Environment and forest regeneration in the Illinois Valley area of southwestern Oregon.

Abstract

Multiple regression analyses were used to relate environmental factors to forest regeneration on clearcut and partial cut areas managed by the Bureau of Land Management in the Illinois Valley area southwest of Grants Pass, Oregon. Difficulty of regenerating clearcuttings at elevations between 3,000 and 4,900 feet (914 and 1 494 m) increased with increases in soil coarse fragments, solar radiation, and slash burning. Difficulty of regenerating clearcuttings at elevations between 1,500 and 2,900 feet (457 and 884 m) increased as solar radiation, shrub cover, grass cover, and surface rock plus gravel increased. Difficulty of regenerating partial cuts increased as moisture, slope, soil silt plus clay, and density of canopy increased.

Citation

Minore, Don; Graham, Joseph N.; Murray, Edward W. 1984. Environment and forest regeneration in the Illinois Valley area of southwestern Oregon. Res. Note PNW-RN-413. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 20 p