LOCATION LOBERT OR
Established Series
Rev. JSC/AON/SMM/CEG/JTW
01/2020
LOBERT SERIES
Landscape--Intermontane basins
Landform--sand ramps on stream terraces
Slope--0 to 25 percent
Parent material--eolian and lacustrine deposits derived from diatomite, tuff, and volcanic ash
Mean annual precipitation--about 432 mm
Mean annual air temperature--about 6.7 degrees C
Depth class--very deep
Drainage class--well drained
Soil moisture regime--xeric
Soil temperature regime--frigid
Soil moisture subclass--typic
TAXONOMIC CLASS: Coarse-loamy, isotic, frigid Vitrandic Haploxerolls
TYPICAL PEDON: Lobert ashy sandy loam, on a forested north facing terrace with a slope of 2 percent and an elevation of 1280 m. When described on February 2, 2005, the soil was moist throughout. pH is by Hellige-Truog unless otherwise noted. All textures are apparent field textures.
A1--0 to 10 cm; grayish brown (10YR 5/2) dry ashy sandy loam, very dark grayish brown (10YR 3/2) moist; weak thin platy structure parting to weak very fine granular; soft, very friable, slightly sticky and nonplastic; many very fine roots; many very fine tubular pores; 5 percent fine andesite gravel; slightly acid (pH 6.5); clear smooth boundary
A2--10 to 23 cm; dark grayish brown (10YR 4/2) dry ashy sandy loam, very dark grayish brown (10YR 3/2) moist; weak medium subangular blocky structure parting to weak very fine granular; soft, very friable, slightly sticky and slightly plastic; common very fine and fine roots; few very fine tubular pores; 5 percent fine andesite gravel; neutral (pH 6.6); gradual wavy boundary
Bw1--23 to 64 cm; brown (10YR 5/3) dry ashy loam, very dark grayish brown (10YR 3/2) moist; weak coarse subangular blocky structure; soft, very friable, slightly sticky and slightly plastic; common very fine and fine roots; common very fine tubular pores; 5 percent 2 to 5 mm fine gravel; about 3 percent durinodes 1 to 3 mm diameter; neutral (pH 6.6); gradual wavy boundary
Bw2--64 to 104 cm; brown (10YR 5/3) dry ashy fine sandy loam, dark brown (10YR 3/3) moist; weak medium subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; few very fine roots; common very fine tubular pores; about 5 percent weakly cemented fine durinodes; neutral (pH 6.6); gradual wavy boundary
Bq1--104 to 127 cm; pale brown (10YR 6/3) dry ashy fine sandy loam, dark brown (10YR 3/3) moist; massive; soft, very friable, slightly sticky and nonplastic; few very fine roots; common very fine irregular pores; about 35 percent moderately cemented medium durinodes; neutral (pH 6.6); clear wavy boundary
Bq2--127 to 152 cm; pale brown (10YR 6/3) dry paragravelly ashy loamy fine sand, dark brown (10YR 3/3) moist; massive; soft, very friable; few very fine roots; many very fine pores; about 15 percent moderately cemented medium durinodes; neutral (pH 6.6)
TYPE LOCATION: Klamath County, Oregon; about 4 miles southwest of the community of Chiloquin, about 30 m north and 90 m east of the SW corner sec. 17, T. 35 S., R. 7 E.; Willamette Meridian; Agency Lake, Oregon. U. S. Geological Survey quadrangle; latitude 42.5303459 degrees north, longitude 121.9154968 degrees west, datum WGS 84 (coordinates determined with a GPS).
