LOCATION LUCHEK                  AK

Established Series
Rev CAP
06/2025

LUCHEK SERIES

Depth class: very deep
Drainage class: very poorly drained
Parent material: herbaceous organic material over gravelly loamy till
Landscape: Islands
Landform: hills and plains in depressions, drainageways, and swales
Slopes: 0 to 7 percent
Mean annual precipitation: about 1100 mm (43 in)
Mean annual temperature: about 4 degrees C. (39 degrees F.)
Frost-free season: 20 to 50 days

TAXONOMIC CLASS: Loamy-skeletal, mixed, euic Terric Cryohemists

TYPICAL PEDON: Luchek mucky peat - grass herbaceous depression at elevation 200 meters (665 feet). (All colors are for moist soil.)

Oe1--0 to 13 centimeters (0 to 5 inches); black (10YR 2/1), dark gray (10YR 4/1), dry; mucky peat; soft, very friable, nonsticky, nonplastic; many very fine, fine, and common medium roots throughout; slightly acid (pH 6.2); clear smooth boundary.

Oe2--13 to 39 centimeters (5 to 15 inches); mucky peat; soft, very friable, nonsticky, nonplastic; common very fine, fine, and common medium roots throughout; slightly acid (pH 6.3); gradual smooth boundary.

Oe3--39 to 155 centimeters (15 to 61 inches); mucky peat; soft, very friable, nonsticky, nonplastic; common fine roots throughout; slightly acid (pH 6.4); abrupt wavy boundary.

2C--155 to 200 centimeters (61 to 79 inches); black (7.5YR 2.5/1) very gravelly sandy loam; weak fine angular blocky structure; slightly hard, friable, slightly sticky, nonplastic; 50 percent gravel and 5 percent cobble; slightly acid (pH 6.2).

TYPE LOCATION: Kodiak Archipelago Soil Survey Area, Alaska; Latitude 57 degrees 17 minutes 50.00 seconds and Longitude 153 degrees 56 minutes 48.00 seconds west, UTM north 6350868.76 and UTM east 442952.33, 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 hemic organic material: 90 to 175 cm (35 to 69 in)
Depth to gravelly till: 90 to 175 cm (35 to 69 in)
Depth to aquic conditions: 0 to 25 cm ( 0 to 10 in)

Oa, Oi horizon, (where present at the surface):
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)

Oe 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)

Oa, Oi horizons, where present:
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)

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 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 medial silt loam horizons above the loamy-skeletal till substratum and/or sandy-skeletal outwash substratum.

COMPETING SERIES: These are no competing series.

GEOGRAPHIC SETTING:
Elevation: 5 to 365 meters (15 to 1205 feet)
Parent material: mucky peat herbaceous organic material over gravelly loamy till
Landform: plains and hills in depressions, drainageways, and swales
Slope: 0 to 7 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

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Akalura, Aleneva, Alitak, Koniag, Olds, Rezanof, Pasagshak, Salonie, Sulua, Terror Lake, Tonki, Tungalara, Wineskey, and Yukuk series.
Akalura soils lack thick organic horizons, have cambic horizons, lack aquic conditions within 150 cm (60 in), and occur on upland landform positions.
Aleneva soils lack thick organic horizons, have cambic horizons, lack aquic conditions within 41 cm (16 in), have sandy-skeletal till or outwash substratum, and occur on upland landform positions.
Alitak soils lack gravelly till or outwash substratum and occur on similar landform positions.
Koniag soils lack thick organic horizons, have cambic horizons, lack aquic conditions within 150 cm (60 in), and occur on upland landform positions.
Olds soils have histic epipedons over medial volcanic materials and skeletal till and occur in upland landform positions.
Rezanof soils lack thick organic horizons, have mollic epipedons, have cambic horizons, lack aquic conditions within 150 cm (60 in), and occur on upland landform positions.
Pasagshak soils lack thick organic horizons, have sandy-skeletal control sections, lack aquic conditions less than 41 cm (16 in), and occur on slightly higher flood plains and drainageways.
Sulua soils have sapric organic materials and occur on similar landform positions.
Salonie soils lack thick organic horizons, have sandy-skeletal control sections, and occur on slightly higher flood plains and drainageways.
Terror Lake soils lack thick organic horizons, have cambic horizons, lack aquic conditions within 41 cm (16 in), and occur on upland landform positions.
Tonki soils lack thick organic horizons, have andic properties, and occur on slightly higher flood plains and drainageways.
Tungalara soils lack thick organic horizons, have cambic horizons, lack aquic conditions within 150 cm (60 in), have sandy-skeletal till or outwash substratum, and occur on upland landform positions.
Wineskey soils lack thick organic horizons, have cambic horizons, lack aquic conditions less than 41 cm (16 in), have silty and loamy glaciofluvial and/or lacustrine substratum, and occur on slightly higher landform positions.
Yukuk soils lack thick organic horizons, have andic properties, have sandy-skeletal control sections, and occur on slightly higher flood plains and drainageways.

DRAINAGE AND PERMEABILITY:
Drainage class: Very poorly drained
Saturated Hydraulic Conductivity: very high in the Oe horizons and high in the 2C.
Permeability: rapid to very rapid in the Oe horizons and moderate to rapid 2C horizons.
Runoff: negligible to very low.
Ponding, duration, and depth: none to frequently with brief to very long and 0 to 61 cm (0 to 24 in).
Flooding and duration: none to frequently with brief to long.
Hydric Indicators: A2 Histic epipedon, A6 Organic bodies, and A8 Muck presence

USE AND VEGETATION:
The natural vegetation is dominantly sedges and water tolerant grasses. The principal use is grazing, but most areas are used only by wildlife.

DISTRIBUTION AND EXTENT: MLRA 220 Alexander Archipelago-
Gulf of Alaska Coast.
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:

Hemic organic material: 0 to 155 cm (61 to 35 in) (Oe horizon)

Lithological discontinuity (Glacial till): 155 to 200 cm (61 to 79 in)

ADDITIONAL DATA:

User pedon Id: 09SS 09207

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National Cooperative Soil Survey
U.S.A.