LOCATION TLOZHAVUN AK
Established Series
JDP/NDP/TJR
02/2022
TLOZHAVUN 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--well drained
Soil moisture regime--udic
Soil temperature regime--cryic
Soil moisture subclass--typic
TAXONOMIC CLASS: Coarse-silty, mixed, superactive Typic Haplocryepts
TYPICAL PEDON: Tlozhavun silt loam on a forested terrace with a slope of 3 percent and an elevation of 105 m (The soil was moist throughout when described on August 25, 2015.)
Oi--0 to 9 cm; slightly decomposed plant material; common very fine, fine, and coarse roots, and many medium roots; neutral (pH 6.6); abrupt smooth boundary
Bw--9 to 27 cm; silt loam; reddish yellow (7.5YR 6/6) dry, strong brown (7.5YR 4/6) moist; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky and nonplastic; common very fine, fine, coarse, and very coarse roots, and many medium roots; few fine and medium pores; noneffervescent; moderately acid (pH 6.0); clear smooth boundary
BC--27 to 50 cm; silt loam; reddish yellow (7.5YR 7/6) dry, strong brown (7.5YR 5/6) moist; weak thin platy structure; slightly hard, friable, slightly sticky and nonplastic; common fine, medium, and coarse roots; few fine and medium pores; slightly effervescent; slightly alkaline (pH 7.5); clear smooth boundary
C--50 to 106 cm; very fine sandy loam; pale yellow (2.5Y 7/3) dry, light olive brown (2.5Y 5/3) moist; massive; soft, very friable, nonsticky and nonplastic; common fine and medium roots; few fine and medium pores; strongly effervescent; moderately alkaline (pH 8.0)
Cf--106 to 131 cm; permanently frozen very fine sandy loam; pale yellow (2.5Y 7/3) dry, light olive brown (2.5Y 5/3) moist; massive; slightly effervescent; slightly alkaline (pH 7.5)
TYPE LOCATION: Yukon-Koyukuk Census Area, Alaska; latitude 66.3438623 degrees, longitude -148.7570622 degrees, datum WGS84 (coordinates determined with a GPS)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--0.5 to 2.5 degrees C
Depth to permafrost--100 to 150 cm
Base saturation--greater than 50 percent in all layers within 50 cm of the mineral soil surface
Oi horizon
Combined thickness--5 to 15 cm
Reaction--6.0 to 7.5
Oe horizon (where present)
Combined thickness--5 to 15 cm
Reaction--6.0 to 7.5
A horizon (where present)
Hue--2.5Y to 7.5YR
Value--2 or 3 moist, 4 or 5 dry
Chroma--2 or 3 moist
Fine-earth texture--silt loam, very fine sandy loam, loam
Clay content--0 to 18 percent
Reaction--6.0 to 7.5
Effervescence--none to slight
Thickness--5 to 15 cm
Bw horizon
Hue--2.5Y to 7.5YR
Value--3 to 5 moist, 5 to 7 dry
Chroma--2 to 6 moist
Fine-earth texture--silt loam, very fine sandy loam
Clay content--0 to 18 percent
Reaction--6.0 to 8.0
Effervescence--none to strong
Thickness--15 to 50 cm
BC horizon
Hue--2.5Y to 7.5YR
Value--3 to 5 moist, 5 to 7 dry
Chroma--2 to 6 moist
Fine-earth texture--silt loam, very fine sandy loam, fine sandy loam
Clay content--0 to 18 percent
Reaction--6.0 to 8.0
Effervescence--none to strong
Thickness--10 to 60 cm
C and Cf horizons
Hue--10YR, 2.5Y
Value--3 to 5 moist, 5 to 7 dry
Chroma--1 to 3 moist
Fine-earth texture--silt loam, very fine sandy loam, silt
Clay content--0 to 18 percent
Reaction--7.0 to 8.5
Effervescence--none to strong
Combined thickness--75 to 125 cm
COMPETING SERIES:
Bodenburg--these soils have sandy substrata within the series control section
Fairbanks--these soils contain substantial mica and are formed in eolian parent materials
Fairless--these soils contain substantial mica and are formed in eolian parent materials
Koyukuk--these soils contain substantial mica and have sandy and gravelly substrata within the series control section
Nunaniq--these soils are acidic throughout the series control section
Toghotthele--these soils have sandy substrata within the series control section
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:
Tajittro--aquic conditions within 100 cm; lower positions on similar landforms; permafrost within 1 m
Chissovun--aquic conditions within 50 cm; lower positions similar landforms; permafrost within 1 m
Yanert--aquic conditions within 25 cm; swales on similar landforms
Gushdoiman--aquic conditions within 25 cm; tussock scrub depressions on similar landforms; permafrost within 1 m
Choonjik--no aquic conditions within 150 cm; calcareous; similar landforms
Yasuda--aquic conditions within 25 cm; sodic properties; grassland depressions on similar landforms
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Saturation in normal years--none
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--high throughout
USE AND VEGETATION:
Use--wildlife habitat, subsistence, recreation
Potential natural vegetation--White spruce, quaking aspen, russet buffaloberry, prickly rose, grayleaf willow, twinflower, lingonberry, purple reedgrass, false toadflax, tall bluebells, Jakutsk snowparsley, sidebells wintergreen, eastern pasqueflower, splendid feather moss, Ptilidium liverwort, greygreen reindeer lichen, felt lichen, cup lichen
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 34 to 109 cm
*Ochric epipedon
*Cambic horizon--Bw horizon
*Permafrost--Cf horizon
Soils in this series may sometimes meet the criteria for a folistic epipedon, but this horizon is not diagnostic within the Haplocryepts great group.
Soils in this series do not have identifiable secondary carbonates within 100 cm of the mineral soil surface, though some horizons may effervesce.
National Cooperative Soil Survey
U.S.A.