LOCATION UKNAVIKFAMILY           AK

Tentative Series
Rev. JPM
02/2022

UKNAVIKFAMILY SERIES

Note: Used as a placeholder series until a series is established under the family class
Depth class: Very deep
Drainage class: poorly drained
Parent material: loess and alluvium
Landform: floodplains, terraces, and mountain drainages
Slopes: 0 to 4 percent
Mean annual precipitation: about 16 inches
Mean annual temperature: about 29 degrees F.

TAXONOMIC CLASS: Coarse-silty, mixed, superactive, nonacid Typic Cryaquepts

TYPICAL PEDON: Uknavikfamily silt loam - on a slope of 0 percent in a thermokarst depression on a terrace at 95 feet elevation. (All colors are for moist soil unless noted)

Oi--0 to 4 inches (0 to 10 cm) very dark brown (10YR 2/2) peat; many very fine and fine roots, common medium roots, and few coarse roots; extremely acid, pH 4.3; clear smooth boundary.

Bg--4 to 18 inches (10 to 45 cm) dark grayish brown (10YR 4/2) silt loam; friable, nonsticky, nonplastic; common very fine and fine roots, few medium and coarse roots; moderately acid, pH 5.8; gradual smooth boundary.

Cg--18 to 60 inches (45 to 152 cm) dark gray (5Y 4/1) silt loam; friable, nonsticky, nonplastic; few very fine and fine roots, few medium and coarse roots; 8 percent fine dark yellowish brown (10YR 4/6) redox concentrations; slightly acid, pH 6.2.

TYPE LOCATION: Western Interior Rivers Soil Survey Area, Alaska; Reindeer Lake Area; UTM north 6884182 and UTM east 481886, zone 4.

RANGE IN CHARACTERISTICS:
Soil moisture regime: Aquic
Mean annual soil temperature: 32 to 34 degrees F
Thickness of organic materials: 2 to 6 inches
Depth to 2C horizons: greater than 60 inches

O horizons:
Matrix color: hue 10YR or 7.5YR value 2 or 3, chroma 1 or 2
Texture: peat, mucky peat, or muck
Reaction Class: extremely acid to strongly acid

A horizons: present in some pedons

B horizons:
Matrix color: hue 10YR, or 7.5YR; value 4; chroma 1 to 4
Texture: silt loam or silt
Reaction Class: strongly acid

C horizons:
Matrix color: hue 5Y, 2.5Y, or 10YR; value 4 or 5; chroma 1 to 3
Texture: silt loam or silt
Reaction Class: moderately acid to slightly acid

2C horizons (when present)
Texture: gravelly sand, loamy sand, fine sand

COMPETING SERIES: These are no series in this family. When a series is established, this series placeholder will be dropped (see REMARKS).

GEOGRAPHIC SETTING:
Parent material: loess and alluvium
Landform: floodplains, terraces, and mountain drainages
Slope: 0 to 4 percent
Mean annual temperature: 28 to 30 degrees F.
Mean annual precipitation: 15 to 18 inches

GEOGRAPHICALLY ASSOCIATED SOILS: These include the Ulet and the Ulesqiirluni soils on similar landforms.

DRAINAGE AND PERMEABILITY: Poorly drained. Low to medium runoff. Permeability is moderate.

USE AND VEGETATION: Used for subsistence and wildlife habitat. The native vegetation is typical of Boreal scrub and grass, subalpine forest and scrub, and tundra sedge.

DISTRIBUTION AND EXTENT: MLRA 229 - Interior Alaska Lowlands; MLRA 230 - Yukon-Kuskokwim Highlands; and MLRA 238- Yukon-Kuskokwim Coastal Plain, Alaska. The soil is extensive.

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

SERIES PROPOSED: The Western Interior Rivers Area, Alaska, 2007

REMARKS: This series is set-up as a placeholder to allow the use of a short family name. The range in characteristics is broader than a typical series and may even encompass the full range of the family. There are currently no series designated in this soil family.

Diagnostic features and horizons recognized in this profile include:
Mineral horizons: from 4 to 60 inches.
Temperature regime: Cryic
Moisture regime: Aquic
Cambic horizon: 4 to 18 inches
Redox features: 18 to 60 inches

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National Cooperative Soil Survey
U.S.A.