LOCATION KARLUK                  AK

Established Series
Rev. SR/DLM
05/2022

KARLUK SERIES

Depth class: very deep
Drainage class: poorly drained
Parent material: ash influenced loess over fine-silty diatomaceous earth
Landform: bogs on stream terraces
Slopes: 0 to 4 percent
Mean annual precipitation: about 16 inches
Mean annual temperature: about 35 degrees F.

TAXONOMIC CLASS: Fine-silty, siliceous, semiactive, acid Humic Cryaquepts

TYPICAL PEDON: Karluk silt loam - on a slope of 2 percent under grass and shrub vegetation at 138 feet elevation. (All colors are for moist soil unless noted)

Oa--0 to 3 inches; very dark grayish brown (10YR 3/2) highly decomposed plant material; many very fine, fine, and medium roots; very strongly acid (pH 4.6); abrupt smooth boundary. (1 to 5 inches thick)

A--3 to 10 inches; very dark grayish brown (10YR 3/2) silt loam; moderate medium granular structure; very friable, slightly sticky and slightly plastic; many very fine, fine, and medium roots few fine distinct dark yellowish brown (10YR 4/4) redoximorphic concentrations; very strongly acid (pH 5.0); clear smooth boundary. (8 to 12 inches thick)

Cg1--10 to 13 inches; light brownish gray (2.5Y 6/2) silt loam; massive; friable sticky and plastic: common very fine, fine, and medium roots; common fine and medium distinct dark yellowish brown (10YR 4/4) redoximorphic concentrations; very strongly acid (pH 5.0); clear smooth boundary. (2 to 6 inches thick)

Ab--13 to 17 inches; inches; very dark grayish brown (10YR 3/2) silt loam; weak fine granular structure; very friable, slightly sticky and slightly plastic; common very fine, fine, and medium roots few fine distinct dark yellowish brown (10YR 4/4) redoximorphic concentrations; very strongly acid (pH 5.0); clear smooth boundary. (0 to 5 inches thick)

2Cg2--17 to 60 inches; light brownish gray (2.5Y 6/2) silt loam; massive; friable sticky and plastic: few very fine and fine roots; many fine and medium distinct dark yellowish brown (10YR 4/4) redoximorphic concentrations; very strongly acid (pH 5.0).

TYPE LOCATION: Western Kenai Peninsula Area, Alaska; about1/4 mile south of Salamatof Creek; in the NW 1/4 of the SW 1/4, section 11, T. 11 N., R. 12 W; Kenai C4 SW 1:25,000 quad; Seward Meridian; UTM north 6721675 and UTM east 591192, zone 5.

RANGE IN CHARACTERISTICS:

Particle-size control (section weighted average):
Percent clay in the control section: 18 to 25 percent

Soil moisture regime: Aquic
Mean annual soil temperature: 35 degrees F
Thickness of Umbric epipedon: 8 to 12 inches
Thickness of ash influenced loess: 10 to 20 inches

A or Ab horizons:
Matrix color: value of 2 or 3; chroma of 1 to 3
Redoximorphic Concentrations: hue of 7.5YR or 10YR; value of 4 or 5; chroma of 4 to 6
Reaction class: very strongly acid to medium acid

C horizon:
Matrix color: hue of 10YR or 2.5Y; value of 4 to 6; chroma of 1 or 2
Redoximorphic Concentrations: hue of 7.5YR or 10YR; value of 4 or 5; chroma of 4 to 6
Reaction class: very strongly acid to moderately acid

COMPETING SERIES: There are no competing series in this classification.

GEOGRAPHIC SETTING:
Drainage class: poorly drained
Parent material: ash influenced loess over fine-silty diatomaceous earth
Landform: bogs on stream terraces
Slopes: 0 to 4 percent
Mean annual temperature: about 35 degrees F.
Mean annual precipitation: about 16 inches

GEOGRAPHICALLY ASSOCIATED SOILS: These include Soldotna and Salamatof soils. Soldotna soils are well drained and occur on moraines. Salamatof soils are very poorly drained organic soils that occur on similar landforms.

DRAINAGE AND PERMEABILITY: Poorly drained, very high runoff, saturated hydraulic conductivity is moderately high or high.

USE AND VEGETATION: Used for wildlife habitat and recreation. The native vegetation is grasses, forbs, and shrubs.

DISTRIBUTION AND EXTENT: MLRA 224 Cook Inlet Lowlands, South-central Alaska, The series is of small extent.

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: WASILLA, ALASKA

SERIES ESTABLISHED: Area, Alaska, 1960

REMARKS: Diagnostic features and horizons recognized in this profile include:
Umbric epipedon: from 3 to 10 inches.
Particle size control section: fine-silty
Redoximorphic features: from 3 to 60 inches.
Temperature regime: cryic
Moisture regime: udic

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National Cooperative Soil Survey
U.S.A.