LOCATION BROWNE AK
Established Series
Rev. DKM/DLM
02/2022
BROWNE SERIES
Depth class: moderately deep
Drainage class: poorly drained
Parent material: loess and alluvium
Landform: alluvial fans
Slopes: 0 to 2 percent
Mean annual precipitation: about 11 inches, 280 mm
Mean annual temperature: about 25 degrees F., -4 degrees C.
TAXONOMIC CLASS:
TYPICAL PEDON: Browne silt loam - on a slope of 0 percent under stunted black spruce forest at 650 feet elevation. (All colors are for moist soil unless noted)
Oi--0 to 5 inches, (0 to 12 cm); brown (7.5YR 4/3); slightly decomposed plant material; many very fine to coarse roots; very strongly acid (pH 4.7); abrupt smooth boundary.
Oe--5 to 6 inches, (12 to 16 cm); very dark gray (10YR 3/1); moderately decomposed plant material; many very fine to coarse roots; strongly acid (pH 5.2); abrupt smooth boundary. (The combines thickness of the O horizons 3 to 7 inches thick)
A--6 to 7 inches, (16 to 18 cm); very dark grayish brown (10YR 3/2); silt loam; weak medium granular structure; very friable, slightly sticky, slightly plastic; many very fine to medium few coarse roots; strongly acid (pH 5.3); abrupt smooth boundary. (1 to 2 inches thick)
Bjjg--7 to 24 inches, (18 to 62 cm); light olive brown (2.5Y 5/4); silt loam; weak medium subangular blocky structure; friable, slightly sticky, slightly plastic; common fine and very fine and few medium roots; 10 percent fine and medium strong brown (7.5YR 5/6) redoximorphic concentrations and 30 percent medium and coarse reddish gray (2.5YR 5/1) redoximorphic depletions; neutral (pH 6.6); clear smooth boundary. (16 to 83 inches thick)
Bgf--24 to 72 inches, (62 to 183 cm); permanently frozen material.
TYPE LOCATION: Greater Nenana Area, Alaska; about 11 miles south west of Anderson; in the NW 1/4 of the SW 1/4, section 20, T. 8 S., R. 8 W.; Fairbanks (A-5) 1:63,360 quad; Fairbanks Meridian; UTM north 7121822 and UTM east 393585, zone 6.
RANGE IN CHARACTERISTICS:
Particle-size control (section weighted average):
Percent clay in the control section: 5 to 13 percent
Soil moisture regime: aquic
Mean annual soil temperature: 26 degrees F., 50 cm
Thickness of organic materials: 3 to 7 inches, 9 to 18 cm
Texture of the loess and alluvium mantle: silt loam or silt
Percent clay in the loess and alluvium mantle: 5 to 13 percent
Thickness of redoximorphic concentrations: from 7 to 72 inches, 18 to 183 cm.
Thickness of redoximorphic depletions: from 7 to 72 inches, 18 to 183 cm.
Thickness of cryoturbation and gelic materials: from 7 to 72 inches, 18 to 183 cm.
Depth to Permafrost: from 11 to 38 inches, 28 to 99 cm.
O horizon:
Matrix color: hue of 5YR to 10YR; value of 2 to 4; chroma of 1 to 3
Texture: Slightly or moderately decomposed plant material
Reaction class: Extremely acid to slightly acid
A horizon:
Matrix color: hue of 10YR or 2.5Y; value of 2 or 3; chroma of 1 or 2
Texture: silt loam or silt
Reaction class: strongly acid to moderately acid
Bjjg horizon:
Matrix color: hue of 7.5YR to 2.5Y; value of 3 to 5; chroma of 1 to 4
Redoximorphic concentrations: hue of 2.5YR to 7.5YR; value of 3 to 5; chroma of 4 or 6
Redoximorphic depletions: hue of 10YR to 5Y; value of 4 to 6; chroma of 1 or 2
Texture: silt loam or silt
cryoturbation and gelic materials: 5 to 30 percent hue of 7.5YR or 10YR; value of 2 or 2.5; chroma of 1 or 2
Reaction class: moderately acid to neutral
Bjjgf horizon:
COMPETING SERIES: This is the Chatinika series. Chatinika series have substantial mica content in the control section and inferred massive ground ice in the subsoil.
GEOGRAPHIC SETTING:
Parent material: loess and alluvium
Landform: alluvial fans
Slopes: 0 to 2 percent
Mean annual temperature: about 25 degrees F., -4 degrees C.
Mean annual precipitation: about 11 inches, 280 mm
GEOGRAPHICALLY ASSOCIATED SOILS: These include the
Nenana and Richarson. Nenana soils are on alluvial terraces and fans and are well drained.
Richardson soils are on alluvial terraces and fans and are moderately well drained
DRAINAGE AND PERMEABILITY: poorly drained, moderate runoff, saturated hydraulic conductivity rapid in the fibric soil material, moderate in the hemic material and coarse-silty mantle and impermeable in the permafrost.
USE AND VEGETATION: Used for recreation and wildlife habitat. The native vegetation includes stunted black spruce forest.
DISTRIBUTION AND EXTENT: MLRA 229, Interior Alaska lowlands, The series is of small extent.
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: WASILLA, ALASKA
SERIES ESTABLISHED: Greater Nenana Area, Alaska, 2007
REMARKS: Diagnostic features and horizons recognized in this profile include:
redoximorphic concentrations: from 7 to 72 inches, 18 to 183 cm.
redoximorphic depletions: from 7 to 72 inches, 18 to 183 cm.
cryoturbation and gelic materials: from 7 to 72 inches, 18 to 183 cm.
permafrost: from 24 to 72 inches, 62 to 183 cm.
Temperature regime: Cryic 26 F., -3 C.
Moisture regime: aquic
ADDITIONAL DATA: National Soil Survey Laboratory data S04AK-068-001
National Cooperative Soil Survey
U.S.A.