LOCATION UNGIUQ AK
Established Series
SAS/TJR/SJN
02/2022
UNGIUQ SERIES
The Ungiuq series consists of very deep, very poorly drained soils formed in alluvium in drainageways. Slopes range from 0 to 5 percent. The mean annual precipitation is about 700 millimeters and the mean annual air temperature is about 0.5 degrees C.
TAXONOMIC CLASS: Coarse-loamy, isotic, acid Fluvaquentic Cryaquepts
TYPICAL PEDON: Ungiuq mucky silt loam, located in a drainageway on a plain with a slope of 1 percent and elevation of 52 meters; when described on August 12th, 2010 the soil was wet from 15 to 183cm (Colors are for moist soil unless otherwise noted)
Oi--0 to 8 centimeters; peat; nonsticky, nonplastic; many fine and very fine roots, common medium roots, and common coarse roots; very strongly acid, pH 5.0; clear smooth boundary
A1--8 to 15 centimeters; black (10YR 2/1) mucky silt loam; 35 percent sand; 61 percent silt; 4 percent clay; weak medium granular structure; very friable, nonsticky, nonplastic; many very fine roots, common fine roots, common medium roots, and common coarse roots; strongly acid, pH 5.1; clear smooth boundary
Bw--15 to 22 centimeters; brown (10YR 4/3) fine sandy loam; 65 percent sand; 30 percent silt; 5 percent clay; weak medium subangular blocky structure; friable, nonsticky, nonplastic; many fine roots, common medium roots, common coarse roots, and many very fine roots; 25 percent medium strong brown (7.5YR 4/6) masses of oxidized iron with clear boundaries; strongly acid, pH 5.5; clear wavy boundary
A2--22 to 55 centimeters; 20 percent black (7.5YR 2.5/1) and 80 percent very dark grayish brown (10YR 3/2) mucky silt; 12 percent sand; 83 percent silt; 5 percent clay; weak fine subangular blocky structure; friable, nonsticky, nonplastic; common fine roots and common very fine roots; strongly acid, pH 5.3; clear wavy boundary
AC--55 to 110 centimeters; 30 percent very dark brown (7.5YR 2.5/2) and 60 percent olive gray (5Y 4/2) silt loam; 25 percent sand; 71 percent silt; 4 percent clay; weak fine subangular blocky structure; friable, nonsticky, nonplastic; common very fine roots; 10 percent medium brown (7.5YR 4/4) masses of oxidized iron with diffuse boundaries; moderately acid, pH 5.7; gradual smooth boundary
2Cg--110 to 183 centimeters; greenish black (5GY 2.5/1) extremely gravelly loamy sand; 83 percent sand; 14 percent silt; 3 percent clay; single grain; loose, nonsticky, nonplastic; 75 percent nonflat 5 to 75 millimeter fragments; moderately acid, pH 5.9
TYPE LOCATION: Dillingham Census Area, Alaska; 2 kilometers northwest of the Village of New Stuyahok; 59.4602778 degrees north latitude and 157.3405556 degrees west longitude.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature - 0.9 to 2.5 degrees C (cryic soil temperature regime)
Soil moisture control section - Soil is wet within 25 centimeters of the soil surface for much of the growing season in most years (aquic soil moisture regime)
Thickness of cambic horizon - 17 to 80 cm
Depth to reduced matrix - 100 to 110 cm
Depth to aquic conditions - 13 to 22 cm
All mineral horizons-
Reaction - 4.7 to 6.1
Particle-size control section-
Clay content - 3 to 7 percent
Rock fragments - 0 percent
Oe (or Oi) horizon
Thickness - 2 to 8 cm
A1 (or A) horizon
Hue - 7.5YR or 10YR
Value - 2 to 4
Chroma - 1 to 3
Fine earth texture - Mucky silt loam or mucky very fine sandy loam
Clay content - 3 to 7 percent
Reaction - 4.7 to 6.0
Rock fragments - 0 percent
Thickness - 7 to 19 cm
Bw horizon
Hue - 7.5YR or 10YR
Value - 4
Chroma - 2 or 3
Fine earth texture - Fine sandy loam or stratified fine sandy loam
Clay content - 4 to 7 percent
Reaction - 5.5
Rock fragments - 0 percent
Thickness - 7 to 17 cm
A2 horizon (where present)
Hue - 7.5YR or 10YR
Value - 2 to 3
Chroma - 1 or 2
Fine earth texture - Mucky silt or silt loam
Clay content - 3 to 7 percent
Reaction - 5.3 to 5.7
Rock fragments - 0 percent
Thickness - 16 to 33 cm
AC horizon
Hue - 7.5YR to 5Y5Y
Value - 2.5 to 4
Chroma - 1 or 2
Fine earth texture - Silt loam, stratified fine sandy loam, or stratified silt loam
Clay content - 3 to 7 percent
Reaction - 4.8 to 5.7
Rock fragments - 0 percent
Thickness - 45 to 81 cm
2Cg horizon
Hue - 10YR to 5GY
Value - 2 to 4
Chroma - 1 or 2
Fine earth texture - Loamy sand, stratified sandy loam, stratified silt, or silt loam
Clay content - 3 to 7 percent
Reaction - 4.8 to 6.1
Rock fragments - 0 to 75 percent total; 0 to 75 percent subrounded coarse and medium gravels, and 0 to 3 percent subrounded fine gravels
Thickness - 139 to 162 cm
COMPETING SERIES: There are no competing series
GEOGRAPHIC SETTING:
Parent material - Organic material over coarse-loamy alluvium over gravelly alluvium
Landform - Drainageways on plains
Slope - 0 to 5 percent
Elevation - 6 to 107 meters
Climate - Cool summers, cold winters, August and September are the wettest months
Mean annual precipitation - 606 to 781 mm
Mean annual air temperature - 0.2 to 0.7 degrees C
Frost free duration - 85 to 140 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Ekwok - No aquic soil conditions, rises and talfs on plains
Klutuk - No aquic soil conditions, hills and plains
Orgter - Formed in mossy organic parent material, terraces
Rolph - No aquic soil conditions, hills and plains
Flounder - Formed in colluvial and glacial parent material, bluffs
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: (Ksat)
Drainage class - Very poorly drained
Saturation in normal years - Within 25 cm of the soil surface
Flooding - Frequent and long
Ponding - None
Ksat - Moderately high to high throughout the soil profile
USE AND VEGETATION:
Use - Wildlife habitat
Potential natural vegetation - Western maritime open scrubland composed of willow, with an understory of bog blueberry, bluejoint grass, and horsetail
DISTRIBUTION AND EXTENT: Bristol Bay Lowlands; MLRA 236; small extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: WASILLA, ALASKA
SERIES ESTABLISHED: Nushagak-Mulchatna Watershed Soil Survey, Dillingham Census Area, Alaska, 2019
REMARKS:
Particle-size control section - 33 to 108 cm
Ochric epipedon
Soil moisture regime - Aquic
Cambic horizon - Bw and A2 horizons
Aquic soil conditions - All mineral horizons
Redox concentrations - Bw and AC horizons
National Cooperative Soil Survey
U.S.A.