LOCATION HOAGLAND CA

Established Series
REV: JWH/JTB/ET/KP
10/2016

HOAGLAND SERIES

The Hoagland series consists of very deep, well drained soils formed in colluvium and residuum derived from sandstone and mudstone. Hoagland soils are on mountains. Slopes range from 15 to 50 percent. Mean annual precipitation is about 2160 millimeters and the mean annual temperature is about 13 degrees C.

TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Typic Humixerepts

TYPICAL PEDON: Hoagland gravelly loam on an east southeast facing 23 percent slope under Douglas-fir and Oregon white oak with a groundcover of western swordfern, at an elevation of 890 meters. (Colors are for dry soil unless otherwise noted.) When described on 07/08/08, the soil was slightly moist below 80 cm.

Oi--0 to 2 cm; slightly decomposed plant material, very dark grayish brown (10YR 3/2) rubbed moist; about 95 percent fiber, 85 percent rubbed; slightly acid, (pH 6.5); abrupt smooth boundary.(0 to 3 cm thick)

A1--2 to 12 cm; brown (10YR 5/3) gravelly loam, very dark brown (10YR 2/2) moist; moderate medium granular structure; moderately hard, friable, slightly sticky and slightly plastic; common fine, medium, and coarse roots throughout; common fine and medium irregular pores; 30 percent gravel and 1 percent cobbles; moderately acid (pH 5.7); abrupt smooth boundary.

A2--12 to 21 cm; brown (10YR 5/3) gravelly loam, very dark brown (10YR 2/2) moist; moderate medium granular structure; slightly hard, very friable, slightly sticky and slightly plastic; common very fine, fine, medium, and coarse roots throughout; common very fine and fine irregular and common medium tubular pores; 18 percent gravel and 1 percent cobbles; strongly acid (pH 5.4); clear smooth boundary.

A3--21 to 38 cm; brown (7.5YR 5/3) gravelly loam, dark brown (10YR 3/3) moist; weak medium granular structure; slightly hard, very friable, slightly sticky and slightly plastic; common very fine, fine, and medium roots throughout; many fine irregular and common medium tubular pores; 16 percent gravel and 1 percent cobbles; strongly acid (pH 5.2); clear wavy boundary. (Combined thickness of the A horizons is 25 to 50 cm)

BA--38 to 60 cm; 40 percent brown (7.5YR 5/3) and 60 percent brown (7.5YR 5/4) gravelly loam, 40 percent dark brown (10YR 3/3) and 60 percent brown (10YR 4/3) moist; moderate medium subangular blocky structure; slightly hard, very friable, slightly sticky and moderately plastic; common very fine, fine, medium, and coarse roots throughout; common very fine and medium tubular pores; 18 percent gravel and 1 percent cobbles; strongly acid (pH 5.3); clear wavy boundary. (0 to 30 cm thick)

Bt1--60 to 93 cm; brown (7.5YR 5/4) gravelly loam, dark yellowish brown (10YR 3/4) moist; weak medium subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; common very fine, fine, medium, and coarse roots throughout; common very fine and fine irregular pores; 5 percent faint clay films on all faces of peds; 16 percent gravel and 1 percent cobbles; strongly acid (pH 5.5); clear wavy boundary.

Bt2--93 to 125 cm; light brown (7.5YR 6/4) gravelly clay loam, dark yellowish brown (10YR 3/6) moist; weak medium subangular blocky structure; moderately hard, very friable, moderately sticky and moderately plastic; common very fine, fine, medium, and coarse roots throughout; 5 percent faint clay films on all faces of peds; 21 percent gravel and 1 percent cobbles; strongly acid (pH 5.5); clear wavy boundary.

Bt3--125 to 180 cm; light brown (7.5YR 6/4) loam, dark yellowish brown (10YR 4/6) moist; weak medium subangular blocky structure; moderately hard, friable, moderately sticky and moderately plastic; common very fine, fine, medium, and coarse roots throughout; 5 percent faint clay films on all faces of peds; 13 percent gravel and 1 percent cobbles; moderately acid (pH 5.6). (Combined thickness of the B horizons is 50 to 150 cm)

TYPE LOCATION: Humboldt County, California, about 4.5 kilometers south of the town of Bridgeville, CA.; USGS Quadrangle Bridgeville, CA; 40.4252778 latitude, -123.8163889 longitude; UTM zone 10 430759mE, 4475265mN, NAD83.

