LOCATION SLANA                   AK

Established Series
Rev. MHC/DLM
02/2022

SLANA SERIES


Depth class: very deep
Drainage class: well drained
Landforms: hills
Parent material: silty eolian deposits over gravelly colluvium
Elevation: 2,789 to 3,107 feet (850 to 947 m)
Slope: 40 to 70 percent
Annual precipitation: 23 to 27 inches (583 to 715 mm)
Annual temperature: 25 degrees F (-4 degrees C)
Frost-free period: 50 to 70 days

TAXONOMIC CLASS:

TYPICAL PEDON: Slana silt loam - on a slope of 25 percent under shrub birch-bog berry scrub. (All colors are for moist soil)

Oi--0 to 4 inches (0 to 10 cm); dark reddish brown (5YR 3/3) slightly decomposed plant material; many very fine, fine, and medium roots; extremely acid (pH 4.4); clear wavy boundary.

A--4 to 6 inches (10 to 15 cm); black (10YR 2/1) silt loam; very friable, nonsticky and nonplastic; many very fine, fine, and medium roots; 2 percent gravel; strongly acid (pH 5.3); abrupt wavy boundary.

2Bs--6 to 11 inches (15 to 28 cm); dark reddish brown (5YR 3/4) very gravelly sandy loam; very friable, nonsticky and nonplastic; common very fine, fine, and medium roots; 30 percent gravel, 5 percent cobbles; moderately acid (pH 5.6); gradual wavy boundary.

2BC--11 to 24 inches (28 to 61 cm); brown (10YR 4/3) very cobbly sandy loam; very friable, nonsticky and nonplastic; common very fine and fine roots; 30 percent gravel, 15 percent cobbles; moderately acid (pH 5.6); gradual wavy boundary.

2C--24 to 60 inches (61 to 152 cm); very dark grayish brown (10YR 3/2) very cobbly sandy loam; very friable, nonsticky and nonplastic; 30 percent gravel, 15 percent cobbles; moderately acid (pH 6.0).

TYPE LOCATION: Delta River Area, Alaska; UTM coordinates: Zone 6, Easting 547940, Northing 6988992.

RANGE IN CHARACTERISTICS:

Soil moisture class: udic
Average annual soil temperature: 32 to 30 degrees F (-0.1 to -1.0 degrees C)
Mean summer soil temperature: 36 to 39 degrees F. (2 to 4 degrees C)
Depth to strongly contrasting textural stratification: 2 to 6 inches (5 to 15 cm)

Oi horizon:
Colorhue of 5YR to 10YR; value of 2.5 or 3; chroma of 2 or 3
Organic matter content65 to 90 percent
Reactionextremely acid to very strongly acid

A horizon:
Colorvalue of 2 or 3; chroma of 1 to 3
Texturesilt loam
Clay content0 to 10 percent
Silt content55 to 75 percent
Sand content15 to 35 percent
Organic matter content3 to 6 percent
Rock fragments0 to 10 percent rounded very strongly cemented gravel; 0 to 5 percent rounded very strongly cemented cobbles
Reactionvery strongly acid or strongly acid

2Bs, 2BC horizon:
Colorhue of 5YR to 10YR; value of 3 or 4; chroma of 3 to 6
Textureextremely cobbly loamy coarse sand, extremely cobbly sandy loam, very gravelly sandy loam
Clay content0 to 10 percent
Silt content10 to 40 percent
Sand content55 to 80 percent
Organic matter content0 to 2 percent
Rock fragments20 to 50 percent rounded very strongly cemented gravel; 5 to 35 percent rounded very strongly cemented cobbles
Reactionstrongly acid or moderately acid

2C horizon:
Colorhue of 10YR or 2.5Y; chroma of 2 to 4
Textureextremely cobbly loamy coarse sand, extremely cobbly sandy loam, very gravelly sandy loam
Clay content0 to 10 percent
Silt content10 to 40 percent
Sand content55 to 80 percent
Rock fragments20 to 50 percent rounded very strongly cemented gravel; 10 to 35 percent rounded very strongly cemented cobbles
Reactionstrongly acid to slightly acid

COMPETING SERIES: These are the McKinley, Pinguk, and Tisuk series. McKinley soils are moderately deep to bedrock series. Pinguk and Tisuk soils have a mean summer soil temperature less than 36 degrees F. (2 degrees C.).

GEOGRAPHIC SETTING:
Landforms: hills
Parent material: silty eolian deposits over gravelly colluvium
Elevation: 2,789 to 3,107 feet (850 to 947 m)
Slope: 40 to 70 percent
Annual precipitation: 23 to 27 inches (583 to 715 mm)
Annual temperature: 25 degrees F (-4 degrees C)
Frost-free period: 50 to 70 days

GEOGRAPHICALLY ASSOCIATED SOILS: These include Geist, and Schleyer soils. Geist soils are somewhat excessively drained, very deep, land occur on hills and outwash plains. Schleyer soils are somewhat excessively drained, very deep, and occur on hills, mountains, outwash plains, and terraces.

DRAINAGE AND PERMEABILITY: Somewhat excessively drained, high runoff. Saturated hydraulic conductivity is moderately high to high.

USE AND VEGETATION: Used for wildlife habitat and recreation. Native vegetation is shrub birch-bog berry scrub.

DISTRIBUTION AND EXTENT: MLRA 228, Interior Alaska Mountains, Alaska. The series is of small extent.

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

SERIES ESTABLISHED: Delta River Area, Alaska, 2005

REMARKS: Diagnostic features and horizons recognized in this profile include:
Spodic horizon: 6 to 11 inches. (2Bs horizon)
Lithologic discontinuity: At the upper boundary of 2Bs horizon
Loamy-skeletal particle size control section: 10 to 40 inches below the mineral soil surface
Temperature regime: cryic

ADDITIONAL DATA:


National Cooperative Soil Survey
U.S.A.