LOCATION SLIKOK                  AK

Established Series
Rev. DBS/SR/DLM
02/2022

SLIKOK SERIES

Depth class: very deep
Drainage class: very poorly drained
Parent material: ash influenced, silty eolian, silty slope alluvium, or alluvial materials over firm alluvium and/or glacial till
Landform: floodplains, depressions on till plains, and alluvial fans
Slopes: 0 to 8 percent
Mean annual precipitation: 16 to 28 inches.
Mean annual temperature: 33 to 36 degrees F.

TAXONOMIC CLASS: Coarse-silty, mixed, superactive, acid Histic Cryaquepts

TYPICAL PEDON: Slikok muck - on a 5 percent slope under forest vegetation. (All colors are for moist soil)

Oe--0 to 2 inches; black (10YR 2/1) mucky peat; few coarse wood fragments; many roots; very strongly acid (pH 5.0); clear smooth boundary. (3 to 6 inches thick)

Oa--2 to 13 inches; black (10YR 2/1) muck; few coarse wood fragments; common roots; thin strata of silty material; strongly acid (pH 5.1); gradual smooth boundary. (5 to 15 inches thick)

A1--13 to 16 inches; dark yellowish brown (10YR 3/4) mucky silt loam; weak fine granular structure; very friable, nonsticky and nonplastic; strongly acid (pH 5.3); gradual smooth boundary.

A2--16 to 19 inches; very dark brown (10YR 2/2) mucky silt loam; weak fine granular structure; very friable, nonsticky and nonplastic; strongly acid (pH 5.3); gradual smooth boundary.

A3--19 to 39 inches; dark brown (10YR 3/3) mucky silt loam; weak fine granular structure; very friable, nonsticky and nonplastic; strongly acid (pH 5.4); gradual smooth boundary. (Combined A horizons: 8 to 26 inches thick)

AC--39 to 54 inches; dark grayish brown (10YR 4/2) mucky silt loam; massive; very friable, nonsticky and nonplastic; strongly acid (pH 5.5); gradual smooth boundary. (12 to 48 inches thick)

2C--54 to 60 inches; grayish brown (10YR 5/2) gravelly silt loam; massive; firm, nonsticky and nonplastic; 20 percent gravel, 5 percent cobble; strongly acid (pH 5.5).

TYPE LOCATION: Yentna Area, Alaska; in the northwest quarter of the southwest quarter of section 7, T.13 N., R.12 W., Seward Meridian.

RANGE IN CHARACTERISTICS:
Organic mat thickness: 8 to 15 inches
Upper part of the A horizon: 8 to 20 percent organic matter, may be part of the histic epipedon
Base saturation (average): less than 50 percent (NH4OAC) in soils profile
Particle size control section: less than 15 percent fine sands or coarser, less than 18 percent clay
Surface cobbles and stones: may occur on the soil surface

O horizon:
Matrix color: value of 2 to4, chroma of 1 to 3
Texture: peat, mucky peat, muck
Reaction class: extremely acid to strongly acid

A horizons:
Matrix color: hue of 5YR to 10YR; value of 1 to 3; chroma of 1 to
Texture: mucky silt loam, silt loam
Organic carbon: 4 to 10 percent

AC horizon
Texture: mucky silt loam, some pedons are stratified with thin lenses of silt loam and sand

2C horizon:
Matrix color: hue of 10YR to 5Y; value of 3 to 5; chroma of 1 to 4
Texture of silt loam, sandy loam, fine sandy loam modified by 10 to 40 percent total coarse fragments; 10 to 40 percent gravel, 0 to 5 percent cobbles

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

GEOGRAPHIC SETTING:
Drainage class: very poorly drained
Parent material: ash influenced, silty eolian, silty slope alluvium, or alluvial materials over firm alluvium and/or glacial till
Landform: floodplains, depressions till plains, and alluvial fans
Slopes: 0 to 8 percent, but are generally less than 2 percent
Mean annual temperature: 33 to 36 degrees F.
Mean annual precipitation: 16 to 28 inches.

GEOGRAPHICALLY ASSOCIATED SOILS:

DRAINAGE AND PERMEABILITY: Very poorly drained, high to very high runoff. Saturated hydraulic conductivity is high to very high in the organic layers, moderately high to high in the solum, and moderately low to moderately high in the substratum. The water table is at or near the surface throughout the year. Flooding ranges from none to frequent.

USE AND VEGETATION: Natural vegetation is forest dominated by black spruce and willows with ground cover of moss, grass, horsetail, and sedges. A few areas are used for hay and pasture.

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

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

SERIES ESTABLISHED: Kenai-Kasilof Area, Alaska, 1960.

REMARKS: Diagnostic horizons and features recognized in this pedon include:
Histic epipedon: from 0 to 15 inches
Coarse-silty particle size: from 0 to 40 inches.
Temperature regime: cryic
Moisture regime: aquic

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National Cooperative Soil Survey
U.S.A.