4.7 Article

Site, plot, and individual tree yield reduction of interior Douglas-fir associated with non-lethal infection by Armillaria root disease in southern British Columbia

Journal

FOREST ECOLOGY AND MANAGEMENT
Volume 261, Issue 2, Pages 297-307

Publisher

ELSEVIER
DOI: 10.1016/j.foreco.2010.10.023

Keywords

Forest management; Forest productivity; Root disease; Armillaria solidipes; Growth reduction; Douglas-fir

Categories

Funding

  1. BC Forest Science Program
  2. Forest Investment Account and Forestry Innovation and Investment
  3. BC Ministry of Forests and Range Southern Interior Region and Research Branch
  4. Pope and Talbot Ltd.
  5. International Forest Products Ltd.
  6. Adams Lake Lumber
  7. Tolko Industries, Ltd.
  8. Kootenay Lake Timber Supply Area group
  9. Kalesnikoff Lumber Co. Ltd.
  10. Natural Resources Canada Canadian Forest Service

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Root pathogens are one of the principle factors affecting forest productivity in many forests, but few estimates of impact are available. Non-lethal root infections associated with Armillaria root disease were studied to determine their effect on stem volume yield in seven planted Douglas-fir stands and a naturally regenerated stand in British Columbia's southern interior. Trees were removed from the soil and the infection date of a random selection of trees was determined. The volume reduction attributable to disease was determined as a comparison of diseased to disease-free trees over time since infection. Volume reductions per tree ranged from 0 to 30 dm(3) (0-27%) depending on the tree age and disease duration. Yield reduction reached 27 m(3)/ha, averaging 15 m(3)/ha for the three oldest planted sites by age 30(7-15%), but was lower at the naturally regenerated site. Yield reduction at the site level correlated best with the number of diseased trees and an unknown site factor. Sites with slow juvenile growth had the least yield reduction owing to their lower incidence of disease over time. Yield was less affected by the proportion of diseased primary roots per tree than by the cumulative time since infection. A few of the diseased trees maintained growth rate after infection similar to disease-free trees: interestingly, these trees were smaller than average to begin with. Overall, trees suffer accumulating growth reduction without recovery. Root diseases prevent full expression of site potential even without mortality. Minimizing disease impact in respect to other forest management goals is also discussed. Crown Copyright (C) 2010 Published by Elsevier B.V. All rights reserved.

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