LOCATION IGNIQ AK
Tentative Series
MPS
10/2024
IGNIQ SERIES
Depth class: very deep
Drainage class: somewhat poorly drained
Parent material: mossy organic material over loamy slope alluvium over organic material and/or loamy slope alluvium derived from sedimentary rock
Landscape: hills
Landform: hillslopes
Slopes: 3 to 20 percent
Mean annual precipitation: about 400 mm (16 in)
Mean annual air temperature: about -5 degrees C. (23 degrees F.)
Frost-free period: 65 to 85 days
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, nonacid, subgelic Turbic Gelaquepts
TYPICAL PEDON: Igniq slightly decomposed material in a sedge and willow scrubland boreal community on a northwest facing linear, linear footslope on a slope of 14 percent at an elevation of 129m (423 ft)
Oi--0 to 8 cm (0 to 3 in); slightly decomposed plant material; very dark brown (10YR 2/2) broken face moist, dark grayish brown (10YR 4/2) broken face dry; many very fine, fine, and medium roots throughout; neutral (pH 7.2); clear smooth boundary. (5 to 10 cm, 2 to 4 in thick)
Oe--8 to 23 cm (3 to 9 in); moderately decomposed plant material; black (10YR 2/1) broken face moist, dark gray (10YR 4/1) broken face dry; many very fine, fine, and few medium roots throughout; neutral (pH 6.9); clear broken boundary. (10 to 16 cm, 4 to 6 in thick)
Oe/Oijj--23 to 33 cm (9 to 13 in); moderately decomposed plant material; 70 percent very dark brown (10YR 2/2) broken face and 30 percent very dark grayish brown (10YR 3/2) broken face moist, 70 percent dark grayish brown (10YR 4/2) broken face and 30 percent grayish brown (10YR 5/2) broken face dry; common very fine roots throughout; slightly acid (pH 6.4); clear broken boundary. (5 to 12 cm, 2 to 5 in thick)
Cg--33 to 90 cm (13 to 35 in); silt loam; dark gray (10YR 4/1) broken face moist, gray (10YR 6/1) broken face dry; massive; friable, slightly hard, slightly sticky, nonplastic; nonsmeary; common very fine roots throughout; common very fine dendritic tubular pores; 20 percent coarse distinct irregular dark yellowish brown (10YR 4/4), moist, masses of oxidized iron; positive to alpha-alpha dipyridyl measured in matrix; noneffervescent; very strongly acid (pH 4.9); gradual smooth boundary. (30 to 120 cm, 12 to 47 in thick)
Cg/Oejj--90 to 200 cm (35 to 79 in); fine sandy loam and mucky peat; 90 percent greenish gray (10Y 5/1) broken face and 10 percent black (10YR 2/1) broken face moist, 90 percent dark greenish gray (10Y 3/1) broken face and 10 percent dark gray (10YR 4/1) broken face dry; massive; friable, slightly hard, slightly sticky, nonplastic; nonsmeary; few very fine irregular pores; 15 percent coarse prominent irregular dark yellowish brown (10YR 4/4), moist, masses of oxidized iron; positive to alpha-alpha dipyridyl measured in matrix surrounding redox concentrations; noneffervescent; moderately acid (pH 5.9).
TYPE LOCATION: Nulato Hills - Continental Divide and Blackburn Hills Soil Survey Area, Alaska; latitude 65.2245720, longitude -160.2052970, datum WGS84, UTM north 7234021.31 and UTM east 443642.53, zone 4, datum WGS84.
RANGE IN CHARACTERISTICS:
Soil moisture regime: aquic
Soil temperature regime: gelic
Mean annual soil temperature: -1 to 0 degrees C. (30 to 32 degrees F.)
