworm-related mortality
作者: Virgin G.V.J. ; MacLean D.A.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2017
卷: 400 起始页码: 129
结束页码: 138
语种: 英语
英文关键词: Defoliation
; Mortality
; Regeneration
; Relative density
; Self-thinning
; Stand density index
; Stand development
Scopus关键词: Reforestation
; Defoliation
; Mortality
; Regeneration
; Relative density
; Self-thinning
; Stand density index
; Stand development
; Forestry
; defoliation
; evergreen tree
; index method
; insect
; insecticide
; mortality
; regeneration
; self thinning
; stand dynamics
; stand structure
; Canada
; New Brunswick
; Abies
; Abies balsamea
; Choristoneura fumiferana
英文摘要: We report on stand development of nine plots in northern New Brunswick, Canada from 1956 to 2012, including a severe spruce budworm (SBW; Choristoneura fumiferana [Clem.]) outbreak from 1951 to 1960 and a SBW outbreak moderated by insecticide protection from 1975 to 1988. Our objectives were to (1) determine how mortality caused by SBW defoliation altered self-thinning competition over the next 50 years; (2) compare stand development of SBW-impacted stands with that of long-term precommercial thinning trials in the same area; and (3) determine whether regeneration data and projected future stand composition supported the Baskerville hypothesis that the SBW–fir (Abies) forests of northwestern New Brunswick form a self-regulating cyclical successional system. The SBW outbreak caused 18–80% tree mortality, and this variable impact reduced relative density of host tree populations from a mean of 69% in 1956 to 22–66% by 1965. Stand development and competition-induced mortality over the next 50 years varied as a function of post-outbreak stocking. By 2012 (age 92 years), total softwood volume ranged widely from 150 to 342 m3 ha−1. Comparison with long-term published Green River Thinning Trial data indicated that both thinned and unthinned plots had higher volume at younger ages than those ‘thinned’ by SBW, and that lower stand-level production after the SBW outbreak resulted from understocked conditions. Prolific advance balsam fir regeneration was present in the plots in 2012; this and stand dynamics simulations supported the Baskerville self-regulating cyclical successional hypothesis. Results demonstrate how long-term stand development following a SBW outbreak is strongly influenced by outbreak severity and resulting stand structure. © 2017 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/64239
Appears in Collections: 影响、适应和脆弱性
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作者单位: Faculty of Forestry and Environmental Management, University of New Brunswick, P.O. Box 4400, Fredericton, NB, Canada
Recommended Citation:
Virgin G.V.J.,MacLean D.A.. Five decades of balsam fir stand development after spruce budworm-related mortality[J]. Forest Ecology and Management,2017-01-01,400