RANGE IN CHARACTERISTICS:
*Average annual soil temperature--6.7 to 8.3 degrees C
*Soil moisture control section--dry for 60 to 90 consecutive days within the four month period following the summer solstice
*Mollic epipedon--50 to 114 cm thick
*Base saturation throughout the Mollic epipedon--75 to 100 percent by NH4OH
Estimated properties:
*Volcanic glass content--5 to 20 percent
*Acid oxalate Al+1/2Fe--0.2 to .4 percent
*Moist bulk density--1.0 to 1.2 g/cc
15 bar water retention - 10 to 15 percent on air dried samples
*Clay content--5 to 18 percent
*Reaction--moderately acid to neutral
A horizons
*Hue--10YR, 7.5YR, or 5YR
*Value--4 or 5 dry and 2 or 3 moist
*Chroma--2 or 3 dry or moist
*Gravel content--0 to 10 percent
*Paragravel content--0 to 5 percent pumice
*Thickness--18 to 40 cm
AB horizons (present in some pedons)
*Hue--10YR, 7.5YR, or 5YR
*Value--4 or 5 dry and 2 or 3 moist
*Texture--ashy loam, ashy sandy loam, ashy coarse sandy loam
*Chroma--2 or 3 dry or moist
*Gravel content--0 to 10 percent
*Paragravel content--0 to 5 percent pumice
Bw horizons
*Hue--10YR, 7.5YR, or 5YR
*Value--4 to 6 dry and 3 or 4 moist
*Chroma--2 to 4 dry and moist
*Texture--ashy loam, ashy sandy loam, ashy fine sandy loam
*Gravel content--0 to 15 percent
*Paragravel content--0 to 15 percent weakly cemented pumice and durinodes
*Total coarse fragment content--averages less than 15 percent
*Thickness--0 to 76 cm
Bq horizon--not present in all pedons
*Hue--10YR or 7.5YR
*Value--4 to 6 dry and 3 or 4 moist
*Chroma--2 to 4 dry and moist
*Texture--paragravelly ashy fine sandy loam, paragravelly ashy loamy fine sand, ashy loam
*Gravel content--0 to 15 percent
*Paragravel content--0 to 35 percent weakly to moderately cemented durinodes
COMPETING SERIES:
Bunchpoint--mollic epipedon 25 to 50 cm thick; 15 to 35 percent rock fragments in the particle size control section; 50 to 100 cm to a lithic contact with basalt
Dinkelman--mollic epipedon 25 to 50 cm thick; 15 to 35 percent rock fragments in the particle size control section; Al plus 1/2
Fe 0.4 to 1.0 percent; 100 to 150 cm to a paralithic contact with granodiorite
Kilmerque--mollic epipedon 25 to 50 cm thick; Al plus 1/2
Fe 0.4 to 1.0 percent; 50 to 100 cm to a paralithic contact with quartz diorite
Lani--mollic epipedon 25 to 50 cm thick; 15 to 35 percent rock fragments in the particle size control section; Al plus 1/2
Fe 0.4 to 1.0 percent
Lostcreek--mollic epipedon 25 to 50 cm thick; 15 to 35 percent rock fragments in the particle size control section; Al plus 1/2
Fe 0.4 to 1.0 percent; 15-bar water retention 5 to 10 percent for air dried samples; depth to redoximorphic concentrations 100 and 150 cm (moderately well drained)
Republic--mollic epipedon 25 to 50 cm thick; 15-bar water retention 5 to 10 percent for air dried samples
Thrapp--mollic epipedon 25 to 38 cm thick; 15 to 3 percent rock fragments in the particle size control section; Al plus 1/2
Fe 0.4 to 1.0 percent; 15-bar water retention 5 to 10 percent for air dried samples; depth to densic contact and redox concentrations 89 to 114 cm (moderately deep to deep, and moderately well drained)
GEOGRAPHIC SETTING:
Elevation--1260 to 1855 m
Climate--subhumid, cold wet winters, warm dry summers
Mean annual precipitation--381 to 1145 mm
Mean annual air temperature--6.0 to 8.0 degrees C
Frost-free period--40 to 80 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Bly--argillic horizon, mollic epipedon 25 to 50 cm thick; adjacent terraces
Crume--paralithic contact at 100 to 150 cm, fine-loamy, mollic epipedon 25 to 50 cm thick; higher positions on terraces
Wolfbutte--duripan at 50 to 100 cm, mollic epipedon 20 to 50 cm thick; adjacent stream terraces
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Saturated hydraulic conductivity--high.
USE AND VEGETATION:
Use--timber production, livestock grazing, irrigated and dryland small grains, hay, pasture, homesites
Vegetation--ponderosa pine, antelope bitterbrush, Idaho fescue, Ross' sedge
DISTRIBUTION AND EXTENT: Klamath and Shasta Valleys and Basins, Oregon; MLRA 21; moderate extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Klamath County, Oregon, 1977
REMARKS:
Diagnostic horizons and other features recognized in this pedon
*Mollic epipedon--A1, A2, Bw1, Bw2 horizons
*Cambic horizon--Bw1, Bw2, Bq1, Bq2 horizons
*Vitrandic subgroup criteria--A1, A2, Bw1, Bw2, Bq1, Bq2 horizons
*Particle-size control section--the zone from 25 to 100 cm
ADDITIONAL DATA:
*NASIS Site ID: 05-SMM-001
*NASIS Pedon ID: 05OR681001
01/2017 This official series description was updated according to SSR01 Technical Note--Content and Format of Official Series Descriptions (revised 12/2015). Most of the changes were in formatting; no major technical changes were made.
1/2020 The mineralogy was changed to isotic based on laboratory data available for soils in this area.
National Cooperative Soil Survey
U.S.A.