Carkin, Richard E.; Franklin, Jerry F.; Booth, Jack; Smith, Clark E. 1978. Seeding habits of upper-slope tree species: 4. Seed flight of noble fir and Pacific silver fir. Res. Note PNW-312. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 10 p.
Noble and Pacific silver fir seed fall declined rapidly as distance from uncut timber at the edge of clearcuts increased. Observations were made at four locations in the Washington and Oregon Cascade Range.There were no differences in dispersal of sound and unsound noble fir seed but unsound Pacific silver fir seed dispersed farther than sound seed. Pacific silver fir had a higher percentage of sound seed than noble fir had for the same seed year. Differences in effectiveness of east and west cutting boundaries in seed dispersal were not consistent.
KEYWORDS: Seed dispersion, elevation, noble fir,Abies procera, Pacific silver fir, Abies amabilis, clearcutting systems.