LOCATION NANNINGCREEK CA

Established Series
Rev. SAA/ET
10/2016

NANNINGCREEK SERIES

The Nanningcreek series consists of very deep, moderately well drained soils formed in colluvium and residuum from sandstone with minor amounts of siltstone and gravelly conglomerate. Nanningcreek soils are on mountains. Slopes range from 15 to 75 percent. The mean annual precipitation is about 1525 millimeters and the mean annual air temperature is about 11 degrees C.

TAXONOMIC CLASS: Fine-loamy, mixed, superactive, isomesic Oxyaquic Hapludalfs

TYPICAL PEDON: Nanningcreek loam on a southwest facing convex slope of 44 percent under coast redwood, tanoak, Pacific madrone, blueblossom, and elderberry at 185 meters elevation. (Colors are for moist soil unless otherwise noted. When described on May 13, 2005, the soil was moist throughout.)

A--0 to 13 centimeters; very dark grayish brown (10YR 3/2) loam, brown (10YR 5/3) dry; weak very fine subangular blocky structure parting to weak fine granular; slightly hard, very friable, nonsticky and nonplastic; many very fine, common fine and medium roots throughout; many very fine and common fine irregular pores; 5 percent gravel, 1 percent charcoal; neutral (pH 6.8); clear smooth boundary. (10 to 25 centimeters thick)

ABt--13 to 26 centimeters; brown (7.5YR 4/3) loam, brown (7.5YR 5/3) dry; moderate fine subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; common very fine, fine, and medium roots throughout; many very fine, and common fine irregular pores; common faint dark brown (7.5YR 3/2) moist, clay films on all faces of peds; moderately acid (pH 5.8); clear wavy boundary. (0 to 25 centimeters thick)

Bt1--26 to 49 centimeters; brown (7.5YR 4/3) loam, brown (10YR 5/3) dry; moderate medium subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; common very fine, fine, and medium roots throughout; common fine and very fine irregular pores; common faint brown (7.5YR 4/2) clay films on all faces of peds; moderately acid (pH 5.8); gradual smooth boundary.

Bt2--49 to 68 centimeters; brown (7.5YR 4/3) fine sandy loam, brown (10YR 5/3) dry; moderate medium subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; common very fine, fine, and medium roots throughout; common very fine and fine irregular pores; common faint brown (7.5YR 4/2) clay films on all faces of peds; 5 percent gravel; moderately acid (pH 5.6); gradual smooth boundary.

Bt3--68 to 90 centimeters; brown (10YR 4/3) fine sandy loam, brown (10YR 5/3) dry; strong medium subangular blocky structure; moderately hard, very friable, slightly sticky and slightly plastic; common very fine, fine, medium, and common coarse roots throughout; common very fine and very fine irregular pores; common distinct brown (7.5YR 4/3) clay films on all faces of peds; 20 percent fine prominent brown (7.5YR 4/4) iron-manganese masses in matrix; 5 percent gravel; moderately acid (pH 5.6); gradual smooth boundary.

Bt4--90 to 138 centimeters; brown (10YR 4/3) fine sandy loam, pale brown (10YR 6/3) dry; strong medium subangular blocky structure; moderately hard, very friable, slightly sticky and slightly plastic; common very fine, fine, and very coarse roots throughout; common very fine and fine irregular pores; common distinct brown (7.5YR 4/3) clay films on all faces of peds; 25 percent fine prominent grayish brown (10YR 5/2) iron depletions in matrix and 30 percent fine prominent brown (7.5YR 4/4) iron-manganese masses in matrix; 5 percent gravel; moderately acid (pH 5.6); gradual smooth boundary. (Combined thickness of the Bt horizons is 100 to 175 centimeters)

Btg--138 to 200 centimeters; grayish brown (10YR 5/2) fine sandy loam, light brownish gray (10YR 6/2) dry; strong medium subangular blocky structure; moderately hard, friable, slightly sticky and slightly plastic; common very fine, fine, and coarse roots throughout; common very fine and fine irregular pores; common distinct brown (10YR 4/3) clay films on all faces of peds; 35 percent medium prominent brown (7.5YR 4/4), iron-manganese masses in matrix; 5 percent gravel; moderately acid (pH 6.0). (Thickness of the Btg horizon is 0 to 75 centimeters)

TYPE LOCATION: Humboldt County, California; About 3.5 kilometers north of Redcrest; USGS Redcrest Quadrangle, CA.; WGS84 Decimal degrees 40.4321944 latitude and -123.9475833 longitude; UTM Zone 10, 419627mE, 4476160mN; NAD83.

RANGE IN CHARACTERISTICS:

Soil moisture: The soil moisture control section is not dry in any part for as long as 90 cumulative days in normal years. The soils have an udic soil moisture regime.

Soil Temperature: The mean annual soil temperature at 50 centimeters is 10 to 13 degrees C. The difference between mean summer and mean winter soil temperature is less than 6 degrees C. The soils have an isomesic temperature regime.

