Skip to Main Content
Natural regeneration 10 years after a Douglas-fir tussock moth outbreak in northeastern Oregon.Author(s): B.E. Wickman; K.W. Seidel; G. Lynn Star
Source: Res. Pap. PNW-RP-370. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 15 p
Publication Series: Research Paper (RP)
Station: Pacific Northwest Research Station
Download Publication (1.04 MB)
DescriptionA survey of natural regeneration 10 years after severe grand fir mortality caused by an outbreak of Douglas-fir tussock moth was conducted in the Wenaha-Tucannon Wilderness in the Blue Mountains of northeastern Oregon. Seedling stocking was only moderate, but seedling density was adequate where present. Grand fir is dominating both preoutbreak and postoutbreak regeneration, but ponderosa pine has increased substantially over preoutbreak levels. The largest seedlings are larch, spruce, and pine. These species have the fastest juvenile growth rate and also were not severely defoliated during the outbreak. Certain environmental factors affecting regeneration did not produce strong correlations other than some obvious relations like distance to nearest seed tree. There was a weak positive relation of regeneration density with the presence of litter. Given the past and present management regimes for this area, the pattern of gradual stand dominance by grand fir is the result of natural succession and lack of ground fires. Within a hundred years, history will probably repeat itself with a severe tussock moth outbreak that again reduces the grand fir component of the stand.
- You may send email to email@example.com to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationWickman, B.E.; Seidel, K.W.; Star, G. Lynn. 1986. Natural regeneration 10 years after a Douglas-fir tussock moth outbreak in northeastern Oregon. Res. Pap. PNW-RP-370. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 15 p
KeywordsRegeneration (stand), Douglas-fir tussock moth, Orgyia pseudotsugata, grand fir, Abies grandis, regeneration (natural), mixed stands, Blue Mountains- Oregon, Oregon (Blue Mountains), insect damage-forest
- Silvics of grand fir
- Uneven-aged silviculture in cedar-hemlock-grand fir ecosystems of the northern Rocky Mountains
- Mammoth lakes revisited—50 years after a Douglas-fir tussock moth outbreak.
XML: View XML