LOCATION LAMBRING OREstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, frigid Pachic Haploxerolls
TYPICAL PEDON: Lambring very cobbly loam--rangeland. (Colors are for dry soil unless otherwise noted.)
A1--0 to 7 inches; dark grayish brown (10YR 4/2) very cobbly loam, very dark brown (10YR 2/2) moist; weak very fine granular structure; soft, very friable, slightly sticky and slightly plastic; many fine roots; 5 percent stones, 15 percent cobbles, and 15 percent gravel; neutral (pH 7.2); abrupt smooth boundary. (4 to 10 inches thick)
A2--7 to 12 inches; brown (10YR 4/3) gravelly loam, very dark brown (10YR 2/2) moist; weak fine subangular blocky structure; soft, very friable, slightly sticky and slightly plastic; many fine roots; 20 percent gravel; neutral (pH 7.2); clear smooth boundary. (4 to 15 inches thick)
A3--12 to 21 inches; brown (10YR 4/3) gravelly loam, dark brown (10YR 3/3) moist; weak fine and medium subangular blocky structure; soft, very friable, slightly sticky and slightly plastic; many fine roots; common very fine tubular pores; 20 percent gravel and 10 percent cobbles; neutral (pH 7.2); clear wavy boundary. (0 to 15 inches thick)
AC--21 to 40 inches; brown (10YR 4/3) very cobbly loam, very dark grayish brown (10YR 3/2) moist; massive; soft, very friable, slightly sticky and slightly plastic; many fine roots; 10 percent stones, 25 percent cobbles, and 15 percent gravel; slightly alkaline (pH 7.4); clear wavy boundary. (0 to 30 inches thick)
C--40 to 60 inches; brown (10YR 4/3) very cobbly loam, very dark grayish brown (10YR 3/2) moist; massive; slightly hard, very friable, slightly sticky and slightly plastic; common fine roots; 20 percent cobbles, 15 percent gravel, and 10 percent stones; slightly alkaline (pH 7.4).
TYPE LOCATION: Harney County, Oregon; about 2.5 miles south of Crane Creek; in the NW1/4 of the NW1/4 of the SE1/4 of section 24, T. 26 S., R. 35 E.; USGS Venator 7.5 minute topographic quadrangle.
RANGE IN CHARACTERISTICS:
Soil moisture - The soils usually moist in winter and spring, dry in summer and fall; dry for about 60 to 90 consecutive days after the summer solstice; these soils are warmer than 41 degrees F. from May 1 to November 1 (184 days); Xeric moisture regime that borders on aridic.
Mean annual soil temperature - 40 to 47 degrees F.
Mollic epipedon thickness - 20 to 40 inches.
Depth to bedrock - 40 to more than 60 inches to a lithic contact.
Particle-size control section - Clay content: Averages 15 to 27 percent; Rock fragments: 35 to 70 percent, mainly cobbles. Lithology of fragments are volcanic rocks such as basalt, andesite, or tuff.
Reaction - Neutral or slightly alkaline.
Organic matter content - 2 to 3 percent in the surface and decreases regularly with depth.
A horizons - Value: 4 or 5 dry, 2 or 3 moist.
Chroma: 2 or 3, dry or moist.
Rock fragments: 5 to 50 percent gravel, 0 to 20 percent cobbles, and 0 to 40 percent stones. The majority of the stones when present occur in the upper part of the horizon or are loose on the surface.
Bw horizon (when present) - Texture: Very cobbly loam, extremely cobbly loam, or extremely gravelly loam.
C horizon - Value: 4 through 6 dry, 3 through 5 moist.
Chroma: 2 through 4, dry or moist.
Texture: Very cobbly loam, extremely cobbly sandy loam, or very gravelly loam.
Rock fragments: 15 to 45 percent gravel, 10 to 30 percent cobbles, and 0 to 10 percent stones.
COMPETING SERIES: These are the Baldridge, Burgi, Chambeam, Climine, Ginser, Glean, Rondowa, Shorthike (T), Sinker, Smidale, St. Anthony, Webfoot, Westbutte, and Willynat (T) series.
Baldridge soils are dry for 45 to 60 consecutive days during the summer. Burgi soils have horizons with identifiable secondary carbonates within 40 inches of the soil surface and are intermittently moist in some part during summer months due to convection storms. Chambeam soils are derived from schist and graywacke and are dominated by channers and flagstones. Climine soils have durinodes at depths of 20 to 30 inches and have less than 25 percent sand coarser than very fine sand. Ginser soils are moderately deep to paralithic contacts. Glean soils are slightly acid through neutral and have 8 to 18 percent clay in the particle-size control section. Rondowa soils formed in till derived from rocks of mixed lithology. Shorthike soils average 10 to 15 percent clay in the particle-size control section. Sinker and Westbutte soils are moderately deep to lithic contacts. Smidale soils have mollic epipedons greater than 50 inches thick and are dominated by channers in the particle-size control section. St. Anthony soils are on river terraces and are moderately deep to coarse sand and gravel. Webfoot soils have redox concentrations and endosaturation within 24 inches of the soil surface. Willynat soils have 5 to 15 percent clay in the particle-size control section and are intermittently moist for 10 to 20 days cumulative between July and October due to convection storms.
GEOGRAPHIC SETTING: Lambring soils are on mountains. They typically occur on north-facing backslope positions and are commonly associated with areas of rock outcrop and rubble land. These soils formed in colluvium derived from volcanic rocks such as basalt and andesite. Slopes are 5 to 70 percent. Elevations range from 4,000 to 6,700 feet. The climate is subhumid and characterized by cold, wet winters and warm, dry summers. The mean annual precipitation is 12 to 16 inches, the mean annual temperature is 38 to 45 degrees F., and the frost-free period is 40 to 90 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Erakatak, Observation, and Riddleranch soils and the competing Westbutte soil. Erakatak soils are clayey-skeletal, have argillic horizons, and are moderately deep to lithic contacts. Observation soils are fine-textured, have argillic horizons, and are moderately deep to lithic contacts. Riddleranch soils have cambic horizons, an aridic moisture regime, and are moderately deep to lithic contacts.
DRAINAGE AND PERMEABILITY: Well drained; high surface runoff; moderate permeability.
USE AND VEGETATION: Lambring soils are used for livestock grazing and wildlife habitat. Vegetation commonly is mountain big sagebrush, Idaho fescue, antelope bitterbrush, bluebunch wheatgrass, and Sandberg's bluegrass. In areas where rock outcrop and extremely stony surfaces are present curlleaf mountainmahogany is the dominant plant.
DISTRIBUTION AND EXTENT: South-central Oregon. These soils are moderately extensive. The series concept and main acreage is in MLRA 23, while other acreage occurs in MLRA 10.
MLRA OFFICE RESPONSIBLE: Reno, Nevada.
SERIES ESTABLISHED: Lake County (Southern Part), Oregon, 1991.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - The zone from the soil surface to 40 inches (A1, A2, A3, and AC horizons)
Particle-size control section - The zone from 10 to 40 inches (A3 and AC horizons and part of the A2 horizon).
The superactive cation exchange activity class was added in 03/2003 to the taxonomic classification by the National Soil Survey Center on request of the Reno MLRA office, without review of the soil series property data.