LOCATION STOVECREEK AK
Established Series
SAS/MPS/TJR
02/2022
STOVECREEK SERIES
Landscape--mountains, hills
Landform--drainageways
Slope--0 to 10 percent
Parent material--coarse-loamy alluvium
Mean annual precipitation--about 505 mm
Mean annual air temperature--about -3 degrees C
Depth class--very deep
Drainage class--poorly drained
Soil moisture regime--aquic
Soil temperature regime--cryic
Soil moisture subclass--typic
TAXONOMIC CLASS: Coarse-loamy, isotic, nonacid Humic Cryaquepts
TYPICAL PEDON: Stovecreek peaty silt loam on an east southeast facing linear, linear floodplain on a slope of 6 percent at an elevation of 181 m (The soil was wet, non-satiated, from 0 to 29 cm and wet, satiated, from 23 to 150 cm when described on June 4, 2018.)
A1--0 to 2 cm; peaty silt loam, grayish brown (10YR 5/2) dry, very dark grayish brown (10YR 3/2) moist; moderate fine granular structure; very friable, nonsticky, nonplastic; many very fine and common fine roots; moderately acid (pH 6.0); abrupt smooth boundary
A2--2 to 15 cm; silt loam, grayish brown (10YR 5/2) dry, very dark grayish brown (10YR 3/2) moist; moderate fine granular structure; very friable, nonsticky, nonplastic; many very fine and common fine, medium and coarse roots; moderately acid (pH 5.9); clear smooth boundary
A3--15 to 45 cm; silt loam, grayish brown (2.5Y 5/2) dry, very dark grayish brown (2.5Y 3/2) moist; moderate fine granular structure; friable, nonsticky, slightly plastic; common very fine, fine, medium, and coarse roots; 10 percent medium faint dark yellowish brown (10YR 4/4) masses of oxidized iron in matrix; slightly acid (pH 6.1); gradual smooth boundary
Cg1--45 to 90 cm; silt loam, dark greenish gray (10Y 4/1) dry, greenish black (10Y 2.5/1) moist; massive; friable, slightly sticky, slightly plastic; few fine irregular pores; 5 percent medium faint dark yellowish brown (10YR 4/4) masses of oxidized iron in matrix; slightly acid (pH 6.2); gradual smooth boundary
Cg2--90 to 150 cm; loam, dark greenish gray (10Y 4/1) dry, greenish black (10Y 2.5/1) moist; massive; very friable, slightly sticky, nonplastic; few fine irregular pores; 10 percent by volume; slightly acid (pH 6.2)
TYPE LOCATION: Nome Census Area, Alaska, latitude 63.7186059 longitude -160.4271030 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--saturated throughout the growing season at a depth of 0 to 25 cm (aquic soil moisture regime)
Thickness of umbric epipedon--20 to 50 cm
Depth to redoximorphic features--20 to 50 cm
Particle Size Control Section:
*Clay--5 to 15 percent
*Total rock fragment content--0 to 10 percent gravel
*Sodium fluoride pH--8.4 to 11.6
*Ratio of 1500 kPa water to measured clay--0.6 to 6.0
A1 horizon
Value--2 to 3 moist, 4 or 5 dry
Chroma--2 or 3
Fine-earth texture--silt, silt loam
Clay--6 to 10 percent
Sand--5 to 30 percent
Organic carbon--12 to 18 percent
Reaction--5.4 to 6.5
Thickness--2 to 10 cm
A2 horizon
Value--2 to 3 moist, 4 or 5 dry
Chroma--2 or 3
Fine-earth texture--silt, silt loam
Clay--7 to 12 percent
Sand--5 to 30 percent
Organic carbon--5 to 12 percent
Reaction--5.3 to 6.5
Thickness--10 to 25 cm
A3 horizon
Hue--10YR or 2.5Y
Value--2 to 3 moist, 4 or 5 dry
Chroma--2 or 3
Fine-earth texture--silt, silt loam
Clay--7 to 12 percent
Sand--10 to 35 percent
Organic carbon--5 to 8 percent
Reaction--5.4 to 6.6
Thickness--25 to 35 cm
Cg1 horizon
Hue--2.5Y, 10Y or 5GY
Value--2.5 to 5 moist, 4 or 7 dry
Chroma--1 or 2
Fine-earth texture--silt loam, loam
Clay--3 to 15 percent
Sand--15 to 40 percent
Organic carbon--1 to 3 percent
Reaction--5.9 to 6.7
Thickness--40 to 50 cm
Cg2 horizon
Hue--2.5Y, 10Y or N
Value--2.5 to 4 moist, 4 or 6 dry
Chroma--0 or 1
Fine-earth texture--silt loam, loam, sandy loam
Clay--5 to 15 percent
Sand--40 to 70 percent
Organic carbon--1 to 2 percent
Total rock fragment content--0 to 10 percent gravel
Reaction--6.0 to 7.0
Thickness--60 to 80 cm
COMPETING SERIES:
Damcreek--umbric epipedon, no cambic horizon present, clay content ranges to 25 percent in glaciolacustrine parent material in the lower part of the profile; drainageways on glaciated plains
GEOGRAPHIC SETTING:
*Elevation--100 to 650 m
*Climate--warm, moist summers; cold, dry winters
*Mean annual precipitation--400 to 640 mm
*Mean annual air temperature-- -5 to -1 degrees C
*Frost-free period--55 to 90 days
GEOGRAPHICALLY ASSOCIATED SOILS:
*
Cilla--aquic conditions below 50 cm, no reduced or depleted matrix present, formed in colluvial parent material; shoulders and backslopes of broad hills
*
Pokercreek--gelic soil temperature regime, pH ranges to 5.5, formed in loess and colluvial parent material; footslopes and toeslopes of hills
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
*Drainage class--poorly drained
*Ponding--frequent, brief
*Saturation during normal years--saturated throughout the growing season from a depth of 0 to 25 cm (aquic soil moisture regime)
*Saturated hydraulic conductivity (Ksat)-- high to moderately high throughout the profile
USE AND VEGETATION:
Use--wildlife habitat, recreation, subsistence
Potential native vegetation--purple marshlocks, tealeaf willow, bluejoint, moss, halberd willow, tall Jacob's ladder, Graminoid, Northwest Territory sedge, dwarf raspberry, cloudberry, bog blueberry, sphagnum
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 25 to 100 cm
*Umbric epipedon--zone from 0 to 45 cm
*Aquic conditions--zone from 15 to 150 cm
*Redoximorphic concentrations--zone from 15 to 90 cm
*Reduced matrix--zone from 45 to 150 cm
________________________________________
National Cooperative Soil Survey
U.S.A.