LOCATION CENPLAT CAEstablished Series
The Cenplat series consists of moderately deep, well drained soils that formed in tephra over residuum from volcanic rock. Cenplat soils are on glacially scoured lava plateaus in the Southern Cascade mountains. Slopes range from 0 to 60 percent. The mean annual precipitation is about 53 inches (1346 mm) and the mean annual temperature is about 42 degrees F (6 degrees C).
TAXONOMIC CLASS: Ashy over medial-skeletal, glassy over amorphic, frigid Typic Haploxerands
TYPICAL PEDON: Cenplat ashy loamy sand, on a southeast facing (186 degrees) slope of 15 percent, under a cover of California red fir, western white pine, and pinemat manzanita at an elevation of 7196 feet, (2193 m). When described on 6/13/2007, the soil was dry throughout. (Colors are for dry soil unless otherwise noted).
Oi--0 to 0 inches (0 to 1 cm); slightly decomposed needles, twigs and leaf litter; abrupt smooth boundary.
A--0 to 2 inches (1 to 6 cm); grayish brown (10YR 5/2) ashy loamy sand, very dark gray (10YR 3/1) moist; 2 percent clay; weak very thick platy structure; loose, nonsticky, nonplastic; common very fine and fine roots; few fine tubular and many very fine and fine interstitial pores; 10 percent subangular fine gravel and 3 percent subangular medium gravel; slightly acid, pH 6.5 by Hellige-Truog; NaF pH 9.1; clear wavy boundary (1 to 4 inches (2.5 to 10 cm) thick).
C1--2 to 5 inches (6 to 13 cm); white (10YR 8/1) ashy sand, grayish brown (2.5Y 5/2) moist; 0 percent clay; weak fine and medium subangular blocky structure; loose, nonsticky, nonplastic; many very fine and fine, and common medium roots; many very fine and fine interstitial and few fine and medium tubular pores; 3 percent subangular fine gravel and 2 percent subangular medium and coarse gravel; neutral, pH 6.8 by Hellige-Truog; NaF pH 9.3; abrupt wavy boundary.
C2--5 to 8 inches (13 to 21 cm); white (10YR 8/1) extremely cobbly ashy coarse sand, grayish brown (10YR 5/2) moist; 0 percent clay; single grain; loose, nonsticky, nonplastic; few very fine and fine, and common medium roots; many very fine to medium interstitial pores; 16 percent subangular fine gravel, 10 percent subangular medium and coarse gravel, 25 percent subangular cobbles, and 10 percent subangular stones; neutral, pH 6.8 by Hellige-Truog; NaF pH 10.0; abrupt wavy boundary. (Combined thickness of the C horizon is 2 to 7 inches (5 to 18 cm) thick).
2Bwb1--8 to 17 inches (21 to 43 cm); pale brown (10YR 6/3) extremely cobbly medial sandy loam, dark yellowish brown (10YR 3/4) moist; 8 percent clay; weak very fine subangular blocky structure parting to single grain; loose, nonsticky, nonplastic; many very fine to medium, and common coarse and very coarse roots; many very fine and fine irregular, and common fine tubular pores; 5 percent subangular fine gravel, 12 percent subangular medium and coarse gravel, 40 percent subangular cobbles, 20 percent subangular stones, and 5 percent subangular boulders; slightly acid, pH 6.5 by Hellige-Truog; NaF pH 10.7; clear smooth boundary.
2Bwb2--17 to 24 inches (43 to 60 cm); light yellowish brown (10YR 6/4) extremely cobbly medial sandy loam, dark yellowish brown (10YR 4/4) moist; 5 percent clay; weak very fine subangular blocky structure parting to single grain; loose, nonsticky, nonplastic; many very fine to medium, and common coarse and very coarse roots; many very fine and fine irregular and common fine tubular pores; 5 percent subangular fine gravel, 5 percent subangular medium and coarse gravel, 40 percent subangular cobbles, 20 percent subangular stones, and 5 percent subangular boulders; slightly acid, pH 6.3 by Hellige-Truog; NaF pH 11.0; clear smooth boundary.
2Bwb3--24 to 31 inches (60 to 78 cm); light yellowish brown (10YR 6/4) extremely gravelly medial sandy loam, dark yellowish brown (10YR 3/4) moist; 3 percent clay; single grain; loose, loose, nonsticky, nonplastic; common fine and few medium roots; many very fine and fine irregular pores; 15 percent angular fine gravel and 50 percent angular medium and coarse gravel; slightly acid, pH 6.3 by Hellige-Truog; NaF pH 11.3; abrupt irregular boundary. (Combined thickness of the 2Bwb horizon is 12 to 26 inches (30 to 66 cm) thick)
2R--31 inches (78 cm); indurated andesite bedrock
TYPE LOCATION: Shasta County, California, about 0.75 miles east of the base of Hat Mountain, approximately 1400 feet south and 1300 feet east of the northwest corner of sec 35, T. 31 N, R. 5 E, 40 degrees, 30 minutes, 30 seconds north latitude and 121 degrees, 23 minutes, 41 seconds west longitude, NAD83; USGS Quad: West Prospect Peak, California.
RANGE IN CHARACTERISTICS:
Depth to restrictive feature: Lithic contact 20 to 40 inches (51 to 102 cm).
Mean annual soil temperature: 40 to 45 degrees F (6 to 7 degrees C).
Soil moisture control section is dry: July to October (about 90 days).
Particle-size control section: ashy part, 0 to 2 percent clay, and 5 to 13 percent rock fragments, medial-skeletal part, 3 to 8 percent clay, and 65 to 82 percent rock fragments.
