LOCATION KONIAG                  AK

Tentative Series
Rev. CAP
04/2024

KONIAG SERIES

Depth class: Very deep
Drainage class: Well drained
Parent material: herbaceous organic material over sandy and loamy volcanic ash over medial silty volcanic ash over gravelly loamy till
Landscape: Islands
Landform: plains and hills
Slopes: 0 to 20 percent
Mean annual precipitation: about 1200 mm (47 in)
Mean annual temperature: about 4 degrees C. (39 F.)

TAXONOMIC CLASS: Medial over loamy-skeletal, amorphic over mixed, superactive Typic Haplocryands

TYPICAL PEDON: Koniag medial silt loam - on a grass herbaceous and shrubby plains at elevation of 145 meters (480 feet). (All colors are for moist soil.)

Oe--0 to 9 centimeters (0 to 4 inches); black (10YR 2/1), dark gray (10YR 4/1), dry; moderately decomposed plant material; weak fine granular structure; soft, very friable, nonsticky, nonplastic; many fine, and common medium and coarse roots throughout; moderately acid (pH 5.7); clear smooth boundary. (2 to 15 cm, 1 to 6 in thick)

A--9 to 19 centimeters (4 to 8 inches); very dark gray (7.5YR 3/1) medial silt loam; moderate fine granular structure; soft, very friable, nonsticky, nonplastic; many fine, and common medium and coarse roots throughout; moderately acid (pH 5.9); clear smooth boundary. (3 to 15 cm, 1 to 6 in thick)

Bw1--19 to 55 centimeters (8 to 22 inches); dark brown (7.5YR 3/4) medial silt loam; weak fine subangular blocky structure; soft, very friable, nonsticky, nonplastic; common fine, medium, and coarse roots throughout; moderately acid (pH 5.6); gradual smooth boundary.

Bw2--55 to 93 centimeters (22 to 37 inches); dark yellowish brown (10YR 4/6) medial silt loam; moderate medium subangular blocky structure; slightly hard, friable, nonsticky, nonplastic; common fine and medium roots throughout; moderately acid (pH 5.6); abrupt wavy boundary. (Combined thickness is 45 to 130 cm, 18 to 51 in thick)

2C--93 to 200 centimeters (37 to 79 inches); gray (2.5Y 5/1) very gravelly sandy loam; massive; slightly hard, very friable, slightly sticky, nonplastic; 45 percent gravel and 5 percent cobble; moderately acid (pH 5.7).

TYPE LOCATION: Kodiak Archipelago Soil Survey Area, Alaska; Latitude 57 degrees 34 minutes 2.00 seconds and Longitude 154 degrees 9 minutes 54.00 seconds west, UTM north 6381127.41 and UTM east 430310.97, zone 5, Datum WGS84.

RANGE IN CHARACTERISTICS:

Soil moisture regime: udic
Mean annual soil temperature: 1.6 to 3.3 degrees C. (34.8 to 37.9 degrees F.)
Thickness of organic material: 2 to 15 cm (1 to 6 in)
Depth to andic properties: 2 to 15 cm (1 to 6 in)
Depth to cambic horizon: 5 to 30 cm (2 to 12 in)
Depth to gravelly till: 50 to 160 cm (20 to 63 in)

Oa, Oe, Oi horizon:
Hue: 7.5YR to 10YR
Value: 2 to 5
Chroma: 1 to 4
Texture: slightly, moderately, or highly decomposed plant material
Organic matter: 60 to 90 percent
Reaction class: extremely acid to moderately acid (pH 3.5 to 6.0)

A horizon:
Hue: 7.5YR to 10YR
Value: 2 to 5
Chroma: 1 to 3
Texture: medial silt loam, silt, loam, and very fine sandy loam or their gravelly analogues
Rock fragments: 0 to 14 percent
Silt: 40 to 90 percent
Clay: 2 to 10 percent
Reaction class: extremely acid to moderately acid (pH 3.5 to 6.0)

Bw horizon:
Hue: 7.5YR to 10YR
Value: 2 to 5
Chroma: 3 to 6
Texture: (medial) silt loam, silt, loam, or very fine sandy loam, or their gravelly analogues
Silt: 40 to 90 percent
Clay: 2 to 12 percent
Rock fragments: 0 to 30 percent
Reaction class: extremely acid to moderately acid (pH 3.5 to 6.0)

