LOCATION UGAANI AK
Established Series
SAS/MPS/TJR
02/2022
UGAANI SERIES
Landscape--lava field
Landform--rise
Slope--1 to 10 percent
Parent material--volcanic ash over basalt residuum
Mean annual precipitation--about 575 mm
Mean annual air temperature--about -3 degrees C
Depth class--shallow
Drainage class--well drained
Soil moisture regime--udic
Soil temperature regime--cryic
Soil moisture subclass--typic
TAXONOMIC CLASS: Fragmental, mixed Lithic Cryorthents
TYPICAL PEDON: Ugaani extremely cobbly medial silt on a west northwest facing convex, convex microhigh on a talf, on a slope of 10 percent at an elevation of 388 m (The soil was moist throughout when described on June 27, 2016.)
Oa--0 to 4 cm; stony highly decomposed plant material, dark gray (10YR 4/1) dry, black (10YR 2/1) moist; nonsticky, nonplastic; many very fine and medium and common fine and coarse roots; 5 percent stones, 5 percent cobbles, 15 percent gravel; very strongly acid (pH 5.0); clear irregular boundary
A--4 to 10 cm; highly organic extremely cobbly medial silt, dark gray (7.5YR 4/1) dry, black (7.5YR 2.5/1) moist; weak fine granular structure; very friable, nonsticky, nonplastic; many very fine and common fine and medium roots; common fine and very fine irregular pores; 1 percent stones, 35 gravel percent, 40 percent cobbles; strongly acid (pH 5.1); clear irregular boundary
Bhs--10 to 16 cm; highly organic extremely cobbly medial silt, brown (7.5YR 4/2) dry, very dark brown (7.5YR 2.5/2) moist; weak medium granular structure; friable, nonsticky, nonplastic; many very fine and common fine and medium roots; common fine and very fine irregular pores; 1 percent stones, 35 percent gravel by volume, 40 percent cobbles; strongly acid (pH 5.2); very abrupt irregular boundary
2C--16 to 45 cm; cobbles, yellowish brown (10YR 5/4) dry, dark yellowish brown (10YR 3/4) moist; single grain; loose, nonsticky; 5 percent stones by volume, 40 percent gravel by volume, 50 percent cobbles by volume; strongly acid (pH 5.2); very abrupt irregular boundary
2R--45 to 150 cm; basalt
TYPE LOCATION: Nome Census Area County, Alaska, latitude 63.3266740 longitude -161.6996990 degrees, datum WGS84 (Coordinates determined with a GPS unit)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--2 to 4 degrees C
Soil moisture control section--dry less than 45 consecutive days in June through October
Thickness of ochric epipedon--8 to 18 cm
Thickness of andic soil properties--4 to 14
Depth to lithic contact--25 to 50 cm below mineral soil surface
Layers influenced by volcanic ash
*Thickness--4 to 14 cm
*Phosphorous retention--85 to 100 percent
*Bulk density--0.45 to 0.9 g/cm3
*Ammonium oxalate Al plus 1/2 Fe--2.0 to 4.0 percent
*Volcanic glass content--1 to 20 percent
*1500kPa water content-- less than 100 percent
Particle Size Control Section:
*Total fragments--90 to 100 percent gravels, cobbles, and stones
Oa horizon
Total rock fragment content--3 to 25 percent
Thickness--2 to 6 cm
A horizon
Hue--7.5YR or 10YR
Value--2 to 4 moist, 4 to 6 dry
Chroma--1 to 2
Fine-earth texture--silt, silt loam
Clay--2 to 10 percent
Sand--5 to 25 percent
Organic carbon--6 to 12 percent
Total rock fragment content--45 to 80 percent
Total gravel content--25 to 40 percent
Total cobble content--20 to 45 percent
Total stone content-0 to 5 percent
Reaction--4.9 to 5.4
Thickness-- 2 to 6 cm
Bhs horizon
Hue--7.5YR or 5YR
Value--2 to 3 moist, 4 or 5 dry
Chroma--2 or 3
Fine-earth texture--silt, silt loam
Clay--2 to 10 percent
Sand--5 to 35 percent
Organic carbon--6 to 12 percent
Total rock fragment content--35 to 80 percent
Total gravel content--20 to 40 percent
Total cobble content--0 to 40 percent
Total stone content--0 to 5 percent
Reaction--5.2 to 5.9
Thickness--2 to 8 cm
2C horizon
Hue--7.5YR or10YR
Value--3 to 5 moist, 5 to 7 dry
Chroma--3 to 5
In lieu of texture--gravels or cobbles
Organic carbon--0.1 to 1 percent
Total rock fragment content--90 to 100 percent
Total gravel content--30 to 70 percent
Total cobble content--30 to 60 percent
Total stone content--0 to 10 percent
Reaction--5.2 to 6.1
Thickness--15 to 30 cm
2R horizon
COMPETING SERIES: none
GEOGRAPHIC SETTING:
*Elevation--230 to 650 m
*Climate--warm, moist summers; cold, dry winters
*Mean annual precipitation--500 to 650 mm
*Mean annual air temperature-- -5 to -1 degrees C
*Frost-free period--55 to 90 days
GEOGRAPHICALLY ASSOCIATED SOILS:
*
Wagonboxcreek--umbric epipedon, medial over loamy; swales on lava fields
*
Uyagak--cambic horizon, thickness of zone with andic soil properties greater than 14 cm, ashy over loamy-skeletal; depressions on lava fields
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
*Drainage class--well drained
*Saturation during normal years--none
*Saturated hydraulic conductivity (Ksat)--very high in the surface organic layer and the fragmental soil layers, moderately high or high throughout the rest of the profile
USE AND VEGETATION:
Use--wildlife habitat, recreation, subsistence
Potential native vegetation--crustose lichen, witch's hair lichen, dwarf birch, bryocaulon lichen, greygreen reindeer lichen, star reindeer lichen, eightpetal mountain-avens, black crowberry, marsh Labrador tea, alpine azalea, whiteworm lichen, white arctic mountain heather, reindeer lichen, altai fescue, alpine sweetgrass, mountain harebell, arctic willow, northern singlespike sedge,
DISTRIBUTION AND EXTENT: Nulato Hills-Southern Seward Peninsula Highlands, Alaska; MLRA 240; small extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: WASILLA, ALASKA
SERIES ESTABLISHED: Nulato Hills BLM area, Nome Census Area, Alaska; 2021
REMARKS:
Diagnostic horizons and features recognized in this pedon
*Particle-size control section--zone from 29 to 45 cm
*Ochric epipedon--zone from 0 to 16 cm
*Andic soil properties--zone from 4 to 16 cm
*Lithologic discontinuity--16 to 150 cm
*Lithic contact--45cm
________________________________________
National Cooperative Soil Survey
U.S.A.