Variation in wood anatomical structure of Douglas-fir defoliated by the western spruce budworm: a case study in the coastal-transitional zone of British Columbia, Canada
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An outbreak of the western spruce budworm temporarily modifies cellular wood anatomy of stem wood in natural and mature Douglas-fir stands impacting wood quality properties.
Western spruce budworm (Choristoneura occidentalis Freeman) is a widespread and destructive defoliator of commercially important coniferous forests in western North America. In British Columbia, Canada, Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco] is the most important and widely distributed host. Permanent sample plots were established at a number of locations in southern interior at the beginning of a severe western spruce budworm outbreak in the 1970s. Two of the sites were sampled in 2012 to determine whether modifications had occurred in the anatomical characteristics of stem wood formed during outbreak years. We determined that rings formed during the western spruce budworm 1976–1980 outbreak had a significantly lower proportion of latewood, reduced mean cell wall thickness and smaller radial cell diameters. While the cellular characteristics of the earlywood remained fairly constant, significant reductions in lumen area occurred in 1978 and 1979 at each site. Our study shows that western spruce budworm outbreaks not only reduce annual radial growth, but also temporarily modify cellular characteristics in latewood cells, which has implications for wood density and quality in Douglas-fir.
KeywordsCellular anatomy Tracheids Dendroecology Douglas-fir Western spruce budworm Defoliation event
Author contribution statement
J. A. developed the study and hypothesis, conducted field, laboratory work, and statistical testing, primarily wrote the manuscript and produced tables and figures. A. B. supported statistical analyses. R. A. assisted in re-locating original permanent sample plots, provided the permanent plot dataset, contributed to the Study Area and Methods sections, and reviewed edited the manuscript. D. S. assisted in hypothesis development, contributed to the Introduction, Methods and Results sections and reviewed and edited the manuscript. H. G. contributed to hypothesis development, methodological development, supported wood anatomy and micro sectioning methods and interpretation, and contributed to the entire manuscript.
This study was made possible through funding from the Natural Science and Engineering Research Council (Axelson and Smith) and Michael Smith Foreign Supplement Award (Axelson) and the Pacific Institute for Climate Solutions (Axelson and Smith). We are grateful for assistance provided in the field by Peter Sprague, and at WSL Birmensdorf from Fritz Schweingruber and Loïc Schneider.
Conflict of interest
The authors declare that they have no conflict of interest.
- Alfaro R, Maclauchlan LE (1992) A method to calculate the losses caused by western spruce budworm in uneven-aged Douglas fir forests of British Columbia. For Ecol Manage 55:295–313. doi: 10.1016/0378-1127(92)90107-K
- Battisti A (2008) Forests and climate change—lessons from insects. iForest 1:1–5Google Scholar
- British Columbia Ministry of Forests, Lands and Natural Resource Operations (2012) Facts about B.C.’s Mountain pine beetle. http://www.for.gov.bc.ca/hfp/mountain_pine_beetle/facts.htm
- Buxton K, Maclauchlan L (2012–2001) Overview of forest health conditions in southern B.C. Ministry of Forests, Lands and Natural Resource Operations, Kamloops, BC http://www.for.gov.bc.ca/rsi/ForestHealth/Overview.htm
- Cook E, Kairiukstis L (eds) (1990) Methods of dendrochronology: applications in the environmental sciences. Springer, BerlinGoogle Scholar
- Cook E, Krusic P, Holmes R et al. (2007) Program ARSTAN version 41d. www.ldeo.columbia.edu/tree-ring-laboratory
- Fellin D, Dewey J (1982) Western spruce budworm. Forest insect and disease leaflet 53. USDA, Forest ServiceGoogle Scholar
- Furniss R, Carolin V (1977) Western forest insects. United States Department of Agriculture, Forest Service. Miscellaneous Publication No.1339, WashingtonGoogle Scholar
- Gärtner H, Schweingruber F (2013) Microscopic preparation techniques for plant stem analysis. Verlag Dr, KesselGoogle Scholar
- Giraudoux P (2013) Pgirmess: data analysis in ecology. R package version 1.5.8. http://cran.r-project.org/web/packages/pgirmess/index.html
- Green R, Klinka K (1994) A field guide to site identification and interpretation for the Vancouver Forest region. Ministry of Forests, Victoria (Land Management Handbook No 28)Google Scholar
- Holmes R (1986) Users manual for program COFECHA. In: Holmes R, Adams R, Fritts H (eds) Tree- ring chronologies of western North America: California, eastern Oregon and northern Great Basin. University of Arizona, Tucson, Ariz, pp 41–49Google Scholar
- Johnston M, Williamson T, Munson A et al (2010) Climate change and forest management in Canada: impacts, adaptive capacity and adaptation options. A State of Knowledge report, Sustainable Forest Management Network, Edmonton, Alberta, p 54Google Scholar
- Kozlowski T (1969) Tree physiology and forest pests. J For 67:118–123Google Scholar
- Mason R, Wickman B, Paul H (1997) Radial growth response of Douglas-fir and Grand fir to larval densities of the Douglas-fir tussock moth and western spruce budworm. For Sci 43:194–205Google Scholar
- Reich P, Walters M, Krause S, et al (1993) Growth, nutrition and gas exchange of Pinus resinosa following artificial defoliation. Trees 7:67–77Google Scholar
- R Core Team (2013) R: A language and environment for statistical computing. R Foundation for Statistical Computing, Vienna, Austria. ISBN 3-900051-07-0, http://www.R-project.org/
- Sala A, Woodruff DR, Meinzer FC (2012) Carbon dynamics in trees: feast or famine? Tree Physiol 32:764–75. doi: 10.1093/treephys/tpr143
- Spittlehouse D (2008). Climate Change, impacts, and adaptation scenarios: climate change and forest and range management in British Columbia. B.C. Min. For. Range, Res. Br., Victoria, BC Technical report 045. http://www.for.gov.bc.ca/hfd/pubs/Docs/Tr/Tr045.htm
- Stokes M, Smiley T (1968) An introduction to tree-ring dating. University of Chicago Press, ChicagoGoogle Scholar
- Walker I, Sydneysmith R (2008) Chapter 8: British Columbia in from impacts to adaptation: canada in a changing climate 2007.In: Lemmen D, Warren F, Lacroix J, Bush E (eds.) Government of Canada, OttawaGoogle Scholar
- Wickham H, Chang W (2013) ggplot2: An implementation of the grammar of graphics. R package version 0.9.3.1. http://cran.r-project.org/web/packages/ggplot2/index.html
- Wickman B, Mason R, Paul H (1992) Thinning and nitrogen fertilization in a grand fir stand infested with western spruce budworm. Part II: tree growth response. For Sci 38(2):252–264Google Scholar