LOCATION ONIONPIE ORTentative Series
TAXONOMIC CLASS: Ashy, glassy Typic Duricryands
TYPICAL PEDON: Onionpie ashy loamy sand - ponderosa pine/antelope bitterbrush-snowbrush ceanothus/long-stolon sedge pumice plant association, woodland, on a 5 percent slope at 5320 feet elevation. (Colors are for moist soil unless otherwise noted.)
Oi--0 to 0.5 inch; slightly decomposed plant material; forest litter of needles, twigs and cones; abrupt smooth boundary. (0 to 2 inches thick)
Oe--0.5 to 1 inch; moderately decomposed plant material; forest litter of needles, twigs and cones; abrupt smooth boundary. (0 to 3 inches thick)
A--1 to 6 inches; very dark grayish brown (10YR 3/2) ashy loamy sand, dark grayish brown (10YR 4/2) dry; weak very fine granular structure; soft, very friable, nonsticky, nonplastic; many very fine, common fine, and few medium and coarse roots; many very fine irregular pores; 5 percent indurated volcanic rock gravel, 3 percent very strongly cemented cinder gravel and 1 percent moderately cemented pumice paragravel; slightly acid (pH 6.4); clear smooth boundary. (1 to 10 inches thick)
AB--6 to 18 inches; dark brown (7.5YR 3/3) ashy loamy sand, brown (7.5YR 5/4) dry; weak medium subangular blocky structure; soft, very friable, nonsticky, nonplastic; many very fine, common fine, medium and coarse, and few very coarse roots; many very fine irregular pores; 3 percent indurated volcanic rock gravel, 7 percent very strongly cemented cinder gravel and 1 percent moderately cemented pumice paragravel; slightly acid (pH 6.5); clear smooth boundary. (0 to 20 inches thick)
Bw--18 to 30 inches; very dark grayish brown (10YR 3/2) ashy loamy sand, brown (10YR 5/3) dry; weak medium subangular blocky structure; slightly hard, very friable, nonsticky, nonplastic; common very fine, and few fine, medium and coarse roots; many very fine irregular pores; 5 percent indurated volcanic rock gravel, 5 percent very strongly cemented cinder gravel and 3 percent moderately cemented pumice paragravel; neutral (pH 6.8); abrupt smooth boundary. (0 to 33 inches thick)
Bqm--30 to 40 inches; very dark grayish brown (10YR 3/2) cemented gravelly loamy sand, brown (10YR 5/3) dry; massive; hard, firm, weakly cemented by silica, nonsticky, nonplastic; few very fine, fine and medium roots; common very fine irregular pores; 7 percent indurated volcanic rock gravel, 8 percent very strongly cemented cinder gravel and 5 percent moderately cemented pumice paragravel; neutral (pH 6.8); clear wavy boundary. (6 to 30 inches thick)
C--40 to 63 inches; very dark grayish brown (10YR 3/2) gravelly ashy sand, brown (10YR 5/3) dry; massive; soft, very friable, nonsticky, nonplastic; few very fine and fine roots; common very fine irregular pores; 5 percent indurated volcanic rock gravel, 10 percent very strongly cemented cinder gravel, 5 percent indurated volcanic rock cobbles and 5 percent moderately cemented pumice paragravel; neutral (pH 6.8).
TYPE LOCATION: Klamath County, Oregon; about 16 miles south and 10 miles west of Chemult; about 2050 feet east and 750 feet south of the northwest corner of section 11, T. 30 S., R. 6 E.; Pothole Butte, Oregon USGS quadrangle; 42 degrees, 59 minutes, 32.00 seconds north latitude and 121 degrees, 58 minutes, 27.00 seconds west longitude; UTM 583620 meters E, 4760235 meters N, zone 10 NAD27.