Depth to Redoximorphic Features: 50 to 100 centimeters

Particle size control section (weighted average):
Rock fragments: 0 to 14 percent indurated rounded gravel from conglomerate of mixed sources.
Pararock fragments: 0 to 34 percent very weakly cemented sandstone paragravel
Clay content: 18 to 30 percent

A horizon:
Hue: 10YR
Value: 2 through 4, 4 through 6 dry
Chroma: 1 through 3, moist or dry
Texture of fine earth: loam, fine sandy loam
Rock fragments: 0 to 14 percent gravel
Clay content: 15 to 24 percent
Reaction: slightly acid to neutral

Upper Bt horizons:
Hue: 7.5 YR, 10YR, 2.5Y
Value: 3 through 5, 5 through 7 dry
Chroma: 2 through 4, moist or dry
Texture of fine earth: sandy loam, fine sandy loam, very fine sandy loam, loam, sandy clay loam
Rock fragments: 0 to 14 percent gravel
Pararock fragments: 0 to 34 percent paragravel
Clay content: 18 to 30 percent
Reaction: moderately to slightly acid

Lower Bt horizons:
Hue: 10YR, 2.5Y
Value: 3 through 6, 5 through 7 dry
Chroma: 1 through 3, moist or dry
Texture of fine earth: sandy loam, fine sandy loam, very fine sandy loam, loam, sandy clay loam
Rock fragments: 0 to 14 percent strongly cemented rounded gravel
Pararock fragments: 0 to 59 percent paragravel
Clay content: 14 to 34 percent
Reaction: moderately to slightly acid

Redoximorphic Features: fine and medium iron-manganese masses in the matrix
Quantity: common to many
Hue: 7.5YR, 10YR
Value: 4 or 5
Chroma: 4 through 8

Redoximorphic Features: fine and medium iron depletions in the matrix
Quantity: common to many
Hue: 10YR, 2.5Y
Value: 4 through 6
Chroma: 2

Btg or Cg horizons, when present:

Hue: 10YR, 2.5Y
Value: 3 through 6, 5 through 7 dry
Chroma: 1 through 3, moist or dry
Texture of fine earth: sandy loam, fine sandy loam, very fine sandy loam, loam, sandy clay loam
Rock fragments: 0 to 40 percent strongly cemented rounded gravel
Pararock fragments: 0 to 59 percent paragravel
Clay content: 10 to 30 percent
Reaction: moderately to slightly acid

Redoximorphic Features: fine and medium iron-manganese masses in the matrix
Quantity: none to many
Hue: 7.5YR, 10YR
Value: 4 or 5
Chroma: 4 through 8

Redoximorphic Features: fine and medium iron depletions in the matrix
Quantity: common to many
Hue: 10YR, 2.5Y
Value: 4 through 6
Chroma: 2

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

GEOGRAPHIC SETTING: Nanningcreek soils are on linear to concave backslope positions on mountain slopes. Slopes are 15 to 75 percent. Elevations are 30 to 365 meters. These soils formed in colluvium and residuum from sandstone with minor amounts of siltstone and gravelly conglomerate. The climate is humid with cool foggy summers and cool wet winters. Mean annual precipitation is 1140 to 2160 millimeters. Mean January temperature is about 9 degrees C, mean July temperature is about 14 degrees C, and the mean annual temperature is 10 to 13 degrees C. Frost free season is about 240 to 300 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Fiedler, Oeschger, Petellen, and Scotiabluffs soils. Fiedler and Oeschger soils lack redoximorphic features within 100 centimeters. Petellen soils have greater than 35 percent rock fragments in the particle size control section. Scotiabluffs soils have a paralithic contact between 50 and 100 centimeters. Scotiabluffs soils are on convex positions on ridges and mountain slopes. Oeschger soils are on linear to slightly concave or convex positions and Petellen soils are on linear to convex positions on ridges and mountain slopes

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Moderately well drained, medium to very high runoff, moderately high to high saturated hydraulic conductivity. The soil has a high water table between 50 and 100 centimeters January through April.

USE AND VEGETATION:
This soil is used for timber production, wildlife habitat, watershed, and recreation. Natural vegetation includes redwood, Douglas-fir, Sitka spruce, grand fir, tanoak, red alder, Pacific madrone, California hazel, California huckleberry, salal, thimbleberry, red huckleberry, and western swordfern.

DISTRIBUTION AND EXTENT: Coastal Redwood Belt; MLRA 4B. The series is not extensive.

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

SERIES ESTABLISHED: Humboldt County Soil Survey, Central Part, California, 2010. The name is from Nanning Creek.

REMARKS: Diagnostic horizons and features recognized in this pedon are:
1. Ochric epipedon: The zone from 0 to 13 centimeters (A horizon).
2. Argillic horizon: The zone from 13 to 26 centimeters (ABt horizons).
3. Particle-size control section: The zone from 13 to 26 centimeters (ABt horizons) averages 25 percent clay and 27 percent fine sand or coarser.
4. Oxyaquic feature: The zone from 68 to 200 centimeters (Bt3, Bt4, and Btg horizons)

ADDITIONAL DATA:

Keys to Soil Taxonomy, 12th edition

NASIS User Pedon ID 05CA600019.

National Cooperative Soil Survey
U.S.A.