LOCATION TANJOGA                 AK

Established Series
JDP/TJR
02/2022

TANJOGA SERIES

Landscape--alluvial plains
Landform--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--cryic
Soil moisture subclass--typic

TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, nonacid Histic Cryaquepts

TYPICAL PEDON: Tanjoga stratified peat, mucky peat on a scrubland terrace with a slope of 1 percent and an elevation of 100 m (The soil was wet throughout when described on August 31, 2015.)

Oe/Oa1--0 to 9 cm; stratified peat to mucky peat; common very fine, fine, and medium roots; noneffervescent; slightly acid (pH 6.1); abrupt smooth boundary

Oa2--9 to 25 cm; muck; common very fine and fine roots; noneffervescent; slightly acid (pH 6.3); abrupt smooth boundary

Cg1--25 to 45 cm; silt loam; gray (2.5Y 6/1) dry, dark gray (2.5Y 4/1) moist; massive; moderately hard, firm, nonsticky and slightly plastic; common fine roots; few fine and medium pores; 20 percent strong brown (7.5YR 4/6) moist, masses of oxidized iron in matrix; noneffervescent; slightly acid (pH 6.4); clear smooth boundary

Cg2--45 to 65 cm; very fine sandy loam; 50 percent gray (10YR 5/1) dry, very dark gray (10YR 3/1) moist and 50 percent grayish brown (10YR 5/2) dry, very dark grayish brown (10YR 3/2) moist; massive; moderately hard, firm, nonsticky and moderately plastic; few fine pores; 5 percent dark gray (2.5Y 4/1) moist, iron depletions in matrix and 10 percent brown (7.5YR 4/4) moist, masses of oxidized iron in matrix; noneffervescent; neutral (pH 6.6); clear smooth boundary

Cg3--65 to 95 cm; very fine sandy loam; 50 percent grayish brown (10YR 5/2) dry, very dark grayish brown (10YR 3/2) moist and 50 percent light brownish gray (10YR 6/2) dry, dark grayish brown (10YR 4/2) moist; massive; moderately hard, firm, nonsticky and moderately plastic; few fine pores; 5 percent dark gray (2.5Y 4/1) moist, iron depletions in matrix and 5 percent dark brown (7.5YR 3/4) moist, masses of oxidized iron in matrix; noneffervescent; neutral (pH 7.0)

TYPE LOCATION: Yukon-Koyukuk Census Area, Alaska; latitude 66.2194990 degrees, longitude -149.1231880 degrees, datum WGS84 (coordinates determined with a GPS)

RANGE IN CHARACTERISTICS:
Mean annual soil temperature--0.5 to 2.5 degrees C

Oe and Oa horizons
Combined thickness--20 to 35 cm
Reaction--6 to 8

Cg1, Cg2, and Cg3 horizons
Hue--10YR, 2.5Y
Value--2 to 4 moist, 4 to 6 dry
Chroma--1 or 2 moist
Fine-earth texture--silt loam, very fine sandy loam
Clay content--0 to 18 percent
Reaction--6 to 8
Effervescence--none to slight
Combined thickness--115 to 130 cm

COMPETING SERIES:
Fishnet--frequent flooding; adjacent low energy floodplains
Disappear--these soils are very strongly acid to strongly acid in the solum
Liscum--these soils have a water table higher than 50 cm in summer months

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:
Fishnet--aquic conditions within 50 cm with frequent flooding; adjacent low energy floodplains
Nuntragut--aquic conditions within 100 cm; adjacent terraces; forested
Jokinaugh--aquic conditions within 25 cm; depressions on adjacent distal floodplains; grassland vegetation

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--very poorly drained
Saturation in normal years--water table top depth between a depth of 0 to 25 cm in June, and saturated below a depth of 25 cm throughout the rest of the year
Flooding--occasional, brief
Ponding--frequent, long
Saturated hydraulic conductivity (Ksat)--high throughout

USE AND VEGETATION:
Use--wildlife habitat, subsistence, recreation
Potential natural vegetation--white spruce, tealeaf willow, littletree willow, Bebb willow, sweetgale, Siberian alder, bluejoint, water sedge, field horsetail, sidebells wintergreen

DISTRIBUTION AND EXTENT: Yukon Flats Lowlands, Alaska; MLRA 232; small 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 50 to 125 cm
*Histic epipedon--Oe/Oa1 and Oa2 horizons
*Redoximorphic iron concentrations--Cg1, Cg2, Cg3 horizons
*Redoximorphic iron depletions with chroma of 2 or less--Cg2, Cg3 horizons
*Reduced matrix--Cg1, Cg2, Cg3 horizons
*Aquic conditions--Cg1, Cg2, Cg3 horizons

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National Cooperative Soil Survey
U.S.A.