LOCATION ONGIVINUCK AK
Established Series
SAS/TJR/MPR
05/2022
ONGIVINUCK SERIES
Landscape--mountain valleys
Landform--stream terraces
Slope--0 to 2 percent
Parent material--alluvium with volcanic ash influence in the upper part
Mean annual precipitation--about 1100 mm
Mean annual air temperature--about 0 degrees C
Depth class--very deep
Drainage class--well drained
Soil moisture regime--udic
Soil temperature regime--cryic
Soil moisture subclass--typic
TAXONOMIC CLASS: Sandy-skeletal, isotic Andic Humicryepts
TYPICAL PEDON: Ongivinuck silt on a 1-percent slope of a terrace tread at an elevation of 266 m (The soil was moist throughout when described on July 24, 2012.)
Oe--0 to 5 cm; moderately decomposed plant material; nonsticky and nonplastic; common fine and many very fine roots; strongly acid (pH 5.4); clear smooth boundary
A--5 to 15 cm; silt, matrix color 89 percent dark gray (7.5YR 4/1) dry, black (7.5YR 2.5/1) moist, and 10 percent brown (7.5YR 5/2) dry, dark brown (7.5YR 3/2) moist; weak medium granular structure; slightly hard, friable, nonsticky and nonplastic; many very fine and common fine, medium, and coarse roots; 1 percent medium masses of oxidized iron, dark brown (7.5YR 3/4) moist; 5 percent gravel; strongly acid (pH 5.1); clear wavy boundary
Bw--15 to 39 cm; medial silt loam, matrix color 75 percent brown (10YR 5/3) dry, dark brown (10YR 3/3) moist, and 25 percent reddish yellow (7.5YR 6/6) dry, strong brown (7.5YR4/6) moist; weak thick platy structure; soft, very friable, nonsticky and nonplastic; common very fine to medium roots; 5 percent gravel; moderately acid (pH 5.7); clear wavy boundary
2BC--39 to 66 cm; extremely gravelly coarse sandy loam, brown (10YR 5/3) dry, dark brown (10YR 3/3) moist; weak fine granular structure; soft, very friable, nonsticky and nonplastic; common very fine roots; 65 percent gravel; strongly acid (pH 5.5); gradual smooth boundary
2C--66 to 150 cm; extremely gravelly coarse sand, brown (10YR 5/3) dry, dark brown (10YR 3/3) moist; single grain; loose, nonsticky and nonplastic; 75 percent gravel; strongly acid (pH 5.5)
TYPE LOCATION: Dillingham Census Area, Alaska, about 115 km north-northwest of the city of Dillingham; latitude 59.9171422 degrees north, longitude 159.5024662 degrees west, datum WGS 84 (coordinates determined with a GPS)
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 moisture regime)
Other features--umbric epipedon; andic soil properties; cambic horizon; lithologic discontinuity
Layers that have andic soil properties
*Thickness--18 to 29 cm
*Phosphorous retention--85 to 100 percent
*Bulk density--0.45 to 0.9 g/cm3
*Ammonium oxalate Al plus 1/2 Fe--2 to 4 percent
*Volcanic glass content--10 to 50 percent
Particle-size control section
*Clay content--0 to 5 percent
*Sand content--85 to 100 percent
*Total rock fragment content--35 to 85 percent
*Sodium fluoride pH--8.4 to 11.6
*Ratio of 1500 kPa water to measured clay--0.6 to 6.0
Oe horizon
Thickness--2 to 10 cm
A horizon
Hue--7.5YR, 10YR
Value--2 to 4 moist, 4 to 6 dry
Chroma--1 to 3 moist
Fine-earth texture--silt, sandy loam, very fine sandy loam
Clay content--4 to 10 percent
Reaction--5.0 to 6.0
Gravel content--0 to 5 percent
Thickness--5 to 14 cm
Base saturation--0 to 25 percent
Bw horizon
Hue--7.5YR, 10YR
Value--3 to 5 moist, 5 to 7 dry
Chroma--3 to 8 moist
Fine-earth texture--medial silt loam, medial very fine sandy loam, medial fine sandy loam
Clay content--3 to 10 percent
Reaction--5.0 to 6.3
Gravel content--0 to 15 percent
Thickness--18 to 34 cm
Bulk density--0.6 to 0.9 g/cm3
Phosphorous retention--95 to 100 percent
Base saturation--0 to 25 percent
Volcanic glass content--10 to 40 percent
2BC horizon
Chroma--1 to 4
Fine earth texture--coarse sandy loam, coarse sand, sandy loam
Clay content--0 to 5 percent
Reaction--5.8 to 6.5
Total rock fragment content--60 to 89 percent
Gravel content--60 to 85 percent
Cobble content--0 to 10 percent
Thickness--5 to 45 cm
2C horizon
Hue--2.5Y, 10YR
Value--1 to 4 moist, 3 to 6 dry
Chroma--3 or 4 moist
Clay content--0 to 5 percent
Reaction--5.8 to 6.5
Total rock fragment content--60 to 85 percent
Gravel content--60 to 85 percent
Cobble content--0 to 10 percent
Thickness--more than 71 cm
COMPETING SERIES:
None
GEOGRAPHIC SETTING:
Elevation--5 to 560 m
Climate--warm, moist summers; cold, moist winters
Mean annual precipitation--580 to 2000 mm
Mean annual air temperature-- -2.5 to 1.6 degrees C
Frost-free period--75 to 140 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Nimgun--aquic conditions throughout; fens on plains
Nolake--aquic conditions throughout; dips on plains
Kanektok--andic soil properties more than 35 cm thick; outwash terraces
Longarm--aquic conditions below a depth of 14 cm; ochric epipedon; flood plains
Awayak--frequent flooding; ochric epipedon; flood plains
Ungalikthluk--occasional flooding; ochric epipedon; flood plains
Aukamunuk--aquic conditions throughout; flood plains
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Saturation in normal years--below a depth of 150 cm, except between depths of 2 and 21 cm during spring melt, usually in April
Flooding--rare
Ponding--none
Saturated hydraulic conductivity (Ksat)--moderately high or high in the A and Bw horizons; high or very high in the 2BC and 2C horizons
USE AND VEGETATION:
Use--wildlife habitat, recreation, subsistence
Potential natural vegetation--bluejoint, fireweed, field horsetail, woolly geranium, splendid feather moss, Schreber's big red stem moss, arctic raspberry, Barclay's willow, Canadian burnet, tealeaf willow
DISTRIBUTION AND EXTENT: Ahklun Mountains, Alaska; MLRA 237; moderate extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: WASILLA, ALASKA
SERIES ESTABLISHED: Togiak National Wildlife Refuge, Dillingham Census Area, Alaska; 2019
REMARKS:
Diagnostic horizons and other features in this pedon
*Particle-size control section--zone from 30 to 105 cm
*Umbric epipedon--zone from 5 to 39 cm
*Andic soil properties--Bw horizon
*Cambic horizon--Bw horizon
*Redoximorphic concentrations--A horizon
See laboratory pedon number 13N0047, layer 13N00122, for a Bw horizon that has andic soil properties.
National Cooperative Soil Survey
U.S.A.