LOCATION LAMBRING                OR

Established Series
Rev. TDT-TM-JVC-JBF
03/2017

LAMBRING SERIES

The Lambring series consists of deep and very deep, well drained soils that formed in colluvium derived from volcanic rocks. Lambring soils are on mountains and hills. Slopes are 5 to 70 percent. The mean annual precipitation is about 360 mm and the mean annual temperature is about 6 degrees C.

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 18 cm; 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. (10 to 25 cm thick)

A2--18 to 30 cm; 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. (10 to 38 cm thick)

A3--30 to 53 cm; 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 38 cm thick)

AC--53 to 102 cm; 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 76 cm thick)

C--102 to 152 cm; 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; latitude 43 degrees 17 minutes 51 seconds N and longitude 118 degrees 21 minutes 18 seconds W; NAD 83.

RANGE IN CHARACTERISTICS:
Soil moisture: Moist in winter and spring continuously dry in all parts for significant periods in summer and fall; xeric soil moisture regime that borders on aridic.
Mean annual soil temperature: 4 to 8 degrees C.
Mollic epipedon thickness: 50 to 100 cm.
Depth to bedrock: 100 to more than 150 cm to a lithic contact.
Reaction: Neutral or slightly alkaline.
Organic matter content: 2 to 3 percent in the surface and decreases regularly with depth

Particle-size control section - Clay content: Averages 12 to 27 percent.
Rock fragments: 35 to 70 percent. Lithology of fragments are volcanic rocks such as basalt, andesite, or tuff.
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A horizons
Value: 4 or 5 dry, 2 or 3 moist.
Chroma: 2 or 3, dry or moist.

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, extremely cobbly loamy sand or very gravelly loam.
Rock fragments: 15 to 50 percent gravel, 10 to 40 percent cobbles, and 0 to 10 percent stones.

COMPETING SERIES: These are the Baldridge, Beehunt, Burgi, Chambeam, Climine, Ginser, Glean, Lonecabin,, Rondowa, Shorthike, Sinker, Smidale, Webfoot, Westbutte, and Willynat series.
Baldridge - dry for 45 to 60 consecutive days during the summer.
Beehunt - dry for 45 or more consecutive days during the summer; particle-size control section with 60 to 80 percent rock fragments of sandstone origin; has a Bt horizon not qualifying as argillic
Burgi - have horizons with identifiable secondary carbonates within 100 cm of the soil surface and are intermittently moist in some part during summer months due to convection storms.
Chambeam - are derived from schist and graywacke and are dominated by channers and flagstones.
Climine - have durinodes at depths of 50 to 76 cm and have less than 25 percent sand coarser than very fine sand.
Ginser - are moderately deep to a paralithic contact.
Glean - have a Hue of 2,5Y in the C horizon.
Lonecabin - particle-size control section has 60 to 80 percent rock fragments of mixed metamorphic, volcanic and granitic origin; pH is slightly acid or neutral
Rondowa - formed in till derived from rocks of mixed lithology.
Shorthike - average 10 to 15 percent clay in the particle-size control section with rock fragments of mixed lithology including gneiss, schist, granodiorite and andesite.
Sinker - are moderately deep to lithic contact.
Smidale - have mollic epipedons greater than 127 cm thick and are dominated by channers in the particle-size control section.
Webfoot - have redox concentrations and endosaturation within 60 cm of the soil surface.
Willynat - 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.
Westbutte - are moderately deep to a lithic contact

GEOGRAPHIC SETTING: Lambring soils are on mountains and hills. 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 tuff, basalt and andesite. Slopes are 5 to 70 percent. Elevations range from 1,220 to 2,045 meters. The climate is subhumid and characterized by cold, wet winters and warm, dry summers. The mean annual precipitation is 300 to 400 cm, the mean annual temperature is 3 to 7 degrees C, 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 SATURATED HYDRAULIC CONDUCTIVITY: Well drained; high surface runoff; moderate permeability to moderately rapid; moderately high or high saturated hydraulic conductivity.

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 mountain mahogany 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 SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California.

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 102 cm (A1, A2, A3, and AC horizons)
Particle-size control section - The zone from 25 to 100 cm (A3 and AC horizons and part of the A2 horizon).

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National Cooperative Soil Survey
U.S.A.