LOCATION LABUCK OR+IDEstablished Series
TAXONOMIC CLASS: Coarse-loamy, isotic, frigid Vitrandic Haploxerepts
TYPICAL PEDON: Labuck loam, forested. (Colors are for moist soil unless otherwise noted.)
Oi--1 inch to 0; pine needles and twigs.
A--0 to 6 inches; dark brown (10YR 4/3) loam, light brownish gray (10YR 6/2) dry; weak fine granular and weak fine subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; many very fine and fine roots; many very fine tubular pores; 10 percent gravel, 2 to 6 mm in diameter; slightly acid (pH 6.4); gradual wavy boundary. (5 to 10 inches thick)
Bw1--6 to 14 inches; yellowish brown (10YR 5/4) loam, pale brown (10YR 6/3) dry; weak medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine and fine roots; many very fine tubular pores; 10 percent gravel 2 to 6 mm in diameter; slightly acid (pH 6.2); gradual wavy boundary. (7 to 16 inches thick)
Bw2--14 to 21 inches; yellowish brown (10YR 5/4) gravelly loam, pale brown (10YR 6/3) dry; slightly hard, friable, slightly sticky and slightly plastic; common very fine and fine roots; common very fine irregular pores; 20 percent gravel, 2 to 6 mm in diameter; moderately acid (pH 6.0); gradual wavy boundary. (7 to 14 inches thick)
C--21 to 31 inches; yellowish brown (10YR 5/4) very gravelly coarse sandy loam, pale brown (10YR 6/3) dry; massive; hard, friable, 36 percent gravel; moderately acid (pH 6.0); clear wavy boundary. (0 to 12 inches thick)
Cr--31 inches; yellowish brown (10YR 5/4) partially decomposed granodiorite, light yellowish brown (10YR 6/4) dry.
TYPE LOCATION: Morrow County, Oregon; SE1/4 SE1/4 NE1/4 section 9, T.4S., R.29E.
RANGE IN CHARACTERISTICS: The mean annual soil temperature ranges from about 44 to 47 degrees F. The soils are usually moist but are dry throughout between depths of 4 and 12 inches for 60 to 80 consecutive days during the summer. The solum is 10 to 30 inches thick and the depth to a paralithic contact is 20 to 40 inches. Hue of the solum is 10YR or 7.5YR. Volume of rock fragments, dominantly fine gravel, ranges from 5 to 15 percent in the A horizon and 15 to 35 percent in the B and C horizons. The particle size control section is loam to coarse sandy loam and averages 10 to 18 percent clay. The upper 7 to 14 inches is estimated to have a moist bulk density of 1.10 to 1.35 g/cc, volcanic glass content of 5 to 20 percent, and acid oxalate extractable aluminum plus one-half iron of 0.4 to 1.0 percent.
The A horizon has value of 2 to 4 moist, 4 to 6 dry and chroma of 2 or 3 moist and dry. It has weak granular or subangular blocky structure.
The Bw horizon has value of 3 or 4 moist, 5 to 7 dry, and chroma of 3 or 4 moist, 2 to 4 dry. It has weak or moderate medium subangular blocky structure.
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: The Labuck soils are on south-facing slopes with gradients 5 to 35 percent. Elevations are 3,500 to 4,650 feet. The soils formed in colluvium weathered from granodiorite with an influence of volcanic ash and loess in the surface. The climate is characterized by hot dry summers and cold wet winters. The mean July temperature is 60 degree F.; the mean January temperature is 30 degrees F.; the mean annual temperature is 42 to 45 degrees F. The mean annual precipitation 20 to 26 inches. The frost free period is 50 to 100 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Tolo soils. Tolo soils are ashy over loamy.
DRAINAGE AND PERMEABILITY: Well drained; moderate permeability.
USE AND VEGETATION: Principal use is timber production. Other uses include grazing, wildlife habitat, and recreation. Vegetation is mainly ponderosa pine, Douglas fir, and oceanspray.
DISTRIBUTION AND EXTENT: Southeastern Morrow County and northcentral Idaho; MLRA 43. The series is inextensive.
MLRA OFFICE RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Morrow County, Oregon, 1977.
REMARKS: This draft reflects a change in classification from mixed to isotic minerology.
Diagnostic horizons and features in this pedon are:
Ochric epipedon - from 0 to 6 inches (A horizon)
Cambic horizon - from 6 to 21 inches (Bw1 and Bw2 horizons)
Particle-size control section - from 10 to 31 inches.
ADDITIONAL DATA: Characterization data for one pedon (S76-OR-49-1) from Oregon State University.