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> Abstract: Fire History of Psuedotsuga
menziesii and Abies grandis Stands
Fire History of Pseudotsuga menziesii and Abies grandis
Stands in the Blue Mountains of Oregon and Washington
by K. Maruoka (University of Washington)
Fifteen sites in the Blue Mountains of Oregon and Washington were
sampled to survey fire frequency in stands ranging from Pseudotsuga
menziesii associations to dry Abies grandis associations.
Current stand structure at 80% of the sites consists of an overstory
dominated by ponderosa pine, with Douglas-fir and grand fir the
understory dominants. Pulses of establishment of Douglas-fir and
grand fir occurred after the last recorded fire at 53% of the sites,
while establishment pulses occurred amidst years of recorded fires
at 47% of the sites. Patchiness in fire severity and fire spread,
variable regeneration patterns, and sampling design may have influenced
the interpretation of current stand structure in the context of
fire. Fire scar analyses reveal high variability in fire return
intervals. Mean fire return intervals at each site range from 9.9
years to 49.0 years. Individual fire return intervals range from
2 years to 119 years, but may be highly subject to sampling limitations.
Fire frequency variability could not be linked between sites to
physical or geographic gradients.