LOCATION DEBAUCH                 AK

Established Series
SWD/MPS
11/2024

DEBAUCH SERIES

Depth class: shallow to paralithic bedrock
Drainage class: well drained
Parent material: gravelly loamy residuum weathered from mudstone
Landscape: mountains
Landform: ridges
Slopes: 1 to 20 percent
Mean annual precipitation: about 500 mm (20 in)
Mean annual air temperature: about -4 degrees C. (25 degrees F.)
Frost-free period: 70 to 90 days

TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, nonacid, subgelic, shallow Typic Gelorthents

TYPICAL PEDON: Debauch extremely cobbly silt loam in a dryas lichen alpine community on a convex, convex summit on a slope of 5 percent at an elevation of 564 m (1850 ft)

Oe--0 to 5 cm (0.0 to 2.0 in); moderately decomposed plant material; very dark brown (10YR 2/2) broken face moist, dark grayish brown (10YR 4/2) broken face dry; common very fine, fine, and few medium roots throughout; 5 percent gravel; noneffervescent; neutral (pH 6.7); abrupt smooth boundary. (1 to 6 cm, 0.3 to 2 in thick)

C--5 to 45 cm (2.0 to 18 in); extremely cobbly silt loam; dark olive brown (2.5Y 3/3) broken face moist, light olive brown (2.5Y 5/3) broken face dry; massive; friable, slightly hard, nonsticky, nonplastic; nonfluid; few very fine and fine throughout, and common medium roots top of horizon; common very fine irregular pores; 11 percent gravel, 50 percent cobbles; noneffervescent; moderately acid (pH 5.6); clear wavy boundary. (30 to 45 cm, 12 to 18 in thick)

Cr--45 to 70 cm (18 to 28 in); weakly to moderately coherent mudstone bedrock.

TYPE LOCATION: Nulato Hills - Continental Divide and Blackburn Hills Soil Survey Area, Alaska; latitude64.3980730, longitude -160.1984182, datum WGS84, UTM north 7141918.72 and UTM east 442220.76, zone 4, datum WGS84.

RANGE IN CHARACTERISTICS:

Soil moisture regime: udic
Soil temperature regime: gelic
Mean annual soil temperature: -1 to 0 degrees C. (30 to 32 degrees F.)
Thickness of organic material: 1 to 6 cm (0.3 to 2 in)
Thickness of ochric epipedon: 1 to 6 cm (0.3 to 2 in)
Depth to paralithic contact: 20 to 50 cm (8 to 20 in)

Oe horizon:
Hue: 7.5YR or 10YR
Value: 2 or 2.5 moist, 4 dry
Chroma: 1 or 2
Texture: moderately decomposed material
Organic matter: 60 to 90 percent
Reaction class: moderately acid to neutral (pH 5.6 to 7.3)

C horizon:
Hue: 7.5YR or 10YR
Value: 3 or 4 moist, 5 or 6 dry
Chroma: 1 to 3
Texture: silt loam or its gravelly or cobbly analogues
Sand: 5 to 45 percent
Silt: 50 to 83 percent
Clay: 3 to 12 percent
Rock fragments: 35 to 75 percent
Gravels: 5 to 30 percent
Cobbles: 20 to 50 percent
Organic matter: 0.5 to 3 percent
Reaction class: moderately acid to neutral (pH 5.6 to 7.3)

Cr horizon
Weakly to moderately coherent mudstone bedrock.

COMPETING SERIES: There are no competing series.

GEOGRAPHIC SETTING:
Elevation: 300 to 1000 meters (985 to 3280 feet)
Parent material: gravelly loamy residuum weathered from mudstone
Landform: ridges
Slopes: 1 to 20 percent
Mean annual precipitation: 400 to 600 mm (16 to 24 in)
Mean annual air temperature: -6 to -1 degrees C. (21 to 30 degrees F.)
Frost free period: 70 to 90 days

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Apkun, Ingik, Iyyagrik, Kanik, Savik, Ugguktuk, Uniat soils.
Apkun soils have a lithic contact between 50 to 100 cm (20 to 40 in), have a umbric epipedon, have an acid reaction class, and occur on mountainflanks, center third and upper third
Ingik soils have a paralithic contact between 50 to100 cm (20 to 40 in), have a cryic soil temperature regime, and occur on mountainflanks, upper third
Iyyagrik soils have a lithic contact between 100 to 150cm (40 to 60 in), have a mollic epipedon, have a cryic soil temperature regime, and occur on mountainflanks, upper third
Kanik soils have a lithic contact between 100 to 150cm (40 to 60 in), and occur on mountainflanks, center third and upper third
Savik soils have an umbric epipedon, have a fragmental particle size class, and occur on nose slopes and mountainflanks, upper third
Ugguktuk soils have a lithic contact between 50 to 100 cm (20 to 40 in), have aquic conditions starting between 25 to 50 cm (10 to 20 in), have a reduced matrix within 50 cm (20 in), have a cambic horizon, have a cryic soil temperature regime, have an acid reaction class, and occur on similar landforms on ridges and saddles
Uniat soils have a lithic contact between 100 to 150 cm (40 to 60 in), have a cambic horizon, have a cryic soil temperature regime, have a fragmental particle size class, and occur on mountainbases, mountaintops, and mountainflanks, upper third

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class: well drained
Saturated Hydraulic Conductivity: very high in the Oe horizon and moderately high to high in the C horizon
Permeability: rapid to very rapid in the Oe horizon and moderate in the C horizon
Runoff: very high

USE AND VEGETATION:
Use: wildlife habitat, recreation, and subsistence
Native vegetation: eightpetal mountain-avens, reindeer lichen, greygreen reindeer lichen, witch's hair lichen, Flavocetraria nivalis, Flavocetraria cucullate, island cetraria lichen, snow lichen, whiteworm lichen, golden asahinea lichen, star reindeer lichen, moss, Bigelow's sedge, alpine sweetgrass, skeletonleaf willow, dwarf birch, sphagnum, common woodrush, polytrichum moss, blackish oxytrope

DISTRIBUTION AND EXTENT: MLRA 240, Nulato Hills-Southern Seward Peninsula Highlands. The series is of moderate extent.

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Wasilla, Alaska

SERIES ESTABLISHED: Nulato Hills - Continental Divide and Blackburn Hills Soil Survey, Alaska, 2024.

REMARKS: Diagnostic features and horizons recognized in this profile include:

Particle-size control section: 30 to 45 cm (12 to 18 in)

Ochric epipedon: 0 to 5 cm (0 to 2 in) (Oe horizon)

Paralithic contact: 45 to 70 cm (18 to 28 in) (Cr horizon)

ADDITIONAL DATA:

User pedon ID: 2021AK180852

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National Cooperative Soil Survey
U.S.A.