LOCATION TUOHY CA

Established Series
CES/JBB
09/2021

TUOHY SERIES

The Tuohy series consists of shallow, well drained soils formed in colluvium over residuum derived from granitic rocks. The Tuohy soils are on structural benches and mountain slopes in the Sierra Nevada mountains. Slopes range from 3 to 60 percent. The mean annual precipitation is about 680 mm and the mean annual air temperature is about 5 degrees C.

TAXONOMIC CLASS: Loamy, isotic, frigid Lithic Humixerepts

TYPICAL PEDON: Tuohy sandy loam on a southeast facing (130 degree), 24 percent slope under cover of threadleaf sedge and Parry's rush at an elevation of 2735 meters. (Colors are for dry soils unless otherwise noted. When described on August 12, 2012 the soil was slightly moist throughout.)

A--0 to 5 cm; grayish brown (10YR 5/2) sandy loam, very dark grayish brown (10YR 3/2) moist; 7 percent clay; weak coarse subangular blocky structure; soft, very friable, nonsticky, nonplastic; common very fine and fine roots throughout; common very fine and fine dendritic tubular pores; 6 percent subrounded indurated granite gravel, 5 percent subrounded indurated granite cobbles; NaF pH 9.5; strongly acid (pH 5.4); clear smooth boundary. (5 to 30 cm thick)

Bw1--5 to 20 cm; light olive brown (2.5Y 5/4) cobbly sandy loam, very dark grayish brown (2.5Y 3/2) moist; 9 percent clay; weak medium granular structure; soft, very friable, nonsticky, nonplastic; common very fine and many fine roots throughout; common very fine and fine irregular pores; 10 percent subrounded indurated granite gravel, 7 percent subrounded indurated granite cobbles; NaF pH 10.5; moderately acid (pH 5.6); clear wavy boundary.

Bw2--20 to 39 cm; dark yellowish brown (10YR 4/4) gravelly sandy loam, very dark grayish brown (2.5Y 3/2) moist; 8 percent clay; weak medium subangular blocky structure; soft, very friable, nonsticky, nonplastic; common very fine and fine roots throughout; common very fine, fine, and medium irregular pores; 70 percent distinct dark yellowish brown (10YR 4/4) dry, sand coats on rock fragments; 5 percent subrounded indurated granite fine gravel, 8 percent subrounded indurated granite medium gravel, 5 percent subrounded indurated granite cobbles; NaF pH 10.5; moderately acid (pH 5.6); very abrupt smooth boundary. (combined thickness of Bw horizons is 15 to 35 cm)

R--39 to 200 cm; indurated granite bedrock with fractures 45 to less than 100 cm apart; many very fine and fine, and common medium roots in mat at top of horizon.

TYPE LOCATION: Fresno County, California; about 1.4 km NNW of LeConte Ranger Station, Kings Canyon National Park; USGS 7.5 minute topographic quadrangle: North Palisade, California; WGS84.105553 latitude and -118.600743 longitude; UTM zone 11 4107781 meters N 357764 meters E NAD83.

RANGE IN CHARACTERISTICS:
Soil temperature: The mean annual soil temperature at 50 cm is 4 to 10 degrees C and the difference between mean summer and mean winter soil temperature is greater than 6 degrees C. The soils have a frigid temperature regime.

Soil moisture: The soils have a xeric soil moisture regime. The soil moisture control section is dry in all parts from about August to October (about 90 days).

Diagnostic Feature(s):
Umbric epipedon thickness: 18 to 35 cm
Cambic horizon thickness: 15 to 32 cm
Depth to lithic contact: 25 to 50 cm

Reaction: very strongly to moderately acid

Base saturation: less than 50 percent. (By ammonium acetate)

Acid-oxalate extractable Al plus 1/2 Fe: 0.4 to 2.0 percent (by weight) in an 18 cm thick layer within a depth of 75 cm from the mineral soil surface

Volcanic glass: 5 to 30 percent in the 0.02 to 2.0 mm fraction in an 18 cm thick layer within a depth of 75cm from the mineral soil surface

Particle size control section weighted average:
Rock fragments: 5 to 30 percent, with 5 to 30 percent gravel, 0 to 15 percent cobbles, and 0 to 5 percent stones.
Clay content: 6 to 15 percent
NaF pH: 8.5 to 11.0

A horizon (s)
Hue: 10YR
Value: 3 to 5 dry, 2 or 3 moist
Chroma: 2 or 3 dry, 1 to 3 moist
Texture: fine sandy loam, sandy loam
Clay content: 5 to 10 percent
Rock fragments: 5 to 30 percent
5 to 30 percent gravel
0 to 15 percent cobbles
0 to 5 percent stones

Bw horizon (s)
Hue: 2.5YR, 10YR
Value: 4 or 5 dry, 3 or 4 moist
Chroma: 2 to 4 dry, 1 to 3 moist
Texture: loam, fine sandy loam, sandy loam
Clay content: 6 to 15 percent
Rock fragments: 10 to 35 percent
10 to 30 percent gravel
0 to 15 percent cobbles
0 to 5 percent stones

COMPETING SERIES: There are no other series in this family at this time.

GEOGRAPHIC SETTING: The Tuohy soils are on linear to convex backslopes of structural benches on mountain slopes, glacial-valley walls, and glacial-valley floors. Slopes range from 3 to 60 percent. These soils formed in colluvium over residuum derived from granitic rock. Elevation is 1900 to 3245 meters. The climate is Mediterranean with warm, dry summers and cool, moist winters. The mean annual precipitation is 425 to 1410 mm and the mean annual air temperature is 2 to 8 degrees C. The frost free season is 60 to 165 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Lackey and Pigchute soils. The Lackey soils are on linear backslopes of mountain slopes, are sandy-skeletal, and are greater than 200 cm to a lithic contact. The Pigchute soils are on linear backslopes of mountain slopes, are loamy-skeletal, and are greater than 200 cm to a lithic contact.

DRAINAGE AND PERMEABILITY: Well drained, moderately high to high saturated hydraulic conductivity in the soil profile. Saturated hydraulic conductivity of the bedrock is low to very high.

USE AND VEGETATION: This soil is used for recreation, wildlife habitat, and watershed. Vegetation is threadleaf sedge, Parry's rush, Sierra juniper, mountain big sagebrush, oceanspray, and lodgepole pine.

DISTRIBUTION AND EXTENT: Sierra Nevada Mountains of California; MLRA 22A. These soils are not extensive.

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Davis, California

SERIES PROPOSED: Fresno County, California in Sequoia and Kings Canyon National Parks. Source of name from a creek in Sequoia National Park.

REMARKS:
Particle Size Control Section for this pedon: 25 to 39 cm
Diagnostic horizons and features recognized in this pedon are:
Umbric Epipedon 0 to 20 cm
Cambic Horizon 20 to 39 cm
Lithic Contact 39 cm

ADDITIONAL DATA:
Pedon information for this type location only:
NASIS User Pedon ID: 2012CA7928008

Soil classified using the 12th Edition of the Keys to Soil Taxonomy.

National Cooperative Soil Survey
U.S.A.