globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.foreco.2014.10.002
Scopus记录号: 2-s2.0-84908583964
论文题名:
Multicentury reconstruction of western spruce budworm outbreaks in central British Columbia, Canada
作者: Axelson J.N.; Smith D.J.; Daniels L.D.; Alfaro R.I.
刊名: Forest Ecology and Management
ISSN:  0378-1127
出版年: 2015
卷: 335
起始页码: 235
结束页码: 248
语种: 英语
英文关键词: Cariboo Forest Region ; Dendroecology ; Douglas-fir ; Outbreaks ; Species range ; Western spruce budworm
Scopus关键词: Dendroecology ; Douglas fir ; Forest regions ; Outbreaks ; Species ranges ; Spruce budworm ; biochronology ; commercial species ; coniferous forest ; coniferous tree ; dendrochronology ; insect ; pest species ; plant-herbivore interaction ; population distribution ; population outbreak ; reconstruction ; British Columbia ; Canada ; Canada ; Cariboo Mountains ; Columbia Mountains ; Choristoneura occidentalis ; Pseudotsuga ; Pseudotsuga menziesii
英文摘要: The western spruce budworm (Choristoneura occidentalis Freeman; WSB) is a widespread and destructive defoliator of commercially important coniferous forests in western North America. In British Columbia, Canada, Douglas-fir (Pseudotsuga menziesii) is the most prevalent host, and records show that significant outbreaks have primarily occurred in the southern interior over the last century. In the central interior of British Columbia, particularly in the Cariboo Forest Region, the most recent outbreak of western spruce budworm, which is in its second decade, has been severe and widespread. It is perhaps due to this long outbreak, which is unprecedented in duration since detailed surveys began in the 1950s, that there is an anecdotal perception that the western spruce budworm is expanding its range northward into the region, affecting Douglas-fir near the edge of its northern distribution. However, very little is known about the long-term outbreak history of western spruce budworm in the central interior of the province. In this study we used 11 Douglas-fir host chronologies and 2 regional Pinus non-host chronologies to reconstruct western spruce budworm outbreaks over a 435-year period. Standard dendrochronological techniques were used to develop tree-ring chronologies at each site and the program OUTBREAK was used to detect outbreak periods. We reconstructed 12 outbreaks starting in early 1600s with a mean return interval of 30. years. Sensitivity analysis illustrated that including light, moderate and severe intensity thresholds modified the number of reconstructed outbreaks, their duration and mean return interval. Sub-regional chronologies based on biogeoclimatic subzones and variants (BEC units), revealed strong synchrony of some outbreak events, but not all. Wavelet analysis of the sub-regional chronologies demonstrated the quasi-periodic behavior of western spruce budworm over the entire record, which averaged 32-years. By reconstructing WSB dynamics over 400. years we demonstrated that outbreaks observed over the last 40. years in the Cariboo Forest Region are not unprecedented. © 2014 Published by Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/65638
Appears in Collections:影响、适应和脆弱性

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作者单位: British Columbia Ministry of Forests, Lands, Natural Resource Operations, Cariboo Forest Region, Williams Lake, BC, Canada; University of Victoria Tree-Ring Laboratory, Department of Geography, University of Victoria, Victoria, BC, Canada; Tree-Ring Lab at UBC, Department of Forest and Conservation Sciences, University of British Columbia, Vancouver, British Columbia, Canada; Canadian Forest Service, Pacific Forestry Centre, Victoria, British Columbia, Canada

Recommended Citation:
Axelson J.N.,Smith D.J.,Daniels L.D.,et al. Multicentury reconstruction of western spruce budworm outbreaks in central British Columbia, Canada[J]. Forest Ecology and Management,2015-01-01,335
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