RANGE IN CHARACTERISTICS:
Soil Temperature: cryic regime
Mean annual soil temperature - 37 to 40 degrees F
Mean summer soil temperature - 42 to 45 degrees F
Mean winter soil temperature - 32 to 35 degrees F
Soil Moisture: xeric regime; moisture control section - dry in all parts for 45 to 60 days in August to October
Particle-size control section: from mineral soil surface to top of the duripan
Andic soil properties
Ammonium oxalate extractable Al plus 1/2 Fe: 0.4 to 1.5 percent
Phosphate retention: 25 to 50 percent
Coarse silt and sand content: 75 to 95 percent of the fine earth fraction
Volcanic glass content: 30 to 70 percent
Rock fragment plus pararock fragment content: 0 to 35 percent
Water content at 1500 kPa tension: 10 to 12 percent
Diagnostic horizons and features:
Duripan, depth from mineral soil surface: 20 to 40 inches
A horizon
Hue: 7.5YR or 10YR moist or dry
Value: 2 or 3 moist, 3 to 5 dry
Chroma: 1 to 3 moist, 2 or 3 dry
Rock fragment plus pararock fragment content: 0 to 15 percent
Pumice paragravel content: 0 to 15 percent
Pumice paracobble content: 0 to 5 percent
Gravel content: 0 to 15 percent
Reaction: strongly acid to slightly acid (pH 5.1 to 6.5)
AB horizon
Depth to: 1 to 10 inches
Hue: 7.5YR or 10YR moist or dry
Value: 3 or 4 moist, 4 to 6 dry
Chroma: 2 to 4 moist, 3 or 4 dry
Texture: gravelly ashy sand, ashy loamy sand, paragravelly ashy loamy sand, gravelly ashy loamy sand
Rock fragment plus pararock fragment content: 0 to 35 percent
Pumice paragravel content: 0 to 25 percent
Pumice paracobble content: 0 to 5 percent
Gravel content: 0 to 35 percent
Reaction: strongly acid to slightly acid (pH 5.1 to 6.5)
Bw horizon
Depth to: 6 to 30 inches
Hue: 7.5YR or 10YR moist or dry
Value: 3 to 5 moist, 4 to 7 dry
Chroma: 2 to 4 moist or dry
Texture: gravelly ashy sand, ashy loamy sand, paragravelly ashy loamy sand, gravelly ashy loamy sand
Rock fragment plus pararock fragment content: 0 to 35 percent
Pumice paragravel content: 0 to 25 percent
Pumice paracobble content: 0 to 5 percent
Gravel content: 0 to 35 percent
Reaction: moderately acid to neutral (pH 5.6 to 7.3)
Bqm horizon
Depth to: 20 to 40 inches
Hue: 2.5YR, 5YR, 7.5YR or 10YR moist or dry
Value: 3 to 5 moist, 4 to 7 dry
Chroma: 2 to 4 moist or dry
Texture: cemented gravelly sand, cemented loamy sand, cemented paragravelly loamy sand, cemented gravelly loamy sand
Paragravel content: 0 to 25 percent
Paracobble content: 0 to 5 percent
Gravel content: 0 to 35 percent
Cobble content: 0 to 5 percent
Volcanic glass content: 0 to 5 percent
Ammonium oxalate extractable Al plus 1/2 Fe: 0.2 to 0.4 percent
Reaction: moderately acid to neutral (pH 5.6 to 7.3)
C horizon
Depth to: 26 to greater than 69 inches
Hue: 5YR, 7.5YR or 10YR moist or dry
Value: 2 to 5 moist, 4 to 7 dry
Chroma: 2 to 4 moist or dry
Texture: gravelly ashy sand, ashy loamy sand, paragravelly ashy loamy sand, gravelly ashy loamy sand
Paragravel content: 0 to 25 percent
Paracobble content: 0 to 5 percent
Gravel content: 0 to 35 percent
Cobble content: 0 to 5 percent
Volcanic glass content: 30 to 70 percent
Ammonium oxalate extractable Al plus 1/2 Fe: 0.2 to 0.4 percent
Reaction: moderately acid to neutral (pH 5.6 to 7.3)
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING:
Landscape - mountains
Landform - ash flow
Elevation - 4490 to 6320 feet
Slope - 2 to 40 percent
Parent material - ash flow derived from pumice and other volcanic rock
Climate - cold moist winters and cool dry summers
Mean annual air temperature - 38 to 44 degrees F
Mean annual precipitation - 20 to 46 inches
Frost-free period - 10 to 40 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Collier and
Lapine soils. Collier soils are greater than 60 inches deep.
Lapine soils are greater than 60 inches deep, have greater than 35 percent pumice paragravel in the thickest part of the particle-size control section, and formed in air-fall deposits of volcanic ash and pumice
DRAINAGE AND PERMEABILITY:
Drainage - somewhat excessively
Permeability - moderate
USE AND VEGETATION: Onionpie soils are used for timber production, wildlife habitat, watershed and recreation. Plant associations ranging from the more warm and moist to the more cool and dry, are: white fir/snowbrush ceanothus-giant chinkapin, ponderosa pine/antelope bitterbrush-snowbrush ceanothus/long-stolon sedge pumice, and ponderosa pine/antelope bitterbrush/western needlegrass pumice.
DISTRIBUTION AND EXTENT: Klamath County, Oregon; MLRA 6. Series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES PROPOSED: Winema National Forest, Klamath County, Oregon, 2008
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - 1 to 6 inches (A horizon)
Andic soil properties - 1 to 30 inches (A, AB and Bw horizons)
Duripan - 30 to 40 inches (Bqm horizon)
Particle-size control section - 1 to 30 inches (A, AB and Bw horizons)
Dark colors below the A horizon are strongly parent material related.
ADDITIONAL DATA:
NASIS SITE ID - 01-JFD-05; NASIS PEDON ID - 01OR683005