DOI: 10.1016/j.foreco.2015.09.015
Scopus记录号: 2-s2.0-84941792070
论文题名: Effects of species and hardwood-softwood mix on the balance of growth and mortality in old stands in New Brunswick, Canada
作者: Bashir A. ; MacLean D.A.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2015
卷: 358 起始页码: 192
结束页码: 201
语种: 英语
英文关键词: Mortality causes
; Periodic annual increment
; Permanent sample plots
; Stand dynamics
; Windthrow
Scopus关键词: Carbon
; Dynamics
; Hardwoods
; Softwoods
; Mortality causes
; Periodic annual increment
; Permanent sample plots
; Stand dynamics
; Windthrows
; Forestry
; basal area
; carbon sequestration
; coniferous tree
; disturbance
; ecoregion
; environmental monitoring
; forest ecosystem
; growth rate
; longevity
; mixed forest
; mortality
; regression analysis
; spatiotemporal analysis
; stand dynamics
; vulnerability
; windthrow
; Growth
; Mortality
; Softwoods
; Canada
; New Brunswick
; Abies balsamea
; Hexapoda
; Picea
英文摘要: Growth and mortality patterns influencing dynamics of older stands were studied in 602 'mature-overmature' (mean age 84-108years) permanent sample plots (PSPs) representing 12 stand types categorized as hardwood (HW), mixedwood (MW) and softwood (SW) in New Brunswick, Canada. Plots were grouped based on stand type and volume development pattern over 20years (decreasing, fluctuating, and increasing net volume change classes). Among all PSPs, 58% increased in volume from 1987 to 2007, 17% decreased, and 25% had fluctuating (variable patterns over time) volume change. Percentage of plots with decreasing volume over the 20-year period averaged 7-8% for HW and MW, versus 17% for SW. Poor site spruce (Picea sp.) and balsam fir (Abies balsamea (L.) Mill.)-spruce had the highest decreasing volume plots at 30% and 28% respectively. Mortality averaged 7.5, 4.4, and 2.2m3ha-1yr-1 for decreasing, fluctuating, and increasing volume change classes, respectively. Stands dominated by balsam fir in the decreasing volume change class sustained cumulative mortality of 118-134m3ha-1 over 20years due to short longevity, vulnerability to insect disturbance, and, versus only 10-40m3ha-1 of mortality in increasing volume change plots. Windthrow caused 56% of tree mortality. Increment of surviving trees was relatively constant among stand types and volume change classes, ranging from 2.0 to 6.1m3ha-1yr-1. Regression tree analyses showed that % basal area of balsam fir, ecoregion, and quadratic mean diameter were the most influential variables determining mortality and periodic annual increment. More than half of the PSPs in 11 of the 12 stand types had increasing volume over the 20-year period, but mortality exceeded increment in older balsam fir dominated MW and SW stands. Results show that balsam fir and spruce species were more important than broad stand types (HW, MW, SW) in determining stand dynamics, and indicate the carbon sequestration potential of older stands of different stand types. © 2015 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/65243
Appears in Collections: 影响、适应和脆弱性
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作者单位: University of New Brunswick, Faculty of Forestry and Environmental Management, P.O. Box 4400, Fredericton, NB, Canada
Recommended Citation:
Bashir A.,MacLean D.A.. Effects of species and hardwood-softwood mix on the balance of growth and mortality in old stands in New Brunswick, Canada[J]. Forest Ecology and Management,2015-01-01,358