LOCATION IZHUT AK
Tentative Series
Rev. CAP
04/2024
IZHUT SERIES
Depth class: very deep
Drainage class: somewhat poorly to moderately 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: hills and plains in swales
Slopes: 1 to 25 percent
Mean annual precipitation: about 2000 mm (80 in)
Mean annual temperature: about 4 degrees C. (34 degrees F.)
Frost-free season: 20 to 50 days
TAXONOMIC CLASS: Medial, ferrihydritic Oxyaquic Haplocryods
TYPICAL PEDON: Izhut ashy sandy loam - in a spruce forest at elevation 49 meters (163 feet). (All colors are for moist soil)
Oe--0 to 7 centimeters (0 to 3 inches); black (7.5YR 2.5/1), very dark gray (7.5YR 3/1), dry; moderately decomposed plant material; very friable, soft, nonsticky, nonplastic; many fine, common medium and coarse roots throughout; very strongly acid (pH 4.9); abrupt smooth boundary. (3 to 13 cm, 1 to 5 in thick)
C1--7 to 12 centimeters (3 to 5 inches); 80 percent light gray (10YR 7/2) and 20 percent light yellowish brown (10YR 6/4), very pale brown (10YR 8/2), dry; ashy very fine sandy loam; massive; very friable, soft, nonsticky, nonplastic; common fine roots throughoout; moderately acid (pH 5.8); clear smooth boundary.
C2--12 to 30 centimeters (5 to 12 inches); light brownish gray (2.5Y 6/2) ashy loamy sand; single grain; loose, nonsticky, nonplastic; common fine, medium, and coarse roots throughout; moderately acid (pH 5.9); abrupt smooth boundary. (Combined thickness is 5 to 30 cm, 2 to 12 in thick)
2A--30 to 34 centimeters (12 to 14 inches); dark gray (10YR 4/1) medial silt loam; weak medium subangular blocky structure; very friable, soft, nonsticky, nonplastic; common fine and medium roots throughout; strongly acid (pH 5.4); clear wavy boundary. (2 to 10 cm, 1 to 4 in thick)
2Bhs--34 to 42 centimeters (14 to 17 inches); black (5YR 2.5/1) medial highly organic silt loam; moderate coarse subangular blocky structure; friable, slightly hard, nonsticky, nonplastic; common fine, medium, and coarse roots throughout; 5 percent gravel; strongly acid (pH 5.2); clear smooth boundary. (2 to 20 cm, 1 to 8 in thick)
2Bs--42 to 112 centimeters (17 to 44 inches); medial silt loam; weak medium subangular blocky structure; friable, slightly hard, nonsticky, nonplastic; common fine, medium, and coarse roots throughout; 30 percent gravel; strongly acid (pH 5.4); clear smooth boundary. (41 to 91 cm, 16 to 36 in thick)
3C--112 to 200 centimeters (44 to 79 inches); dark grayish brown (2.5Y 4/2) very gravelly sandy loam; massive; friable, slightly hard, slightly sticky, nonplastic; 50 percent gravel and 5 percent cobbles; strongly acid (pH 5.2).
TYPE LOCATION: Kodiak Archipelago Soil Survey Area, Alaska; Latitude 57 degrees 50 minutes 59.00 seconds and Longitude 152 degrees 25 minutes 19.00 seconds west, UTM north 6412126.07 and UTM east 534311.18, 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: 3 to 13 cm (1 to 5 in)
Thickness of 1912 ash: 5 to 30 cm (2 to 12 in)
Depth to andic properties: 8 to 43 cm (3 to 17 in)
Depth to spodic horizon: 10 to 53 cm (8 to 21 in)
Depth to gravelly till: 53 to 164 cm (21 to 65 in)
Depth to aquic conditions: 41 to 100 cm (16 to 40 in)
Oa, Oe, Oi horizon:
Hue: 7.5YR to 10 YR
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)
C horizon:
Hue: 7.5YR to 10 YR
Value: 2 to 5
Chroma: 1 to 4
Texture: (ashy and glassy) sand, loamy sand, loamy fine sand, very fine sandy loam, sandy loam, or silt loam
Sand: 30 to 90 percent
Clay: 2 to 8 percent
Silt: 10 to 55 percent
Reaction class: extremely acid to moderately acid (pH 3.5 to 6.0)
2A horizon:
Hue: 7.5YR to 10 YR
Value: 2 to 5
Chroma: 1 to 3
Texture: medial silt loam, silt, loam, and very fine sandy loam or their gravelly analogues
Fragments: 0 to 25 percent
Silt: 40 to 90 percent
Clay: 2 to 10 percent
Reaction class: extremely acid to moderately acid
2Bhs or 2Bs horizon:
Hue: 5YR, 7.5YR, or 10YR
Value: 2 or 3
Chroma: 1 to 4
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 34 percent
Reaction Class: extremely acid to moderately acid (pH 3.5 to 6.0)
3C horizon:
Hue: 7.5YR, 10YR, or 2.5Y
Value: 4 to 6
Chroma: 1 to 4
Texture: sandy loam, fine sandy loam, coarse sandy loam, loamy sand, loamy coarse sand, or their gravelly analogues
Sand: 50 to 85 percent
Clay: 2 to 10 percent
Fragments: 0 to 30 percent
Reaction Class: extremely acid to slightly acid (pH 3.5 to 6.5)
Some pedons have a lithic contact at depths greater than 127 cm (50 in).
