LOCATION HOCKETT CA

Established Series
CES/JBB
09/2021

HOCKETT SERIES

The Hockett series consists of moderately deep, well drained soils formed in slope alluvium, colluvium, and till over residuum derived from granitic rocks. The Hockett soils are on structural benches in the Sierra Nevada Mountains. Slopes range from 1 to 25 percent. The mean annual precipitation is about 720 mm and the mean annual air temperature is about 4 degrees C.

TAXONOMIC CLASS: Sandy, isotic, frigid Vitrandic Humixerepts

TYPICAL PEDON: Hockett sandy loam on an east facing (80 degree), 7 percent slope under a cover of threadleaf sedge and lodgepole pine at an elevation of 2605 meters. (Colors are for dry soils unless otherwise noted. When described on August 29, 2014 the soil was dry throughout.)

A1--0 to 9 cm; brown (10YR 4/3) sandy loam, very dark brown (10YR 2/2) moist; 69 percent sand; 25 percent silt; 6 percent clay; weak fine granular structure; soft, very friable, slightly sticky, nonplastic; many very and fine roots throughout; many very fine irregular pores; 5 percent subangular strongly cemented granite fine gravel; very strongly acid (pH 4.8); NaF pH 10.1; clear smooth boundary. Lab sample # 15N02489

A2--9 to 21 cm; brown (7.5YR 4/4) gravelly sandy loam, very dark brown (7.5YR 2.5/2) moist; 72 percent sand; 25 percent silt; 3 percent clay; weak medium granular structure; soft, very friable, slightly sticky, nonplastic; many very fine , fine, and medium roots throughout; many very fine irregular pores; 10 percent subangular moderately cemented granite paragravel, 5 percent subrounded indurated granite cobbles; very strongly acid (pH 5.0); NaF pH 11.5; clear smooth boundary. (combined thickness of A horizons is 6 to 25 cm) Lab sample # 15N02490

Bw--21 to 39 cm; dark yellowish brown (10YR 4/6) very cobbly loamy sand, dark brown (7.5YR 3/3) moist; 77 percent sand; 20 percent silt; 3 percent clay; weak medium and fine subangular blocky structure; slightly hard, friable, slightly sticky, nonplastic; common very fine, fine, and medium roots throughout; common very fine and fine dendritic tubular pores; 20 percent subangular strongly cemented granite gravel, 15 percent subrounded indurated granite cobbles, 3 percent subrounded indurated granite stones; moderately acid (pH 5.8); NaF pH 11.7; clear smooth boundary. (15 to 60 cm thick) Lab sample # 15N02491

C1--39 to 55 cm; light yellowish brown (10YR 6/4) very gravelly loamy sand, dark yellowish brown (10YR 4/4) moist; 82 percent sand; 16 percent silt; 2 percent clay; structureless single grain; loose, loose, slightly sticky, nonplastic; few very fine and common fine roots throughout; many fine interstitial pores; 30 percent subrounded indurated granite gravel, 5 percent subrounded indurated granite cobbles; moderately acid (pH 6.0); NaF pH 11.4; clear smooth boundary. Lab sample # 15N02492

C2--55 to 66 cm; light yellowish brown (10YR 6/4) fine sandy loam, dark yellowish brown (10YR 4/4) moist; 69 percent sand; 30 percent silt; 2 percent clay; structureless massive; moderately hard, firm, slightly sticky, nonplastic; few very fine and common fine roots throughout; many very fine irregular pores; 5 percent subrounded moderately cemented granite paragravel; moderately acid (pH 5.8); NaF pH 11.4; abrupt smooth boundary. (combined thickness of C horizons is 0 to 30 cm) Lab sample # 15N02493

R--66 cm; Indurated granite bedrock, fractured at intervals of =>200 cm; common fine medium roots in mat at top of horizon.

TYPE LOCATION: Tulare County, California, approximately 200 m west of middle of South Fork Meadow in Sequoia National Park; USGS 7.5 minute topographic quadrangle: Moses Mountain, California; WGS84 36.346478 latitude and -118.645828 longitude; UTM zone 11 4023637 meters N 352311 meters E NAD83.