Thickness of folistic epipedon: 20 to 38 cm (8 to 15 in)
Thickness of cryoturbation: 47 to 162cm (19 to 64 in)
Depth to redoximorphic concentrations: 25 to 38 cm (10 to 15 in)
Depth to reduced matrix: 25 to 38 cm (10 to 15 in)
Depth to aquic conditions: 25 to 38cm (10 to 15 in)
Oi, Oe, Oe/Oijj horizons:
Hue: 10YR
Value: 2 or 3 moist, 4 or 5 dry
Chroma: 1 or 2
Texture: slightly decomposed material and moderately decomposed material
Organic matter: 60 to 90 percent
Reaction class: slightly acid to neutral (pH 6.1 to 7.3)
Cg horizon:
Hue: 10YR, 10Y, or 5GY
Value: 3 or 4 moist, 5 or 6 dry
Chroma: 1 or 2
Texture: silt loam, loam, sandy loam
Sand: 15 to 60 percent
Silt: 24 to 79 percent
Clay: 6 to 16 percent
Organic matter: 0.4 to 2 percent
Reaction class: very strongly acid to moderately acid (pH 4.5 to 6.0)
Cg/Oejj horizon:
Hue: 10YR, 10Y, or 5GY
Value: 3 or 4 moist, 5 or 6 dry
Chroma: 1 or 2
Texture: silt loam, loam, sandy loam
Sand: 20 to 80 percent
Silt: 3 to 74 percent
Clay: 6 to 17 percent
Organic matter: 0.4 to 3 percent
Reaction class: moderately acid to neutral (pH 5.6 to 7.3)
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING:
Elevation: 100 to 375 meters (325 to 1230 feet)
Parent material: mossy organic material over loamy slope alluvium over organic material and/or loamy slope alluvium derived from sedimentary rock
Landform: hillslopes
Slopes: 3 to 20 percent
Mean annual precipitation: 300 to 500 mm (12 to 20 in)
Mean annual air temperature: -7 to -2 degrees C. (19 to 28 degrees F.)
Frost free period: 65 to 85 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Jacksoncreek, Kaluk, Quammaqik, Tikigak, and Uvluutit soils.
Jacksoncreek soils have aquic conditions starting between 0 to 25 cm (0 to 10 in), have a histic epipedon, have a cambic horizon, have an acid reaction class, have an isotic mineralogy, and occur on earth hummocks on terraces and terraces
Kaluk soils have a sandy-skeletal particle size class, lack an organic surface, lack cryoturbation, lack aquic conditions, have a cryic soil temperature regime, have frequent, brief flooding, and occur on point bars on floodplains
Quammaqik soils have aquic conditions starting between 0 to 25 cm (0 to 10 in), have a mollic epipedon, have a cryic soil temperature regime, have a calcic horizon, have free carbonates throughout the soil profile, have marl at the soil surface, and occur on fens
Tikigak soils have a mollic epipedon, have a cambic horizon, have a fine-loamy particle size class, lack aquic conditions, and occur on similar landforms on side slopes
Uvluutit soils have a lithic contact between 50 to 100 cm (25 to 40 in), have an ochric epipedon, have a cambic horizon, have a loamy-skeletal particle size class, have a cryic soil temperature regime, have free carbonates within 50 cm (20 in), lack aquic conditions, and occur on similar landforms on side slopes
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class: somewhat poorly drained
Saturation during normal years: saturated at a depth of between 25 and 50 cm (10 and 20 in) for at least two weeks during the growing season
Saturated Hydraulic Conductivity: very high in the Oi, Oe, and Oe/Oijj horizons, moderately high to high in the Cg horizon, and moderately low to high in the Cg/Oejj horizon
Permeability: rapid to very rapid in the Oi, Oe, and Oe/Oijj horizons, moderate to rapid in the Cg horizon, and very slow to moderate in the Cg/Oejj horizon
Runoff: very high
USE AND VEGETATION:
Use: wildlife habitat, recreation, and subsistence
Native vegetation: Bigelow's sedge, sphagnum, dwarf birch, cloudberry, tealeaf willow, bog blueberry, marsh Labrador tea, splendid feather moss, Schreber's big red stem moss, lingonberry, moss, aulacomnium moss, black crowberry, dwarf scouringrush
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: 58 to 133 cm (23 to 52 in)
Folistic epipedon: 0 to 33 cm (0 to 13 in) (Oi, Oe, and Oe/Oijj horizons)
Cryoturbation: 23 to 33 cm (9 to 13 in) (Oe/Oijj horizon)
Reduced matrix: 33 to 200 cm (13 to 79 in) (Cg and Cg/Oejj horizons)
Redoximorphic concentrations: 33 to 200 cm (13 to 79 in) (Cg and Cg/Oejj horizons)
Cryoturbation: 90 to 200 cm (35 to 79 in) (Cg/Oejj horizon)
Aquic conditions: 33 to 200 cm (13 to 79 in) (Cg and Cg/Oejj horizons)
ADDITIONAL DATA:
User pedon ID: 2023AK290311
National Cooperative Soil Survey
U.S.A.