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- Title
Windthrow and growth response following a spruce budworm inspired, variable retention harvest in New Brunswick, Canada.
- Authors
Wilson, Edward A.; MacLean, David A.
- Abstract
Forest management regimes increasingly focus on the emulation of natural disturbance events, e.g., fire or insect outbreaks, to help increase ecosystem sustainability. We determined the residual stand response to a variable retention harvest inspired by spruce budworm ( Choristoneura fumiferana (Clemens)) outbreaks in New Brunswick, Canada. Our objectives were to analyze the differences between surviving residual trees and those that succumbed to windthrow and to quantify growth release. The treatment was based on harvesting the estimated spruce budworm outbreak mortality, i.e., 90% of mature balsam fir ( Abies balsamea (L.) Mill., 60% of mature spruce ( Picea spp.), and no hardwoods. Windthrow increased with the proportion of trees harvested and averaged 52% over 7-9 years in these stands with high balsam fir - spruce content. One-third of 42 harvested plots sustained >30% windthrow, whereas 73% of 11 similar unharvested plots had <10% windthrow. Balsam fir had higher windthrow than spruce at 53% and 41%, respectively. Windthrown balsam fir trees had significantly larger diameters at breast height (DBH, 1.3 m), larger heights, and smaller crown ratios than surviving residual trees. Substantial growth release occurred, with DBH increment of residual trees 48%-64% greater than trees in unharvested plots. Balsam fir and intolerant hardwoods exhibited the largest growth response. We suggest that future spruce budworm inspired harvests in stands with high balsam fir - spruce content use two or three entries about 5 years apart to reduce windthrow.
- Subjects
NEW Brunswick; WINDFALL (Forestry); SPRUCE budworm; VARIABLE retention; BALSAM fir; ECOLOGICAL disturbances
- Publication
Canadian Journal of Forest Research, 2015, Vol 45, Issue 6, p659
- ISSN
0045-5067
- Publication type
Article
- DOI
10.1139/cjfr-2014-0444