LOCATION TISHTANG CA

Established Series
REV: BAL/JPS/ET
01/2013

TISHTANG SERIES

The Tishtang series consists of very deep, well drained soils formed in residuum derived from diorite. These soils are on mountains and have slopes of 9 to 25 percent. Mean annual precipitation is 2540 millimeters (100 inches) and the mean annual temperature is 7 degrees C (44 degrees F).

TAXONOMIC CLASS: Fine-loamy, mixed, active, frigid Xeric Haplohumults

TYPICAL PEDON: Tishtang sandy loam - under a stand of white fir, Douglas-fir, and snowberry. When described on June 19, 2002 the soil was dry throughout. (Colors are for dry soil unless otherwise stated).

Oi--0 to 2 centimeters (0 to 1 inch); slightly decomposed plant material; abrupt smooth boundary.

A--2 to 12 centimeters (1 to 5 inches); brown (7.5YR 4/4), sandy loam, very dark brown (7.5YR 2.5/3), moist; moderate fine granular structure; soft, very friable, nonsticky and nonplastic; many very fine, common fine and medium roots; many very fine and fine tubular, and common medium tubular pores; 5 percent cobbles; strongly acid (pH 5.4); clear smooth boundary. (5 to 15 centimeters thick)

Bt1--12 to 37 centimeters (5 to 15 inches); strong brown (7.5YR 4/6), clay loam, yellowish red (5YR 4/6), moist; strong fine subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; common very fine, fine and medium, and few coarse roots; common very fine, fine and medium tubular pores; few faint clay films on all faces of peds; 2 percent cobbles, 1 percent stones; strongly acid (pH 5.5); gradual smooth boundary.

Bt2--37 to 66 centimeters (15 to 26 inches); brownish yellow (10YR 6/6), extremely paragravelly clay loam, strong brown (7.5YR 5/6), moist; moderate fine subangular blocky structure; slightly hard, very friable, moderately sticky and moderately plastic; common very fine, fine, and medium, and few coarse roots; few very fine, fine, and medium tubular pores; few patchy faint clay films on all faces of peds; 2 percent medium manganese coatings between peds; 3 percent gravel, 2 percent cobble, 1 percent stones; strongly acid (pH 5.4); gradual smooth boundary.

Bt3--66 to 118 centimeters (26 to 46 inches); brownish yellow (10YR 6/6), extremely paragravelly clay loam, yellowish brown (10YR 5/6), moist; weak fine subangular blocky structure; slightly hard, very friable, moderately sticky and moderately plastic; few fine, medium, and coarse roots; few very fine, fine and medium tubular pores; few faint clay films on all faces of peds; 2 percent medium manganese coatings between peds; 10 percent gravel, 2 percent cobbles, 1 percent stones; strongly acid (pH 5.4); gradual smooth boundary. (combined thickness of Bt horizons are 80 to 120 centimeters)

C--118 to 180 centimeters (46 to 71 inches); brownish yellow (10YR 6/6), extremely paragravelly loam, yellowish brown (10YR 5/6), moist; massive; slightly hard, friable, slightly sticky and slightly plastic; few medium and coarse roots; few medium tubular pores; 2 percent medium manganese coatings between peds; 5 percent gravel; strongly acid (pH 5.4). (50 to 100 centimeters thick)

TYPE LOCATION: Humboldt County, California; USGS Hoopa, California topographic quadrangle; 41 degrees 5 minutes 31.20 seconds north latitude and 123 degrees 33 minutes 12.20 seconds west longitude; UTM 453523 meters E, 4549116 meters N, zone 10, NAD83.

RANGE IN CHARACTERISTICS:

Soil moisture: The soil moisture control section is dry from July 1st to October 15th and moist in all parts from November 15 to June 1st. Xeric moisture regime.

Soil temperature: The mean annual soil temperature is 5 to 7 degrees C. The difference between the mean summer and mean winter temperature is greater than 6 degrees C

Base saturation: by sum of cations is less than 35 percent at 162 centimeters

Soil reaction: strongly or moderately acid throughout the soil profile.

Particle Size Control Section (weighted average):

Clay: 28 to 35 percent.
Rock fragments: 0 to 5 percent cobbles and 0 to 5 percent stones
Pararock fragments: 0 to 5 percent paragravel

A Horizon

Hue: 10YR or 7.5YR
Value: 4 through 7 dry, 2 through 5 moist.
Chroma: 3 through 6, dry or moist.

Texture of fine earth fraction: sandy loam
Clay content: 15 to 18 percent.
Rock fragments: 0 to 10 percent cobbles

Upper Bt Horizons

Hue: 5YR, 7.5YR or 10YR
Value: 5 through 7 dry, 4 or 5 moist.
Chroma: 3 through 6, dry or moist.

Texture of fine earth fraction: loam or clay loam
Clay content: 25 to 35 percent.
Rock fragments: 0 to 5 percent cobbles and 0 to 5 percent stones
Pararock fragments: 0 to 5 percent paragravel

Lower Bt Horizons

Hue: 7.5YR or 10YR
Value: 5 through 7 dry, 4 or 5 moist.
Chroma: 3 through 6, dry or moist.

Texture of fine earth fraction: loam or clay loam
Clay content: 25 to 35 percent.
Rock fragments: 0 to 10 percent gravel, 0 to 3 percent cobbles and 0 to 2 percent stones
Pararock fragments: 0 to 5 percent paragravel

C Horizon

Hue: 10YR or 2.5Y
Value: 5 through 7 dry, 4 or 5 moist.
Chroma: 3 through 6, dry or moist.

Texture of fine earth fraction: loam
Clay content: 20 to 25 percent.
Rock fragments: 0 to 10 percent gravel

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

GEOGRAPHIC SETTING: These soils occur on mountain summits and upper slopes with slopes of 9 to 25 percent at elevations of 915 to 1524 meters (3002 to 5000 feet). These soils formed in residuum from diorite. The climate is subhumid with warm dry summers and cold moist winters. The mean annual precipitation is 2032 to 2794 millimeters (80 to 110 inches). Mean annual air temperature is about 7 degrees C (44 degrees F). Mean summer temperature is 9 degrees C (49 degrees F), the mean winter temperature is 2 degrees C (35 degrees F), and the mean annual temperatures ranges from 5 to 8 degrees C (41 to 47 degrees F). The growing season is about 75 to 150 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Darkwoods and Firmountain soils. These soils occur on phyllite at lower elevations.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained; medium runoff; moderately high saturated hydraulic conductivity.

USE AND VEGETATION: Used for timber production, wildlife habitat, and watershed. Native vegetation is white fir, Douglas-fir, incense cedar, with an understory of whitethorn ceanothus, common snowberry, and honeysuckle.

DISTRIBUTION AND EXTENT: Siskyou-Trinity Area, MLRA 5. These soils are of small extent.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California

SERIES ESTABLISHED: Humboldt and Del Norte Area, California, 2012. Proposed 2004.

REMARKS: Diagnostic horizons and features include:

1. Ochric horizon - The zone from 0 to 12 centimeters (Oi & A horizons)
2. Argillic horizon - The zone from 12 to 118 centimeters (Bt1, Bt2, and Bt3 horizons)
3. Particle-size control section - the zone from 11 to 61 centimeters, averages 29 percent clay, by weight, and 5 percent rock fragments, by volume.

Additional data: Nasis user pedon ID: 02CA023605022

Soil classified using the 11th Edition of the Keys to Soil Taxonomy.

National Cooperative Soil Survey
U.S.A.