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. 2018 Jul 24;9:1061.
doi: 10.3389/fpls.2018.01061. eCollection 2018.

Does a Spruce Budworm Outbreak Affect the Growth Response of Black Spruce to a Subsequent Thinning?

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Free PMC article

Does a Spruce Budworm Outbreak Affect the Growth Response of Black Spruce to a Subsequent Thinning?

Sergio Rossi et al. Front Plant Sci. .
Free PMC article

Abstract

In Canada, new forestry practices involving the natural dynamics of tree growth and regeneration are proposed for integrating forest management with biodiversity. In particular, the current spruce budworm [Choristoneura fumiferana (Clemens)] outbreak in northeastern North America is forcing natural resource managers to clarify the potential interactions between natural disturbances and commercial thinning. The aim of this study was to investigate if the spruce budworm outbreak of the 1970s affected the responses of black spruce [Picea mariana (Mill.) B.S.P.] to a subsequent thinning. Stem growth was reconstructed by measuring and cross-dating chronologies of tree-ring width of 1290 adult trees from 34 control and thinned stands within an area of 11,000 km2 in the boreal forest of the Saguenay-Lac-Saint-Jean region (QC, Canada). The treatment consisted of a low thinning performed during 1995-1999 that removed 25-35% of the basal area. Segmented models were applied to the tree-ring chronologies to define the growth pattern during the outbreak and thinning periods within a time window of 8 years, representing the average duration of the effects of defoliation on growth. Trees showed abrupt growth decreases during the outbreak, with the tree-ring index showing minimum values in 1977-1979. The tree-ring index had a flat trend before thinning, while it increased for 6-10 years after thinning. The growth pattern during the outbreak period was characterized by a reduction, mainly in trees with larger tree rings, while slow-growing trees showed less sensitivity to the disturbance. Thinning produced a significant increase in tree growth. No relationship was found between the effects of spruce budworm outbreaks in trees and the changes in growth pattern after thinning. If the timespan between the two disturbances exceeds 7 years, partial cutting can be applied independently of the growth reductions that had occurred during the outbreak. When applied in black spruce stands with high annual radial growth, thinning is expected to optimize the volume growth of the residual trees.

Keywords: Choristoneura fumiferana; Picea mariana; boreal forest; dendroecology; disturbance; growth rate; growth release; sylviculture.

Figures

FIGURE 1
FIGURE 1
Location of the study stands in the Saguenay-Lac-Saint-Jean region. White and red dots correspond to control and thinned stands, respectively.
FIGURE 2
FIGURE 2
Example of the segmented models used for identifying convex and concave growth patterns in tree-ring index during outbreak and thinning.
FIGURE 3
FIGURE 3
Tree-ring index of fast- and slow-growing black spruce trees during the spruce budworm outbreak in the Saguenay-Lac-Saint-Jean region (QC, Canada). Gray area represents the 8-year period considered by the successive analyses.
FIGURE 4
FIGURE 4
Tree-ring index of fast- and slow-growing trees before and after thinning. Gray area represents the 8-year period considered by the successive analyses.
FIGURE 5
FIGURE 5
Slope of the regressions calculated during the four years before and after spruce budworm outbreak and thinning. Box plots represent the median, drawn as a horizontal solid line, with upper and lower quartiles and whiskers achieving the 10th and 90th percentiles.
FIGURE 6
FIGURE 6
Proportion of positive and negative slopes of the regressions calculated during the 4 years before and after spruce budworm outbreak and thinning.
FIGURE 7
FIGURE 7
Proportions of concave and convex growth patterns during spruce budworm outbreak and thinning.

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