LOCATION IPRUGALET               AK

Established Series
MPS/SAS
05/2022

IPRUGALET SERIES

Landscape--mountains
Landform--mountain slopes
Slope--5 to 65 percent
Parent material--volcanic ash influenced colluvium over gravelly colluvium over residuum
Mean annual precipitation--about 555 mm
Mean annual air temperature--about -4 degrees C
Depth class--deep
Drainage class--well drained
Soil moisture regime--udic
Soil temperature regime--cryic
Soil moisture subclass--typic

TAXONOMIC CLASS: Loamy-skeletal, isotic Typic Humicryepts

TYPICAL PEDON: Iprugalet medial silt loam on a north northwest facing convex, convex mountain slope, on a slope of 8 percent at an elevation of 707 m (The soil was moist from 0 to 140 cm when described on June 22, 2018.)

Oa--0 to 7 cm; highly decomposed plant material, brown (7.5YR 5/2) dry, dark brown (7.5YR 3/2) moist; many very fine and medium, and common fine roots; extremely acid (pH 4.2); abrupt wavy boundary

A--7 to 15 cm; gravelly medial silt loam, dark grayish brown (10YR 4/2) dry, very dark brown (10YR 2/2) moist; weak medium subangular blocky structure; very friable, nonsticky, nonplastic; many very fine and common medium and fine roots; 15 percent gravel; very strongly acid (pH 5.0); abrupt wavy boundary

2Bw--15 to 45 cm; gravelly loam, brown (10YR 5/3) dry, dark brown (10YR 3/3) moist; weak fine granular structure; very friable, nonsticky, nonplastic; common very fine and fine roots; few fine irregular pores; 2 percent cobbles, 20 percent gravel; moderately acid (pH 5.9); clear wavy boundary

2C1--45 to 58 cm; very gravelly silt loam, light yellowish brown (2.5Y 6/3) dry, olive brown (2.5Y 4/3) moist; massive; very friable, nonsticky, nonplastic; common very fine and fine roots; 5 percent cobbles, 50 percent gravel; moderately acid (pH 6.0); abrupt wavy boundary

2C2--58 to 140 cm; extremely gravelly silt loam, light brownish gray (2.5Y 6/2) dry, dark grayish brown (2.5Y 4/2) moist; massive; slightly sticky, nonplastic; 2 percent by channers, 5 percent cobbles, 70 percent gravel; moderately acid (pH 5.6)

3R--140 to 150 cm; bedrock

TYPE LOCATION: Nome Census Area County, Alaska, latitude 63.1015080 longitude -161.3031990 degrees, datum WGS84 (Coordinates determined with a GPS unit)

RANGE IN CHARACTERISTICS:
Mean annual soil temperature--0 to 3 degrees C
Soil moisture control section--dry less than 45 consecutive days in June through October (udic soil moisture regime)
Thickness of umbric epipedon--25 to 55 cm
Depth to lithic contact--100 to 150 cm

Particle Size Control Section:
*Clay--3 to 15 percent
*Total fragments--35 to 85 percent gravels, channers, cobbles

Oa horizon
Thickness--2 to 10 cm

A horizon
Hue--7.5YR or 10YR
Value--2 to 3 moist, 4 or 5 dry
Chroma--2 or 3
Clay--5 to 12 percent
Sand--15 to 45 percent
Organic carbon--8 to 12 percent
Total rock fragment content--3 to 25 percent
Total gravel content--3 to 15 percent
Total cobble content--0 to 10 percent
Total stone content--0 to 1 percent
Bulk density--0.5 to 0.9 g/cm3
Al plus 1/2 Fe--1 to 4 percent
Volcanic glass content--0 to 5 percent
Phosphorous retention--85 to 100 percent
n value--0.7 or less
Reaction--4.4 to 5.8
Thickness--5 to 17 cm

2Bw horizon
Fine-earth texture--silt loam, loam, sandy loam
Clay--6 to 16 percent
Sand--25 to 65 percent
Organic carbon--3 to 7 percent
Total rock fragment content--22 to 60 percent
Total gravel content--10 to 35 percent
Total cobble content--0 to 50 percent
n value--0.7 or less
Reaction--4.9 to 6.0
Thickness--10 to 40 cm

