LOCATION TUNRAVIK AK
Established Series
SAS/TJR/SJN
02/2022
TUNRAVIK SERIES
The Tunravik series consists of very deep, well drained soils formed in eolian deposits over alluvium on terrace treads. Slopes range from 0 to 3 percent. Mean annual precipitation is about 750 millimeters and the mean annual air temperature is about 0.6 degrees C.
TAXONOMIC CLASS: Coarse-loamy over sandy or sandy-skeletal, isotic over mixed Typic Dystrocryepts
TYPICAL PEDON: Tunravik highly organic silt loam, located on a terrace tread with a slope of 1 percent and elevation of 31 meters; when described on July 31st, 2006 the soil was moist throughout (Colors are for moist soil unless otherwise noted)
Oi--0 to 7 centimeters; slightly decomposed plant material; few very fine and fine roots, few medium roots, and few coarse roots; extremely acid, pH 4.0; abrupt smooth boundary
A--7 to 16 centimeters; very dark gray (5YR 3/1) highly organic silt loam; 26 percent sand; 67 percent silt; 7 percent clay; weak medium subangular blocky structure parts to weak thin platy structure; nonsticky, nonplastic; few very fine and fine roots, few medium roots, and few coarse roots; very strongly acid, pH 4.8; clear wavy boundary
Bw--16 to 60 centimeters; 50 percent brown (7.5YR 4/4) and 50 percent olive brown (2.5Y 4/3) silt loam; 35 percent sand; 60 percent silt; 5 percent clay; weak medium subangular blocky structure parts to weak thin platy structure; nonsticky, nonplastic; few very fine and fine roots, few medium roots, and few coarse roots; moderately acid, pH 5.6; abrupt smooth boundary
2C--60 to 183 centimeters; dark grayish brown (2.5Y 4/2) extremely gravelly coarse sand; 97 percent sand; 1 percent silt; 2 percent clay; single grain structure; nonsticky, nonplastic; few very fine and fine roots, few medium roots, and few coarse roots; 73 percent nonflat 5 to 76 millimeter fragments and 2 percent nonflat 2 to 5 millimeter fragments; moderately acid, pH 5.6
TYPE LOCATION: Dillingham Census Area, Alaska. 1 kilometer north of the Village of Ekwok, Alaska; 59.3577778 degrees north latitude, 157.4863889 degrees west longitude.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature - 0.5 to 1.7 degrees C (cryic soil temperature regime)
Soil moisture control section - Dry less than 45 consecutive days from June to October (udic soil moisture regime)
Thickness of cambic horizon - 35 to 71 cm
All mineral horizons-
Reaction - 4.1 to 6.2
Particle-size control section-
Clay content - 1 to 7 percent
Rock fragments - 0 to 75 percent
Oi horizon
Thickness - 7 to 16 cm
A horizon
Hue - 5YR to 10YR
Value - 2 to 3
Chroma - 1 or 2
Fine earth texture - Highly organic silt loam or highly organic silt
Clay content - 5 to 8 percent
Reaction - 4.1 to 5.5
Rock fragments - 0 percent
Thickness - 3 to 16 cm
Bw horizon
Hue - 7.5YR to 2.5Y
Value - 3 to 5
Chroma - 3 or 4
Fine earth texture - Very fine sandy loam, fine sandy loam, or silt loam
Clay content - 4 to 7 percent
Reaction - 4.9 to 6.0
Rock fragments - 0 to 5 percent total; 0 to 5 percent subrounded medium and coarse gravels, and 0 to 3 percent subrounded fine gravels
Thickness - 35 to 71 cm
2C horizon
Hue - 10YR or 2.5Y
Value - 3 or 4
Chroma - 2 or 3
Fine earth texture - Coarse sand, loamy fine sand, or sand
Clay content - 1 to 6 percent
Reaction - 5.3 to 6.2
Rock fragments - 0 to 75 percent total; 0 to 73 percent subrounded medium and coarse gravels, and 0 to 3 percent subrounded fine gravels
Thickness - 113 to 187 cm
COMPETING SERIES:
Kokwok - Rare flooding, flood plain soil formed in alluvium
GEOGRAPHIC SETTING:
Parent material - Organic material over coarse-loamy eolian deposits over sandy and gravelly alluvium
Landform - Terrace treads
Slope - 0 to 2 percent
Elevation - 15 to 111 meters
Climate - Cool summers; cold winters, August and September are the wettest months
Mean annual precipitation - 608 to 873 mm
Mean annual air temperature - 0.3 to 0.7 degrees C
Frost free duration - 85 to 140 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Klutuk - No alluvium present; rises and talfs on plains, and hills
Wearyriver - Very poorly drained; dips on plains
Snakeriver - Very poorly drained; flood plains
Iowithla - No eolian parent material present; flood plains
Kokwok - No eolian parent material present; flood plains
Ekwok - No alluvium present, spodic horizon present; rises on plains, and hills
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: (Ksat)
Drainage class - Well drained
Saturation in normal years - None
Ksat - Moderately high in the eolian parent material, and high to very high in the alluvial parent material
USE AND VEGETATION:
Use - Wildlife habitat, hunting, berry picking, and forestry resources
Potential natural vegetation - Boreal white spruce woodland with an understory composed of lingonberry, black crowberry, marsh Labrador tea, bog blueberry, feathermoss, and lichens
DISTRIBUTION AND EXTENT: Bristol Bay Lowlands, Alaska; MLRA 236; small extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: WASILLA, ALASKA
SERIES ESTABLISHED: Nushagak Mulchatna Watershed, Dillingham Census Area, Alaska, 2019
REMARKS:
Particle-size control section - 32 to 107 cm
Ochric epipedon
Soil moisture regime - Udic
Cambic horizon - Bw horizon
National Cooperative Soil Survey
U.S.A.