LOCATION TITLOW CA
Established Series
REV: BAL/JPS/ET
01/2013
TITLOW SERIES
The Titlow series consists of deep, well drained soils formed in residuum and colluvium derived from schist. These soils are on mountains and have slopes of 9 to 50 percent. Mean annual precipitation is 2540 millimeters (100 inches) and the mean annual temperature is 12 degrees C (54 degrees F).
TAXONOMIC CLASS: Coarse-loamy, mixed, active, mesic Pachic Humixerepts
TYPICAL PEDON: Titlow loam, under a stand of bristly dogtail grass, blue wildrye, soft brome, and orchard grass. When described on September 8, 2005, the soil was dry throughout. (Colors are for dry soil unless otherwise stated).
A1--0 to 9 centimeters (0 to 4 inches); brown (10YR 4/3) loam, very dark brown (10YR 2/2) moist; moderate very fine granular structure; slightly hard, very friable, nonsticky and nonplastic; many very fine, and fine, and common medium roots; many very fine and fine, and common medium tubular pores; 10 percent gravel; very strongly acid (pH 4.8); abrupt smooth boundary.
A2--9 to 27 centimeters (4 to 11 inches); brown (10YR 4/3) loam, very dark brown (10YR 2/2) moist; moderate fine subangular blocky structure; slightly hard, very friable, nonsticky and nonplastic; many very fine and fine roots; many very fine and fine, and common medium and coarse tubular pores; 10 percent gravel; very strongly acid (pH 4.8); clear wavy boundary. (Combined thickness of A horizons is 25 to 45 centimeters)
Bw1--27 to 71 centimeters (11 to 28 inches); dark yellowish brown (10YR 4/4) loam, dark brown (10YR 3/3) moist; strong fine and medium subangular blocky structure; soft, very friable, nonsticky and nonplastic; common very fine and roots; common very fine and fine tubular pores; 5 percent gravel; very strongly acid (pH 4.8); clear wavy boundary.
Bw2--71 to 110 centimeters (28 to 43 inches); dark yellowish brown (10YR 4/4) loam, very dark brown (10YR 2/2) moist; weak fine and medium subangular blocky structure; soft, very friable, nonsticky and nonplastic; many very fine, and common fine roots; many very fine tubular pores; 5 percent gravel, 5 percent cobbles; very strongly acid (pH 4.6); abrupt smooth boundary. (Combined thickness of Bw horizons is 30 to 75 centimeters)
R--110 centimeters (43 inches); strongly cemented mica schist with fractures greater than 10 centimeters apart.
TYPE LOCATION: Humboldt County, California; Titlow Ridge; USGS Maple Creek topographic quadrangle; 40 degrees 51 minutes 19.6 seconds north latitude and 123 degrees 50 minutes 46.30 seconds west longitude; UTM zone 10, 428677mE, 4523057mN, NAD83.
RANGE IN CHARACTERISTICS:
Depth to schist bedrock: 100 to 155 centimeters (40 to 61 inches)
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. This soil has a xeric soil moisture regime.
Soil temperature: The mean annual soil temperature is 10 to 15 degrees C (50 to 59 degrees F). The difference between the mean summer and mean winter temperature is greater than 6 degrees C. This soil has a mesic soil temperature regime.
Soil reaction: very strongly acid to strongly acid
Base saturation (by ammonium acetate) is less than 60 percent between 25 and 75 centimeters.
Surface Fragments: 0 to 10 percent gravel
Particle Size Control Section (weighted average):
Clay content: 10 to 18 percent.
Coarse fragments: 0 to 15 percent gravel.
A Horizons
Hue: 10YR or 2.5Y
Value: 3 through 5 dry; 2 or 3 moist.
Chroma: 2 or 3 dry, 1 through 3 moist.
Texture of fine earth: loam
Clay content: 10 to 18 percent
Rock fragments: 5 to 15 percent gravel
Bw Horizons
Hue: 10YR or 2.5Y
Value: 3 through 5 dry, 2 or 3 moist.
Chroma: 1 through 4, dry or moist.
Texture of fine earth fraction: loam
Clay content: 10 to 18 percent
Rock fragments: 0 to 15 percent gravel and 0 to 10 cobbles
COMPETING SERIES: There are no other series in this family.
GEOGRAPHIC SETTING: These soils occur on mountain summits and upper mountain slopes. They have slopes of 9 to 50 percent. Elevations are 800 to 1646 meters (2625 to 5400 feet). These soils formed in residuum and colluvium derived from schist. 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 January temperature is about 5 degrees C (41 degrees F); mean July temperature is about 18 degrees C (64 degrees F); and the mean annual temperature is 10 to 15 degrees C (50 to 59 degrees F). The frost free period is about 75 to 150 days.
GEOGRAPHICALLY ASSOCIATED SOILS: This is the
Kinseyridge soil. The Kinseyridge soil is on concave and linear positions and is very deep.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well-drained; medium runoff; moderately high saturated hydraulic conductivity.
USE AND VEGETATION: Used for grazing, watershed protection and wildlife habitat. Native vegetation is bristly dogtail grass, soft brome, blue wildrye, and orchardgrass. Douglas-fir readily invades in the absence of fire.
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 County, California, 2012. Proposed 2005.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
1. Umbric epipedon - the zone from 0 to 110 centimeters (A1, A2, Bw1, and Bw2 horizons)
2. Particle-size control section - the zone from 25 to 100 centimeters, averages 13 percent clay, by weight, and 7 percent rock fragments, by volume.
Soil classified using the 11th Edition of the Keys to Soil Taxonomy. In 2012 the classification was changed from Humic Dystroxerepts to Pachic Humixerepts to reflect changes in Soil Taxonomy.
Nasis User Pedon ID: 05CA023605027
National Cooperative Soil Survey
U.S.A.