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING:
Depth class: very deep
Drainage class: somewhat poorly or moderately well drained
Parent material: moderately decomposed herbaceous organic material over sandy and loamy volcanic ash over medial silty volcanic ash over gravelly loamy till
Landform: hills and plains in drainageways and swales
Slopes: 1 to 25 percent
Mean annual precipitation: 1500 to 3000 mm (59 to 118 in)
Mean annual temperature: 0 to 6 degrees C. (32 to 39 degrees F.)
Frost-free season: 20 to 50 days
GEOGRAPHICALLY ASSOCIATED SOILS: These include
Kodiak,
Marka, Missak,
Narrow Cape,
Olds, Sa, and Tonki series.
Kodiak soils lack aquic features within 150 cm (60 in) and occur on higher landform positions.
Marka soils lack aquic features within 100 cm (40 in), have lithic contact within 100 cm (40 in), and occur on higher landform positions.
Missak soils have thick organic horizons greater than 100 cm (40 in), are very poorly drained, have ponded conditions, and occur on lower landform positions.
Narrow Cape soils lack aquic features within 100 cm (40 in), lack spodic horizons, and occur on higher landform positions.
Olds have organic surface horizons greater than 41 cm (16 in) thick, are poorly drained with aquic conditions within 25 cm (10 in), and occur on lower landform positions.
Sa soils have thick organic horizons greater than 100 cm (40 in), are very poorly drained, have ponded conditions, and occur on lower landform positions.
Tonki soils are poorly drained with aquic conditions within 25 cm (10 in) and occur on lower landform positions.
DRAINAGE AND PERMEABILITY:
Drainage class: somewhat poorly and moderately well drained
Saturated Hydraulic Conductivity: moderately high to very high in the C horizon, moderately high to high in the 2A, 2Bhs, and Bs horizons, and high in the 3C.
Permeability: moderate to very rapid in the C horizon, moderate to rapid in the 2A, 2Bhs, 2Bs, and 3C horizons.
Runoff: low to medium.
USE AND VEGETATION:
Used for water shed. Native vegetation is Sitka Spruce, Forb meadow and Grass.
DISTRIBUTION AND EXTENT: MLRA 225 Southern Alaska Peninsula Mountains.
Extent: moderate.
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Wasilla, Alaska
SERIES ESTABLISHED: Kodiak Archipelago Soil Survey, Alaska, 2024.
REMARKS: Diagnostic features and horizons recognized in this profile include:
Organic material: 0 to 7 cm (0 to 3 in) (moderately decomposed hemic plant material) (Oe horizon)
1912 volcanic glass (ashy) material: 7 to 30 cm (3 to 12 in) (C horizon)
Andic soil properties: 30 to 112 cm (12 to 44 in) (2A, 2Bhs, 2Bs horizons)
Spodic horizon: 34 to 112 cm (14 to 44 in) (2Bhs, 2Bs horizons)
Lithological discontinuity: 112 to 200 cm (44 to 79 in)
Aquic conditions: 41 to 100 cm (16 to 40 in)
ADDITIONAL DATA:
User pedon Id: 09AO 00504
National Cooperative Soil Survey
U.S.A.