LOCATION TAJITTRO AK
Established Series
JDP/NR/TJR
02/2022
TAJITTRO SERIES
Landscape--alluvial plains
Landform--stream terraces
Slope--0 to 3 percent
Parent material--alluvium
Mean annual precipitation--about 255 mm
Mean annual air temperature--about -6 degrees C
Depth class--very deep
Drainage class--moderately well drained
Soil moisture regime--udic
Soil temperature regime--gelic
Soil moisture subclass--typic
TAXONOMIC CLASS: Coarse-silty, mixed, superactive, nonacid, subgelic Aquic Haploturbels
TYPICAL PEDON: Tajittro silt loam on a forested terrace with a slope of 2 percent and an elevation of 128 m (The soil was moist throughout when described on July 11, 2014.)
Oi--0 to 6 cm; slightly decomposed plant material; common medium roots; slightly alkaline (pH 7.4); abrupt smooth boundary
Oe--6 to 11 cm; moderately decomposed plant material; common medium and coarse roots; moderately acid (pH 5.8); abrupt smooth boundary
A--11 to 18 cm; silt loam; brown (10YR 5/3) dry, dark brown (10YR 3/3) moist; weak fine granular structure; soft, very friable; common fine and medium roots; common fine and medium pores; noneffervescent; slightly alkaline (pH 7.6); clear wavy boundary
Bw--18 to 28 cm; silt loam; light brownish gray (2.5Y 6/2) dry, dark grayish brown (2.5Y 4/2) moist; weak medium subangular blocky structure; soft, very friable; common fine and medium roots; few fine and medium pores; 5 percent light olive brown (2.5Y 5/6) moist, mottles in matrix; strongly effervescent; moderately alkaline (pH 8.3); clear smooth boundary
Bwjj--28 to 75 cm; silt loam; 50 percent light yellowish brown (2.5Y 6/3) dry, olive brown (2.5Y 4/3) moist, and 50 percent light yellowish brown (10YR 6/4) dry, dark yellowish brown (10YR 3/4) moist; moderate thin platy structure; slightly hard, friable; common fine roots; few fine and medium pores; 10 percent light olive brown (2.5Y 5/6) moist, masses of oxidized iron in matrix; violently effervescent; moderately alkaline (pH 8.3); clear smooth boundary
Cf--75 to 100 cm; stratified permanently frozen very fine sandy loam to permanently frozen silt loam; light yellowish brown (2.5Y 6/3) dry, olive brown (2.5Y 4/3) moist; weak thin platy structure; 20 percent light olive brown (2.5Y 5/6) moist, masses of oxidized iron in matrix; very slightly effervescent; moderately alkaline (pH 8.0)
TYPE LOCATION: Yukon-Koyukuk Census Area, Alaska; latitude 66.2784700 degrees, longitude -148.0753589 degrees, datum WGS84 (coordinates determined with a GPS)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature-- -4 to 1 degrees C
Depth to permafrost--60 to 100 cm
Depth to redoximorphic features--75 cm or more below the mineral soil surface
Other features--cryoturbation within 150cm
Oi and Oe horizons
Combined thickness--5 to 15 cm
Reaction--5.5 to 7.5
A horizon
Hue--10YR, 2.5Y
Value--2 to 4 moist, 4 to 6 dry
Chroma--1 to 3 moist
Fine-earth texture--silt loam, very fine sandy loam, loam
Clay content--0 to 18 percent
Reaction--6.5 to 8.0
Effervescence--none to slight
Thickness--5 to 15 cm
Bw and Bwjj horizons
Hue--10YR, 2.5Y
Value--2 to 5 moist, 4 to 7 dry
Chroma--2 to 4 moist
Fine-earth texture--silt loam, very fine sandy loam
Clay content--0 to 18 percent
Reaction--6.5 to 9.0
Effervescence--none to violent
Combined thickness--15 to 80 cm
BC horizon
Hue--10YR, 2.5Y
Value--2 to 5 moist, 4 to 7 dry
Chroma--2 to 4 moist
Fine-earth texture--silt loam, very fine sandy loam
Clay content--0 to 18 percent
Reaction--6.5 to 9.0
Effervescence--none to violent
Thickness--15 to 80 cm
Cf horizons
Value--2 to 4 moist, 4 to 6 dry
Chroma--1 to 3 moist
Fine-earth texture--silt loam, very fine sandy loam
Clay content--0 to 18 percent
Reaction--6.5 to 8.5
Effervescence--none to strong
Thickness--50 to 125 cm
COMPETING SERIES:
None
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:
Tlozhavun--no aquic conditions within 150 cm; higher positions on similar landforms
Chissovun--aquic conditions within 50 cm; lower positions similar landforms
Yanert--aquic conditions within 25 cm; swales on similar landforms
Gushdoiman--aquic conditions within 25 cm; tussock scrub depressions on similar landforms
Choonjik--no aquic conditions within 150 cm; calcareous; higher positions on similar landforms
Yasuda--aquic conditions within 25 cm; sodic properties; grassland depressions on similar landforms
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--moderately well drained
Saturation in normal years--water table top depth between a depth of 50 to 100 cm in June, July, and August
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--moderately high to high throughout
USE AND VEGETATION:
Use--wildlife habitat, subsistence, recreation
Potential natural vegetation--White spruce, black spruce, quaking aspen, red fruit bearberry, grayleaf willow, prickly rose, lingonberry, twinflower, russet buffaloberry, shrubby cinquefoil, littletree willow, reedgrass, false toadflax, dwarf scouringrush, field horsetail, stairstep moss, Tomentypnum moss, felt lichen, greygreen reindeer lichen
DISTRIBUTION AND EXTENT: Yukon Flats Lowlands, Alaska; MLRA 232; moderate 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 36 to 111 cm
*Ochric epipedon
*Redoximorphic iron concentrations--Bwjj, and Cf horizons
*Aquic conditions--Bwjj, and Cf horizons
*Permafrost--Cf horizon
*Cryoturbation--Bwjj horizon
*Cambic horizon--Bw and Bwjj horizons
Organic horizons are saturated for more than 30 days (cumulative) in normal years, and do not meet the criteria for a folistic epipedon.
National Cooperative Soil Survey
U.S.A.