LOCATION GUSHDOIMAN              AK

Established Series
JDP/NDP/TJR
05/2022

GUSHDOIMAN SERIES

Landscape--alluvial plains
Landform--depressions on stream terraces
Slope--0 to 3 percent
Parent material--organic material over alluvium
Mean annual precipitation--about 255 mm
Mean annual air temperature--about -6 degrees C
Depth class--very deep
Drainage class--very poorly drained
Soil moisture regime--aquic
Soil temperature regime--gelic
Soil moisture subclass--typic

TAXONOMIC CLASS: Coarse-silty, mixed, superactive, nonacid, subgelic Typic Histoturbels

TYPICAL PEDON: Gushdoiman mucky peat on a tussock-scrub terrace depression with a slope of 0 percent and an elevation of 110 m (The soil was wet throughout when described on August 30, 2015.)

Oe--0 to 14 cm; mucky peat; many medium roots and common very fine to very coarse roots; slightly acid (pH 6.3); clear smooth boundary

Oa--14 to 30 cm; muck; many medium roots, and common very fine to very coarse roots; neutral (pH 6.7); abrupt smooth boundary

Cg--30 to 50 cm; silt loam; gray (2.5Y 5/1) dry, very dark gray (2.5Y 3/1) moist; massive; slightly hard, friable, slightly sticky and nonplastic; common very fine and fine roots; few fine and medium pores; noneffervescent; moderately acid (pH 6.0); gradual smooth boundary

Cgjjf--50 to 100 cm; permanently frozen silt loam; light brownish gray (2.5Y 6/2) dry, dark grayish brown (2.5Y 4/2) moist; massive; very hard, extremely firm, slightly sticky and nonplastic; few fine pores; noneffervescent; neutral (pH 7.1)

TYPE LOCATION: Yukon-Koyukuk Census Area, Alaska; latitude 66.1404839 degrees, longitude -147.7262149 degrees, datum WGS84 (coordinates determined with a GPS)

RANGE IN CHARACTERISTICS:
Mean annual soil temperature-- -4 to 1 degrees C
Depth to permafrost--30 to 65 cm
Depth to redoximorphic features--25 to 50 cm
Other features--cryoturbation within 150 cm

Oe and Oa horizons
Combined thickness--20 to 35 cm
Reaction--5.5 to 7.0

Cg horizon
Value--2 to 4 moist, 4 to 6 dry
Chroma--1 or 2 moist
Fine-earth texture--silt loam, very fine sandy loam, loam
Clay content--0 to 18 percent
Reaction--6.0 to 7.5
Combined thickness--10 to 30 cm

Cgf horizon (where present)
Value--2 to 4 moist, 4 to 6 dry
Chroma--1 or 2 moist
Fine-earth texture--silt loam, very fine sandy loam, loam
Clay content--0 to 18 percent
Reaction--6.0 to 8.0
Combined thickness--85 to 120 cm

Cgjjf horizon
Value--2 to 4 moist, 4 to 6 dry
Chroma--1 or 2 moist
Fine-earth texture--silt loam, very fine sandy loam, loam
Clay content--0 to 18 percent
Reaction--6.0 to 8.0
Combined thickness--85 to 120 cm

COMPETING SERIES:
Chissovun--occasionally ponded, with woodland vegetation
Goldstream--strongly to very strongly acid mineral horizons
Saulich--pedogenic B horizons; moderately acid to neutral mineral horizons
Strelna--no aquic conditions
Turbellina--strongly acid to extremely acid mineral horizons
Windy Creek--pedogenic B horizons; moderately acid to neutral mineral horizons

GEOGRAPHIC SETTING:
Elevation--90 to 300 m
Climate--short, warm summers and long, very cold winters
Mean annual precipitation--210 to 310 mm
Mean annual air temperature-- -12 to 0 degrees C
Frost-free period--45 to 97 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Sussaymin--aquic conditions within 25 cm; bogs on similar landforms; woodland vegetation
Twin--aquic conditions within 25 cm and rare flooding; higher positions on similar landforms; woodland vegetation
Chissovun--aquic conditions within 50 cm with occasional ponding; higher positions on similar landforms; woodland vegetation
Tajittro--aquic conditions within 100 cm; higher positions on similar landforms; forested
Yanert--aquic conditions within 25 cm with frequent ponding; adjacent swales on similar landforms

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--very poorly drained
Saturation in normal years--saturated between a depth of 0 and 25 cm from May through September, and below a depth of 40 cm throughout the rest of the year
Flooding--none
Ponding--frequent, very long
Saturated hydraulic conductivity (Ksat)--high throughout

USE AND VEGETATION:
Use--wildlife habitat, subsistence, recreation
Potential natural vegetation--white spruce, black spruce, little tree willow, tealeaf willow, grayleaf willow, shrub birch, leatherleaf, bog blueberry, bog Labrador tea, shrubby cinquefoil, Bigelow's sedge, tussock cottongrass, horsetail

DISTRIBUTION AND EXTENT: Yukon Flats Lowlands, Alaska; MLRA 232; large extent

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

SERIES ESTABLISHED: Yukon Flats National Wildlife Refuge, Yukon-Koyukuk Census Area, Alaska; 2020

REMARKS:
Diagnostic horizons and other features in this pedon
*Particle-size control section--zone from 55 to 130 cm
*Histic epipedon--Oe and Oa horizons
*Reduced matrix--Cg and Cgjjf horizons
*Permafrost--Cgjjf horizon
*Cryoturbation--Cgjjf horizon
*Aquic conditions--Oa, Cg and Cgjjf horizons

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National Cooperative Soil Survey
U.S.A.