2C1 horizon
Hue--10YR or 2.5Y
Chroma--1 to 3
Fine-earth texture--silt loam, loam, coarse sandy loam
Clay--6 to 14 percent
Sand--30 to 65 percent
Organic carbon--1 to 2 percent
Total rock fragment content--55 to 75 percent
Total gravel content--50 to 70 percent
Total cobble content--0 to 5 percent
Reaction--4.8 to 6.0
Thickness--10 to 40 cm

2C2 horizon
Hue--10YR or 2.5Y
Chroma--1 to 2
Fine-earth texture--silt loam, loam, coarse sandy loam
Clay--6 to 14 percent
Sand--30 to 65 percent
Organic carbon--0.2 to 1 percent
Total rock fragment content--70 to 85 percent
Total gravel content--50 to 70 percent
Total cobble content--0 to 10 percent
Total channer content--0 to 5 percent
Reaction--5.6 to 6.3
Thickness--40 to 110 cm

3R horizon

COMPETING SERIES:
* Tikchik--very deep, cambic horizon, slope range is 0 to 40 percent; hillslopes on hills
* Buchia--very deep, slope range is from 5 to 85 percent; mountain slopes and hillslopes
* Bigelow--deep to glacial till, mountain slopes and glacial basins, slope range is from 5 to 65 percent
* Bross--cambic horizon; alpine hills and ridges
* Crannler--moderately deep to lithic contact, slope range from 50 to 90 percent; mountain sideslopes,
* Henline--moderately deep to lithic contact, slope range from 6 to 90 percent; uplands
* Hossick--moderately deep to lithic contact, slope range from 4 to 75 percent; ridges and mountain sides of alpine areas
* Mirror--moderately deep to lithic contact, cambic horizon, slope range from 1 to 60 percent; alpine ridges and mountain slopes
* Causewa--moderately deep to lithic contact, cambic horizon, slope range from 0 to 35 percent; high flat mountain tops
* Nagyagat--moderately deep to lithic contact, cambic horizon, slope range is from 0 to 25 percent, mountain slopes and hillslopes on mountains and hills
* Penitente--cambic horizon, slope range from 0 to 60 percent; mountain tops

GEOGRAPHIC SETTING:
*Elevation--150 to 1050 m
*Climate--warm, moist summers; cold, dry winters
*Mean annual precipitation--430 to 745 mm
*Mean annual air temperature-- -6 to -2 degrees C
*Frost-free period--45 to 80 days

GEOGRAPHICALLY ASSOCIATED SOILS:
* Kanguq--moderately deep to paralithic contact, ochric epipedon, cambic horizon, mountain slopes and hillslopes
*MountMcDonald--shallow to paralithic contact, mixed mineralogy, mountain slopes and ridges on mountains

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, high to moderately high throughout the rest of the profile

USE AND VEGETATION:
Use--wildlife habitat, recreation, subsistence
Potential native vegetation--lingonberry, bog blueberry, eightpetal mountain-avens, alpine bearberry, alpine azalea, black crowberry, dwarf birch, greygreen reindeer lichen, reindeer lichen, cetraria lichen, witch's hair lichen, bryocaulon lichen, snow lichen, cup lichen, Moss, smallawned sedge, alpine sweetgrass, star reindeer lichen, blue mountainheath, Bigelow's sedge, skeletonleaf willow, whiteworm lichen, marsh Labrador tea, Altai fescue, groundcedar, arctic lupine, arctic willow, white arctic mountain heather, Siberian alder, arctic woodrush, Barclay's willow, halberd willow, tomentose snow lichen, polytrichum moss, juniper polytrichum moss, red fruit bearberry

DISTRIBUTION AND EXTENT: Nulato Hills-Southern Seward Peninsula Highlands, Alaska; MLRA 240; moderate 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 37 to 107 cm
*Umbric epipedon--zone from 7 to 45 cm
*Andic soil properties--zone from 7 to 15 cm
*Lithic contact--at 140 cm
*Lithologic discontinuity--15 to 140 cm and 140 to 150 cm
*Lab pedon referenced--17N0470

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National Cooperative Soil Survey
U.S.A.