LOCATION BONASILAFAMILY AK
Tentative Series
Rev. JPM
02/2022
BONASILAFAMILY SERIES
Note: Used as a placeholder series until a series is established under the family class
Depth class: Very deep
Drainage class: well drained
Parent material: loess, alluvium, and colluvium
Landform: floodplains, terraces, and hillslopes
Slopes: 1 to 20 percent
Mean annual precipitation: about 16 inches
Mean annual temperature: about 29 degrees F.
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive Typic Haplocryepts
TYPICAL PEDON: Bonasilafamily silt loam - on a slope of 2 percent on a terrace at 215 feet elevation. (All colors are for moist soil unless noted)
Oe--0 to 2 inches (0 to 5 cm); moderately decomposed organic matter; many very fine, fine, and medium roots, common coarse roots; strongly acid, pH 5.6; abrupt wavy boundary.
E--2 to 4 inches (5 to 9 cm) very dark gray (10YR 3/1) very fine sandy loam; moderate very fine granular structure; friable, nonsticky, nonplastic; common very fine, fine, medium, and coarse roots; strongly acid, pH 5.2; abrupt wavy boundary.
Bw1--4 to 14 inches (9 to 36 cm); 30 percent dark brown (7.5YR 3/4) and 70 percent brown (10YR 4/3) very fine sandy loam; weak fine subangular blocky parting to weak fine granular structure; very friable, nonsticky, nonplastic; common very fine, fine, and medium roots, few coarse roots; slightly acid, pH 6.3; clear wavy boundary.
Bw2--14 to 30 inches (36 to 75 cm); 20 percent grayish brown (10YR 5/2) and 80 percent brown (10YR 4/3) very fine sandy loam; weak medium subangular blocky structure; very friable, nonsticky, nonplastic; few very fine and fine roots, common medium roots, few coarse roots; slightly acid, pH 6.3; clear wavy boundary.
C1--30 to 63 inches (75 to 160 cm); 10 percent light olive brown (2.5Y 5/3) and 90 percent olive brown (2.5Y 4/4) very fine sandy loam; massive; very friable, nonsticky, nonplastic; few very fine, fine roots, medium, and coarse roots; slightly acid, pH 6.2; gradual wavy boundary.
2C--63 to 75 inches, (160 to 190 cm); olive (5Y 5/3), fine sandy loam; massive; very friable, nonsticky, nonplastic; few very fine, fine, medium, and coarse roots; slightly acid, pH 6.5.
TYPE LOCATION: Western Interior Rivers Soil Survey Area, Alaska; near Anvik; UTM north 6951043 and UTM east 438276, zone 4.
RANGE IN CHARACTERISTICS:
Soil moisture regime: Udic
Mean annual soil temperature: 32 to 34 degrees F
Depth to 2C horizons: 30 to greater than 60 inches
O horizons:
Matrix color: hue 10YR, 7.5YR, or 5YR, value 2 or 3, chroma 1 to 4
Texture: slightly or moderately decomposed organic matter
Reaction Class: extremely acid to strongly acid
A horizons: absent in some pedons
Matrix color: hue 10YR or 7.5YR; value 2 or 3; chroma 2 or 3
Texture: silt loam or silt
Reaction Class: extremely acid to strongly acid
B horizons:
Matrix color: hue 2.5Y, 10YR or 7.5YR; value 2 to 5; chroma 2 to 6
Texture: silt loam or very fine sandy loam
Reaction Class: very strongly to moderately acid
Rock fragments: 0 to 20 percent gravels and channers
C horizons:
Matrix color: hue 5Y, 2.5Y, or 10YR; value 4; chroma 2 to 4
Texture: silt loam or very fine sandy loam
Reaction Class: strongly acid to slightly acid
Rock fragments: 0 to 10 percent
2C horizons (when present)
Matrix color: 2.5Y or 10YR; value 4 or 5; chroma 3 to 6
Texture: silt loam, loam, sandy loam, or very fine sandy loam
Reaction Class: strongly acid to moderately acid
Rock fragments: 25 to 45 percent gravel and channers
COMPETING SERIES: These are no series in this family. When a series is established, this series placeholder will be dropped (see REMARKS).
GEOGRAPHIC SETTING:
Parent material: loess, alluvium, and colluvium
Landform: floodplains, terraces, and hillslopes
Slope: 1 to 20 percent
Mean annual temperature: 28 to 30 degrees F.
Mean annual precipitation: 15 to 18 inches
GEOGRAPHICALLY ASSOCIATED SOILS: These include Haplocryods on hillslopes and Histosols in depressional areas.
DRAINAGE AND PERMEABILITY: Well drained. Medium to high runoff. Permeability is moderate.
USE AND VEGETATION: Used for subsistence and wildlife habitat. The native vegetation is typical of Boreal scrub, forest, and woodland; and alpine scrub.
DISTRIBUTION AND EXTENT: MLRA 229 - Interior Alaska Lowlands; MLRA 230 - Yukon-Kuskokwim Highlands; and MLRA 238- Yukon-Kuskokwim Coastal Plain, Alaska. The soil is extensive.
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: WASILLA, ALASKA
SERIES PROPOSED: The Western Interior Rivers Area, Alaska, 2007
REMARKS: This series is set-up as a placeholder to allow the use of a short family name. The range in characteristics is broader than a typical series and may even encompass the full range of the family. There are currently no series designated in this soil family.
Diagnostic features and horizons recognized in this profile include:
Mineral horizons: from 2 to 75 inches.
Temperature regime: Cryic
Moisture regime: Udic
Cambic horizon: 4 to 30 inches
National Cooperative Soil Survey
U.S.A.