DOI: 10.1016/j.foreco.2015.10.013
Scopus记录号: 2-s2.0-84945237109
论文题名: Quantification of Dryocoetes confusus-caused mortality in subalpine fir forests of southern British Columbia
作者: Maclauchlan L.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2016
卷: 359 起始页码: 210
结束页码: 220
语种: 英语
英文关键词: Engelmann Spruce-Subalpine Fir biogeoclimatic zone
; High elevation ecosystems
; Outbreak dynamics
; Tree level surveys
; Western balsam bark beetle
Scopus关键词: Ecosystems
; Forestry
; Population statistics
; Surveys
; Bark beetle
; Continuous attacks
; Ecological and economic
; Extreme weather events
; High elevation
; Mixed-species stands
; Sub-alpine fir
; Tree level
; Ecology
; age class
; bark
; beetle
; coniferous forest
; ecozone
; extreme event
; future prospect
; mortality risk
; plant-insect interaction
; quantitative analysis
; spatiotemporal analysis
; subalpine environment
; British Columbia
; Canada
; Abies lasiocarpa
; Coleoptera
; Dryocoetes confusus
; Picea engelmannii
; Scolytinae
英文摘要: The western balsam bark beetle, Dryocoetes confusus Swaine (Coleoptera: Scolytinae), is considered the most destructive mortality agent in high elevation subalpine fir ecosystems, yet the actual impact of this beetle is not well quantified. Past estimates of in-stand losses from D. confusus in subalpine fir-dominated ecosystems have been unreliable due to historically limited and sporadic aerial survey coverage in British Columbia prior to the 1990's. Tree level aerial assessment of mature subalpine fir in southern British Columbia in 1996-1997, and again in 2014, found mortality from this beetle to be as high as 70%, with mean annual mortality rates ranging from less than one percent to 1.6% in some of the ecosystems surveyed. Over 10% of 101-120. year old stands surveyed in 1996-1997 had no visible mortality, and the mean percent mortality of this youngest cohort was 11% compared to over 17% mortality in all older age classes. By the second survey time, all age classes saw mean mortality estimates more than double, and all stands had some level of D. confusus attack. The highest increase in mortality was recorded in stands over 250 years of age. Stands surveyed in the driest, coldest Engelmann Spruce-Subalpine Fir ecosystem in southern British Columbia sustained the highest levels of attack between survey times, averaging slightly less than 27% mortality, and by 2014 total subalpine fir mortality averaged more than 46%. The rate of mortality over the past two decades has increased. As extreme weather events become more common, particularly in wetter subalpine fir ecosystems, mortality from western balsam bark beetle will be amplified, causing both ecological and economic repercussions in these ecosystems. Results clearly show that subalpine fir stands over 100 years in all ecosystems sustain continuous attack from D. confusus. To minimize future losses to this bark beetle, subalpine fir stands should be managed for a rotation age less than 100 years and mixed species stands promoted where climatically feasible. © 2015 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/65209
Appears in Collections: 影响、适应和脆弱性
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作者单位: Ministry of Forests, Lands and Natural Resource Operations, 441 Columbia Street, Kamloops, BC, Canada
Recommended Citation:
Maclauchlan L.. Quantification of Dryocoetes confusus-caused mortality in subalpine fir forests of southern British Columbia[J]. Forest Ecology and Management,2016-01-01,359