LOCATION MANKER AK
Established Series
SDB
08/2025
MANKER SERIES
Depth class: shallow to permafrost
Drainage class: moderately well drained
Parent material: organic material over silty noncalcareous loess
Landscape: outwash plains and mountains
Landform: bluffs, mountain valleys and terraces
Slope: 5 to 25 percent
Mean annual precipitation: about 550 mm (22 in)
Mean annual air temperature: about -3 degrees C (27 degrees F)
Frost-free period: 32 to 103 days
TAXONOMIC CLASS: Coarse-silty, mixed, active, nonacid, subgelic Folistic Haploturbels
TYPICAL PEDON: Manker slightly decomposed organic material in a white spruce dominated, linear, linear river valley terrace on a slope of 27% at an elevation of 508m (1670 ft)
Oi--0 to 20 cm (0 to 8 in); slightly decomposed plant material, dark brown (7.5YR 3/3) moist; nonsticky, nonplastic; common very fine, fine, medium, and coarse roots throughout; neutral (pH 6.8); clear wavy boundary (15 to 22 cm, 6 to 9 in)
Oe--20 to 26 cm (8 to 10 in); moderately decomposed plant material, black (7.5YR 2.5/1) moist; nonsticky, nonplastic; common very fine, fine, medium, and coarse roots throughout; neutral (pH 7.0); clear wavy boundary (4 to 8 cm, 2 to 3 in)
Oa--26 to 28 cm (10 to 11 in); highly decomposed plant material, black (7.5YR 2.5/1) moist; nonsticky, nonplastic; common very fine, fine, medium, and coarse roots throughout; neutral (pH 7.1); clear wavy boundary (1 to 8 cm, 1 to 3 in)
C/Oajjf--28 to 50 cm (11 to 20 in); silt loam, very dark brown (7.5YR 2.5/2) moist; moderate medium platy structure; very rigid, very rigid, noncoherent, nonsticky, nonplastic; nonsmeary; neutral (pH 7.2); clear wavy boundary (18 to 28 cm, 7 to 11 in)
Cf--50 to 150 cm (20 to 59 in); silt loam, dark gray (2.5Y 4/1) moist; moderate medium platy structure; very rigid, very rigid, noncoherent, nonsticky, nonplastic; nonsmeary; neutral (pH 7.1) (94 to 112 cm, 37 to 44 in)
TYPE LOCATION: Valdez-Cordova Census Area County, Alaska; latitude 61.64796, longitude -145.17168, UTM 6836323.92 north and UTM 596856.32 east, zone 6. Datum WGS84
RANGE IN CHARACTERISTICS:
Soil moisture regime: udic
Soil temperature regime: gelic
Mean annual soil temperature: -4 to 1 degrees C. (25 to 34 degrees F)
Thickness of folistic epipedon: 20 to 38 cm (8 to 15 in)
Depth to cryoturbation: 20 to 30 cm (8 to 12 in)
Depth to permafrost: 38 to 66 cm (15 to 26 in)
Oi, Oe, and Oa horizons:
Hue: 7.5YR or 10YR
Value: 2 to 3
Chroma: 1 to 3
Texture: slightly decomposed organic material, moderately decomposed organic material, and highly decomposed organic material.
Organic matter: 60 to 90 percent
Reaction class: moderately acid to slightly alkaline (pH 6.0 to 7.5)
C/Oajjf horizon:
C material: Hue of 10YR or 2.5Y, value of 3 to 5, chroma of 1 to 3
O material: hue of 7.5YR or 10YR, value of 2 to 3, chroma of 1 to 2
texture: silt loam
sand: 15 to 30 percent
silt: 64 to 82 percent
clay: 3 to 10 percent
texture: highly decomposed organic material
Organic matter: 3 to 8 percent
Reaction class: neutral to slightly alkaline (pH 6.7 to 7.5)
C or Cf horizon:
Hue: 10YR or 2.5Y
Value: 3 to 4
Chroma: 1 to 2
Texture: silt loam
Sand: 15 to 40 percent
Silt: 57 to 82 percent
Clay: 3 to 10 percent
Organic matter: 0.5 to 1.5 percent
Reaction class: neutral to slightly alkaline (pH 6.7 to 7.5)
Some pedons have an A horizon below the organic horizons with a hue of 10YR or 2.5Y, value of 2 to 3, chroma of 1 to 2, and a texture of silt, silt loam, or fine sandy loam.
COMPETING SERIES: These are no competing series.
GEOGRAPHIC SETTING:
Elevation: 200 to 1000 meters (655 to 3280 ft)
Parent material: organic material over silty noncalcareous loess
Landform: bluffs, mountain valleys and terraces
Slopes: 5 to 25 percent
Mean annual precipitation: 300 to 1000 mm (12 to 39 in)
Mean annual air temperature: -5 to -1 degrees C. (23 to 30 degrees F)
Frost-free period: 32 to 103 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Alterationcreek,
Fields,
Haggardcreek, Rocklake, Tiekel, and Uranatina series.
Alterationcreek soils are well drained, have bedrock at a depth between 101 and 154 cm (40 and 61 in), and occur on hillslopes and mountain valleys.
Fields soils are well drained, have umbric epipedons, lithic contacts within 2 m (79 in) of the soil surface, and occur on mountains.
Haggardcreek soils are well drained, has a folistic epipedon, there is bedrock within 2 meters of the soil surface, and occur on hillslopes and mountain slopes.
Rocklake soils are less than 50cm deep to bedrock and occur on occur on escarpments and ridges on mountain sides
Tiekel soils are very poorly drained, have histic epipedons, cobbles and gravels in the O horizons, and occur in outwash plains and lake plains.
Uranatina soils are well drained, have mottles in Bw and C horizons, and occur on outwash plains and glacial lakes.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class: moderately well
Saturated Hydraulic Conductivity: very high in the Oi, Oe, and Oa horizons, low in the C/Oajjf and Cf horizons.
Permeability: very rapid in the Oi, Oe, and Oa horizons, very slow in the C/Oajjf and Cf horizons.
Runoff: very high
USE AND VEGETATION:
Use: wildlife habitat, recreation, and subsistence
Native vegetation: White spruce, bog Labrador tea, moss
DISTRIBUTION AND EXTENT: MLRA 228 Interior Alaska mountains.
Extent: limited
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Wasilla, Alaska
SERIES ESTABLISHED: North Copper River Soil Survey, Alaska, 2024.
REMARKS: Diagnostic features and horizons recognized in this profile include:
Particle-size control section: 53 to 128 cm (21 to 50 in)
Folistic epipedon: 0 to 28 cm (0 to 11 in) (Oi, Oe and Oa horizons)
Cryoturbation: 28 to 38 cm (11 to 15 in) (C/Oajjf horizon)
permafrost: 50 to 150 cm (20 to 59 in) (Cf horizon)
ADDITIONAL DATA:
User pedon Id: 2022AK261112
National Cooperative Soil Survey
U.S.A.