LOCATION REZANOF                 AK

Tentative Series
Rev. CAP
04/2024

REZANOF SERIES

Depth class: Very deep
Drainage class: Well drained
Parent material: herbaceous organic material over medial silty volcanic ash over gravelly loamy till
Landscape: Islands
Landform: plains and hills
Slopes: 0 to 20 percent
Mean annual precipitation: 600 to 2000 mm (23 to 78 in)
Mean annual temperature: 0 to 6 degrees C. (32 to 43 F.)

TAXONOMIC CLASS: Medial over loamy-skeletal, amorphic over mixed, superactive Andic Haplocryolls

TYPICAL PEDON: Rezanof medial silt loam - on a grass herbaceous and shrubby plains at elevation of 80 meters (275 feet). (All colors are for moist soil.)

Oe--0 to 8 centimeters (0 to 3 inches); very dark brown (7.5YR 2.5/2), brown (7.5YR 4/2), dry; moderately decomposed plant material; soft, very friable, nonsticky, nonplastic; many very fine, fine, and common medium and coarse roots throughout; strongly acid (pH 5.3); clear smooth boundary.

A1--8 to 18 centimeters (3 to 7 inches); very dark brown (7.5YR 2.5/2), brown (7.5YR 4/2), dry; medial silt loam; weak fine granular structure; soft, very friable, nonsticky, nonplastic; many fine, common medium, and common coarse roots throughout; moderately acid (pH 5.6); gradual smooth boundary.

A2--18 to 36 centimeters (7 to 14.2nches); very dark brown (7.5YR 2.5/2), brown (7.5YR 4/2), dry; medial silt loam; weak fine subangular blocky structure; soft, very friable, nonsticky, nonplastic; common (3.0) medium roots throughout and common (5.0) fine roots; fragments; moderately acid, pH 5.7; gradual wavy boundary.

Bw--36 to 94 centimeters (14 to 37 inches); medial silt loam; 50 percent sand; 6 percent clay; moderate medium subangular blocky structure; slightly hard, friable, nonsticky, nonplastic; many fine, common medium, and common coarse roots throughout; 5 percent gravel; moderately acid (pH 5.6); abrupt wavy boundary.

2C--94 to 200 centimeters (37 to 79 inches); dark grayish brown (2.5Y 4/2) very gravelly sandy loam; massive; slightly hard, friable, slightly sticky, nonplastic; 50 percent gravel and 5 percent cobble; very strongly acid (pH 5.0).

TYPE LOCATION: Kodiak Archipelago Soil Survey Area, Alaska; Latitude 57 degrees 23 minutes 38.99 seconds and Longitude 154 degrees 24 minutes 34.00 seconds west, UTM north 6362141.94 and UTM east 415290.08, 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: 0 to 15 cm (0 to 6 in)
Depth to andic properties: 0 to 15 cm (0 to 6 in)
Depth to mollic epipedon: 0 to 15 cm (0 to 6 in)
Depth to cambic horizon: 25 to 41 cm (10 to 16 in)
Depth to gravelly till: 45 to 130 cm (18 to 51 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: 0 to 20 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 subglacial till
Landform: plains and hills
Slopes: 0 to 30 percent
Mean annual precipitation: 700 to 2000 mm (27 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, Alitak, Koniag, Luchek, Sulua, Terror Lake, Tonki, Tungalara, and Wineskey series.
Akalura soils occur on mountain, hill, or ridge on flanks, backslopes, footslopes and toeslopes.
Aleneva soils have aquic features at depths greater between 41 to 100 cm (16 to 40 in) and occur on drainageways and depressions.
Alitak soils have thick organic material and occur in drainageways and depressions.
Koniag soils lack mollic epipedons and occur on similar landform positions.
Luchek soils have thick organic material over skeletal glacial till and occur in drainageways and depressions.
Narrow Cape soils have recent volcanic ash surface horizons 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 or 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 very 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 220 Alexander Archipelago-Gulf of Alaska Coast.
Extent: moderate.

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

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

Organic material: 0 to 8 cm (0 to 3 in) (moderately decomposed hemic plant material) (Oe horizon)

Andic soil properties: 8 to 94 cm (3 to 37 in) (A1, A2 horizons)

Cambic horizon: 36 to 94 cm (14 to 37 in) (Bw horizon)

Lithological discontinuity: 94 to 200 cm (37 to 79 in)

ADDITIONAL DATA:

User pedon Id: 09BL 01801

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National Cooperative Soil Survey
U.S.A.