RANGE IN CHARACTERISTICS:
Soil temperature: The mean annual soil temperature at 50 cm is 0 to 8 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: 25 to 50 cm
Depth to lithic contact: 50 to 100 cm

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 75 cm from the mineral soil surface

Particle size control section weighted average:
Rock fragments: 15 to 30 percent, with 0 to 30 percent gravel, 0 to 30 percent paragravel, 0 to 15 percent cobbles, and 0 to 15 percent stones
Clay content: 2 to 8 percent
NaF pH: 8.5 to 11.5

A horizon
Hue: 7.5 YR, 10YR
Value: 3 to 5 dry, 2 or 3 moist
Chroma: 2 to 4 dry, 2 or 3 moist
Texture: sandy loam, loamy fine sand, loamy sand, loamy coarse sand
Clay content: 2 to 8 percent
Rock fragments: 0 to 15 percent
0 to 15 percent gravel
0 to 5 percent cobbles
Pararock fragments: 0 to 15 percent paragravel
Reaction: very strongly to moderately acid

Bw horizon(s)
Hue: 7.5YR, 10YR, 2.5Y
Value: 4 to 7 dry, 3 to 5 moist
Chroma: 3 to 6 dry, 2 to 4 moist
Texture: loamy fine sand, loamy sand, loamy coarse sand
Clay content: 2 to 8 percent
Rock fragments: 0 to 40 percent
0 to 30 percent gravel
0 to 15 percent cobbles
0 to 15 percent stones
Pararock fragments: 0 to 30 percent paragravel
Reaction: very strongly to moderately acid

C horizon(s), where present
Hue: 10YR, 2.5Y
Value: 6 or 7 dry, 3 or 4 moist
Chroma: 3 or 4, dry or moist
Texture: fine sandy loam, sandy loam, loamy fine sand, loamy sand
Clay content: 1 to 6 percent
Rock fragments: 0 to 35 percent
0 to 30 percent gravel
0 to 15 percent cobbles
0 to 15 percent stones
Pararock fragments: 0 to 10 percent paragravel
Reaction: strongly to moderately acid

COMPETING SERIES: These are the Packerjohn soils. Packerjohn soils are greater than 150 cm to bedrock, and include a neutral pH and ashy textures.

GEOGRAPHIC SETTING: The Hockett soils are on linear to concave positions of structural benches on mountain slopes, glacial-valley floors, and and plateaus. Slopes range from 1 to 25 percent. These soils formed slope alluvium, colluvium, and till over residuum weathered from granite, granodiorite, and, less commonly, metamorphic rocks. Elevation is 1765 to 3175 meters. The climate is Mediterranean with warm, dry summers and cool, moist winters. The mean annual precipitation is 440 to 1375 mm and the mean annual air temperature is 3 to 9 degrees C. The frost-free season is 60 to 165 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Dorst and Kanawyer soils. Dorst soils are on linear to convex positions on structural benches and are less than 50 cm to bedrock. Kanawyer soils are formed in colluvium and/or till derived from granite, and are on linear to convex positions on moraines and mountain slopes.

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

USE AND VEGETATION: This soil is used for recreation, wildlife habitat, and watershed. Vegetation is threadleaf sedge, lodgepole pine, Jeffrey pine, pinemat manzanita, and greenleaf manzanita.

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: Tulare County, California in Sequoia and Kings Canyon National Parks. Source of name from a meadow in Sequoia National Park.

REMARKS:
Particle Size Control Section for this pedon: 25 to 66 cm
Diagnostic horizons and features recognized in this pedon are:
Umbric Epipedon 0 to 39 cm
Lithic Contact 66 cm

ADDITIONAL DATA:
Pedon information for this type location only:
Pedon Type: OSD pedon Lab Source ID: KSSL
Pedon Purpose: soil survey inventory Lab Pedon #: 15N0490
NASIS User Pedon ID: S2014CA107002
Soil classified using the 12th Edition of the Keys to Soil Taxonomy.

National Cooperative Soil Survey
U.S.A.