2C horizon:
Hue: 7.5YR, 10YR, or 2.5Y
Value: 3 to 6
Chroma: 1 to 4
Texture: sandy loam, fine sandy loam, coarse sandy loam, loamy sand, loamy coarse sand, or their very or extremely gravelly analogues
Sand: 50 to 85 percent
Clay: 2 to 10 percent
Rock fragments: 35 to 80 percent
Reaction Class: extremely acid to slightly acid (pH 3.5 to 6.5)

Some pedons have skeletal outwash substratum at depths greater than 152 cm (60 in).

COMPETING SERIES: There are no competing series.

GEOGRAPHIC SETTING:
Elevation: 5 to 365 meters (15 to 1200 feet)
Parent material: moderately decomposed herbaceous organic material over medial silty volcanic ash over gravelly loamy till
Landform: plains and hills
Slope: 15 to 60 percent
Mean annual temperature: 0 to 6 degrees C. (32 to 43 degrees F.)
Mean annual precipitation: 600 to 2000 mm (23 to 79 in)
Frost free period: 20 to 50 days

GEOGRAPHIC SETTING:
Depth class: very deep
Drainage class: well drained
Parent material: moderately decomposed herbaceous organic material over medial silty volcanic ash over gravelly loamy till
Landform: plains and hills
Slopes: 0 to 30 percent
Mean annual precipitation: 900 to 2000 mm (35 to 79 in)
Mean annual temperature: 0 to 6 degrees C. (32 to 43 degrees F.)
Frost-free season: 20 to 50 days

GEOGRAPHICALLY ASSOCIATED SOILS: These include Akalura, Aleneva, Luchek, Rezanof, Sulua, Terror Lake, Tonki, Tungalara, and Wineskey series.
Aleneva soils have aquic features at depths greater between 41 to 100 cm (16 to 40 in) and occur on drainageways and depressions.
Akalura soils occur on mountain, hill, or ridge on flanks, backslopes, footslopes and toeslopes.
Luchek soils have thick organic material over skeletal glacial till and occur in drainageways and depressions.
Rezanof soils have mollic epipedons and occur on similar landform positions.
Sulua soils have thick organic material over skeletal glacial till and occur on drainageways and depressions.
Terror Lake soils have aquic features at depths greater between 41 to 100 cm (16 to 40 in) and occur on drainageways and depressions.
Tonki soils have aquic features within 0 to 25 cm (0 to 10 in) and occur on drainageways and depressions.
Tungalara soils have skeletal particle-sized control sections and occur on similar positions.
Wineskey soils have aquic features at depths greater between 41 to 100 cm (16 to 40 in) and occur on drainageways and depressions.

DRAINAGE AND PERMEABILITY:
Drainage class: well drained
Saturated Hydraulic Conductivity: very high in the Oe horizon, moderately high to high in the A and Bw horizons, and high or very high in the 2C.
Permeability: rapid or very rapid in the Oe horizon, moderate to rapid in the A and Bw, and moderate to rapid in the 2C horizons.
Runoff: low to medium.

USE AND VEGETATION:
Used for water shed. Native vegetation is Sitka Spruce, Forb meadow and Grass.

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Wasilla, Alaska

DISTRIBUTION AND EXTENT: MLRA 225 Southern Alaska Peninsula Mountains
Extent: moderate.

SERIES ESTABLISHED: Kodiak Archipelago Soil Survey, Alaska, 2024.

REMARKS: Diagnostic features and horizons recognized in this profile include:

Organic material: 0 to 9 cm (0 to 4 in) (moderately decomposed hemic plant material) (Oe horizon)

Andic soil properties: 9 to 93 cm (4 to 37 in) (A, Bw1 horizons)

Cambic horizon: 19 to 93 cm (8 to 37 in) (Bw1, Bw2 horizons)

Lithological discontinuity: 93 to 200 cm (37 to 79 in)

ADDITIONAL DATA:

User pedon Id: 09AO 05701

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National Cooperative Soil Survey
U.S.A.