LOCATION NULUK                   AK

Established Series
Rev. MHC/DLM
05/2022

NULUK SERIES

Depth class: very deep
Drainage class: somewhat poorly drained
Landforms: flood plains, flood plains on alluvial fans
Parent material: sandy and silty alluvium over sandy and gravelly alluvium
Elevation: 377 to 617 feet
Slope: 0 to 3 percent
Annual precipitation: 21 to 29 inches
Annual temperature: 23 to 25 degrees F
Frost-free period: 60 to 90 days

TAXONOMIC CLASS: Coarse-loamy over sandy or sandy-skeletal, mixed, superactive, nonacid, subgelic Aquic Gelifluvents

TYPICAL PEDON: Nuluk silt loam - on a slope of 1 percent willow/mixed grass-forb scrub. (All colors are for moist soil)

Oi--0 to 1 inch; very dark brown (10YR 2/2) slightly decomposed plant material; many very fine and fine, common medium and common coarse roots; moderately acid (pH 5.8); abrupt smooth boundary.

A--1 to 3 inches; very dark brown (10YR 2/2) silt loam; very friable, nonsticky and nonplastic; many very fine and fine, common medium and common coarse roots; moderately acid 9pH 5.8); clear wavy boundary.

C1--3 to 19 inches; very dark grayish brown (2.5Y 3/2) stratified fine sand to silt; very friable, nonsticky and nonplastic; few very fine and fine roots; 10 mm dark yellowish brown (10YR 4/4) high chroma redox concentrations (approximately 20 percent of horizon); 5 mm dark gray (5Y 4/1) low chroma redox depletions (approximately 15 percent of horizon); slightly acid (pH 6.2); gradual smooth boundary.

2C2--19 to 23 inches; very dark grayish brown (2.5Y 3/2) very gravelly coarse sand; loose, nonsticky and nonplastic; 45 percent gravel; neutral (pH 6.9); gradual smooth boundary.

2C3--23 to 60 inches; varigated extremely gravelly coarse sand; loose, nonsticky and nonplastic; 45 percent gravel; 20 percent cobble; neutral (pH 6.9).

TYPE LOCATION: Steward River Training Area, Alaska; UTM coordinates: Zone 3, Easting 473861, Northing 7185453.

RANGE IN CHARACTERISTICS:
Soil moisture class: udic
Average annual soil temperature: about 31 degrees F.
Mean summer soil temperature: about 35 degrees F.
Depth to strongly contrasting textural stratification: 9 to 33 inches

Oi horizon:
Hue: 5YR to 10YR
Value: 2 to 3
Chroma: 1 to 3
Organic matter content: 65 to 90 percent
Reaction: very strongly acid to moderately acid

A horizon:
Value: 2 or 3
Chroma: 1 or 2
Clay content: 0 to 10 percent
Silt content: 55 to 75 percent
Sand content: 15 to 35 percent
Organic matter content: 2 to 4 percent
Reaction: very strongly acid to moderately acid

C1 horizon:
Hue: 2.5Y or 5Y
Value: 2 to 4
Chroma: 1 to 3
Clay content: 0 to 10 percent
Silt content: 15 to 35 percent
Sand content: 60 to 85 percent

2C2 horizon:
Hue: 10YR to 5Y
Value: 2.5 to 4
Chroma: 1 to 3
Texture: very cobbly loamy sand, very gravelly coarse sand, extremely gravelly coarse sand
Clay content: 0 to 5 percent
Silt content: 0 to 15 percent
Sand content: 80 to 95 percent
Rock fragments: 30 to 60 percent rounded indurated gravel, 0 to 40 percent rounded indurated cobbles
Reaction: strongly acid to neutral

COMPETING SERIES: There no competing series in this classification.

GEOGRAPHIC SETTING:
Landforms: flood plains, flood plains on alluvial fans
Parent material: sandy and silty alluvium over sandy and gravelly alluvium
Elevation: 377 to 617 feet
Slope: 0 to 3 percent
Annual precipitation: 21 to 29 inches
Annual temperature: 23 to 25 degrees F
Frost-free period: 60 to 90 days

GEOGRAPHICALLY ASSOCIATED SOILS: These include Belmezok and Cassiterite soils. Belmezok soils are somewhat poorly drained, very deep, and occur on flood plains Cassiterite soils are somewhat poorly drained, very deep, and occur on flood plains on mountains.

DRAINAGE AND PERMEABILITY: Somewhat poorly drained, low runoff. Saturated hydraulic conductivity is moderately high to high in the loamy part of the profile and high to very high in the sandy-skeletal part of the profile.

USE AND VEGETATION: Used for military use and wildlife habitat. Native vegetation is willow/mixed grass-forb scrub.

DISTRIBUTION AND EXTENT: MLRA 240, Nulato Hills-Southern Seward Peninsula Highlands, Alaska. The series is of small extent.

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: WASILLA, ALASKA

SERIES ESTABLISHED: Steward River Training Site, Alaska, 2005

REMARKS: Diagnostic features and horizons recognized in this profile include:
No diagnostic horizons
Redoximorphic features: 3 to 19 inches. (C1 horizon)
Lithologic discontinuity: At the upper boundary of 2C2 horizon
Coarse-loamy upper part of the particle size control section: 10 to 19 inches, sandy or sandy-skeletal lower part of the particle size control section: 19 to 40 inches
Temperature regime: cryic

ADDITIONAL DATA:

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National Cooperative Soil Survey
U.S.A.