RANGE IN CHARACTERISTICS:

Soil Temperature: The mean annual soil temperature at 50 centimeters is 10 to 14 degrees C. (50 to 58 degrees F.) and the difference between mean summer and mean winter soil temperatures is 6 degrees or more.

Soil Moisture: The soil moisture control section, in normal years, is dry in all parts, for 45 or more consecutive days in the 4 months following the summer solstice and moist in all parts for 45 or more consecutive days in the 4 months following the winter solstice.

Thickness of Umbric Epipedon: 25 to 50 centimeters

Surface Fragments: 0 to 14 percent gravel

Particle size control section weighted average:
Clay content: 20 to 30 percent clay
Rock fragments: 0 to 34 percent gravel, 1 to 5 percent cobbles

Reaction: moderately to strongly acid

A horizon:
Hue: 7.5YR or 10YR
Value: 4 or 5, 2 or 3 moist
Chroma: 2 to 4, dry or moist
Clay content: 18 to 26 percent
Rock fragments: 15 to 34 percent gravel, 0 to 5 percent cobbles

Bt or Bw horizons:
Hue: 7.5YR or 10YR
Value: 5 to 7, 3 to 5 moist
Chroma: 3 to 6, dry or moist
Texture of fine earth: loam or clay loam
Clay content: 20 to 30 percent
Rock fragments: 5 to 34 percent gravel, 0 to 5 percent cobbles

C horizon: (when present)
Hue: 10YR or 2.5Y
Value: 5 to 7, 4 to 6 moist
Chroma: 3 to 6, dry or moist
Texture of fine earth: loam or sandy loam
Clay content: 20 to 30 percent
Rock fragments: 5 to 34 percent gravel, 0 to 5 percent cobbles

COMPETING SERIES: After reclassifying there are no soils in this family. Prior to reclassification competing soils included the Countshill, Culbertson, Dolason, Doty, and Hullt soils. Countshill soils are moderately deep to bedrock. Culbertson soils contain more than a trace of glass and are formed in volcanic ash and loess. Dolason soils have an umbric epipedon greater than 50 cm thick. Doty soils are formed in alluvium on stream terraces. Hullt soils have bedrock above 150 cm.

GEOGRAPHIC SETTING: Hoagland soils are on linear or slightly concave or convex positions on mountain slopes. Slopes are 15 to 50 percent. Elevations range from 450 to 900 meters. These soils formed in residuum and colluvium derived from sandstone and mudstone. The climate is subhumid with warm, dry summers and cool, wet winters. Mean annual precipitation is 1250 to 3050 millimeters and the mean annual temperature is 13 to 15 degrees C. The frost-free period is about 240 to 280 days. These soils are thought to be in areas which were previously grasslands and oak woodlands that have been invaded by Douglas-fir.

GEOGRAPHICALLY ASSOCIATED SOILS: This is the Chalkmountain soil. Chalkmountain soils contrain greater than 35 percent rock fragments and have an umbric epipedon greater than 50 cm thick. Chalkmountain soils are found on similar landscape positions.

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

USE AND VEGETATION: This soil is used mainly for timber production, wildlife habitat, and watershed. Natural vegetation is Douglas-fir, tanoak, California black oak, Oregon white oak, Pacific madrone, California laurel, California huckleberry, and western swordfern.

DISTRIBUTION AND EXTENT: Siskiyou-Trinity Area, MLRA 5. The series is not extensive.

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

SERIES ESTABLISHED: Humboldt County Soil Survey, Southern Part, California 2016. The name is from Hoagland Creek.

REMARKS: Diagnostic horizons and features recognized in this pedon are:
1. Umbric epipedon: The zone from 2 to 38 centimeters. (A1, A2, and A3 horizons)
2. Cambic horizon: The zone from 38 to 180 centimeters. (Bt1, Bt2, Bt3)
3. Particle size control section - The zone from 27 to 102 centimeters, (A3, BA, Bt1, Bt2) averages 26 percent clay, by weight, and 19 percent gravel by volume.

ADDITIONAL DATA: NASIS Pedon User ID: 08CA6011003 NSSL Pedon No. 09N0108

Keys to Soil Taxonomy, 12th edition Previously classified in the 10th edition as Fine-loamy, mixed, superactive, mesic Humic Dystroxerepts

National Cooperative Soil Survey
U.S.A.