Surface fragments: 5 to 45 percent gravel, 0 to 5 percent cobbles, 3 to 10 percent stones, and 3 to 10 percent boulders.
A horizon:
Color dry: 10YR 4/1, 4/2, 5/3, 2.5Y 4/1, 4/2
Color moist: 10YR 3/1, 3/2, 2.5Y 2.5/1, 3/1, 3/2
Texture: ashy sand, ashy loamy sand, gravelly ashy loamy sand
Clay content: 1 to 3 percent
Rock fragments: 5 to 13 percent fine gravel, 2 to 9 percent medium and coarse gravel, 7 to 22 percent total gravel, 0 to 10 percent cobbles, 7 to 32 percent total rock fragments
Organic matter: 4 to 10 percent
Acid oxalate extractable Al plus 1/2 Fe: 0.40 to 0.71
P retention: 25 to 55 percent
Glass content: 30 to 60 percent
NaF pH: 9.0 to 10.2
Soil reaction: slightly acid or neutral
C horizon:
Color dry: 10YR 7/2, 8/1
Color moist: 10YR 5/2, 5/3
Texture: ashy sand, very cobbly ashy loamy sand, extremely cobbly ashy coarse sand
Clay content: 0 to 2 percent
Rock fragments: 3 to 16 percent fine gravel, 2 to 10 percent medium and coarse gravel, 5 to 26 percent total gravel, 0 to 30 percent cobbles, 0 to 10 percent stones, 5 to 61 percent total rock fragments
Organic matter: 0.5 to 3 percent
Acid oxalate extractable Al plus 1/2 Fe: 0.18 to 0.30
P retention: 10 to 20 percent
Glass content: 55 to 65 percent
NaF pH: 9.3 to 11.1
Soil reaction: slightly acid or neutral
Upper 2Bwb horizon:
Color dry: 10YR 5/4, 6/3, 6/4, 2.5Y 6/3, 6/4
Color moist: 10YR 3/4, 4/3, 4/4, 2.5Y 4/4
Texture: very gravelly medial sandy loam, extremely gravelly medial sandy loam, very cobbly medial sandy loam, extremely cobbly medial sandy loam, very stony medial sandy loam, extremely stony medial sandy loam
Clay content: 3 to 8 percent
Rock fragments: 5 to 25 percent fine gravel, 5 to 50 percent medium and coarse gravel, 10 to 65 percent total gravel, 0 to 40 percent cobbles, 0 to 20 percent stones, 0 to 10 percent boulders, 41 to 85 percent total rock fragments
Organic matter: 2.5 to 5.0 percent
Acid oxalate extractable Al plus 1/2 Fe: 2.35 to 3.11
P retention: 91 to 100 percent
Glass content: 36 to 45 percent
NaF pH: 10.5 to 11.5
Soil reaction: slightly acid or neutral
Lower 2Bwb horizon:
Color dry: 10YR 5/4, 6/3, 6/4, 2.5Y 6/3, 6/4
Color moist: 10YR 4/3, 4/4, 2.5Y 4/4
Texture: very gravelly medial sandy loam, extremely gravelly medial sandy loam, very cobbly medial sandy loam, extremely cobbly medial sandy loam
Clay content: 3 to 8 percent
Rock fragments: 10 to 25 percent fine gravel, 15 to 55 percent medium and coarse gravel, 30 to 75 percent total gravel, 0 to 40 percent cobbles, 0 to 10 percent stones, 0 to 12 percent boulders, 45 to 85 percent total rock fragments
Organic matter: 1.2 to 2.5 percent
Acid oxalate extractable Al plus 1/2 Fe: 0.93 to 3.11
P retention: 55 to 100 percent
Glass content: 36 to 45 percent
NaF pH: 10.5 to 11.5
Soil reaction: slightly acid or neutral
COMPETING SERIES: There are no other series in this family.
GEOGRAPHIC SETTING: Cenplat soils are on glacially scoured lava plateaus in the Southern Cascade mountains. Slopes are 0 to 60 percent. These soils formed in tephra over residuum weathered from glacially scoured volcanic rock. Elevation is 6078 to 7364 feet (1853 to 2245 m). Mean annual precipitation is 35 to 65 inches (889 to 1651 mm). The mean annual temperature is 41 to 43 degrees F (5 to 6 degrees C). Frost free season is 60 to 85 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Ashbutte and Badgerflat soils. The Ashbutte soils are very deep, and are on cinder cone volcanoes, some of which were the source of the lava flows that formed the Central Plateau. The Badgerflat soils are moderately deep to dense till, and are on plateau backslopes and ground moraines.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained; saturated hydraulic conductivity is high to very high in the A and C horizons and high in the 2Bwb horizons.
USE AND VEGETATION: This soil is used for wildlife habitat, recreation, ecosystem management, and watershed. Vegetation is California red fir, western white pine, and pinemat manzanita.
DISTRIBUTION AND EXTENT: The soils are inextensive and are mapped in MLRA: 22B, Southern Cascade mountains
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: 2009 Shasta County, California. Source of name is coined from condensing the name of the Central Plateau.
REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon: 0 to 2 inches, (1 to 6 cm)
Cambic horizon: 8 to 31 inches, (21 to 78 cm)
Andic soil properties: 0 to 2 inches (1 to 6 cm) and 5 to 31 inches, (13 to 78 cm)
Lithic contact: 31 inches, (78 cm)
Particle-size control section: 0.4 to 31 inches, (1 to 78 cm)
Soil moisture control section: 26 to 31 inches (66 to 78 cm)
ADDITIONAL DATA: Classification and properties inferred from lab data from lab pedon numbers 08N0098 and 08N0100, NSSL, Lincoln, NE. NASIS User Pedon ID in Davis, MLRA Office: 789187.