LOCATION DACKEY AK
Established Series
Rev. MHC/JPM/DLM
02/2022
DACKEY SERIES
Depth class: very deep
Drainage class: somewhat poorly drained
Parent material: stratified loamy alluvium and/or sandy and silty alluvium over gravelly alluvium
Landform: floodplains and low stream terraces
Slopes: 0 to 2 percent
Mean annual temperature: about 26 degrees F.
Mean annual precipitation: about 16 inches.
TAXONOMIC CLASS: Coarse-loamy over sandy or sandy-skeletal, mixed, superactive, nonacid Aquic Cryofluvents
TYPICAL PEDON: Dickey fine sandy loam - on a 0 percent slope under alder and willow shrub at 1950 feet (594 meters) elevation. (All colors are for moist soil)
AC/Oe--0 to 7 inches; very dark grayish brown (10YR 3/2) fine sandy loam; weak medium platy structure; very friable, nonsticky and nonplastic; common very fine, fine, and medium roots; slightly acid (pH 6.4); gradual smooth boundary. (4 to 9 inches thick)
C--7 to 18 inches; very dark grayish brown (10YR 3/2) stratified sand through silt with composite texture of sandy loam; weak medium subangular blocky structure; very friable, nonsticky and nonplastic; few common distinct dark yellowish brown (10YR 4/4) redox concentrations and dark grayish brown (2.5Y 4/2) redox depletions; common very fine, fine and medium roots; slightly acid (pH 6.4); clear smooth boundary. (6 to 14 inches thick)
Cg--18 to 27 inches; dark greenish gray (5GY 4/1) stratified sand through silt, composite texture of sandy loam; weak coarse subangular blocky structure; very friable, nonsticky and nonplastic; reduced matrix; common very fine, fine, and medium roots; neutral (pH 6.8); abrupt smooth boundary. (4 to 15 inches thick)
2C--27 to 60 inches; variegated extremely gravelly coarse sand; single grain; loose, nonsticky and nonplastic; 50 percent rounded gravel and 15 percent rounded cobble; neutral (pH 7.0).
TYPE LOCATION: Gulkana River Area, main stem, Alaska; about 5 miles northwest of Sourdough; the NW1/4 of the SW1/4 of section 4, T.9N., R.2W., Copper River Meridian.
RANGE IN CHARACTERISTICS:
Textures: stratas ranging from sand to silt overlying relatively clean sand and gravel
Upper part of particle size control section (weighted average): coarse loamy
Lower part of particle size control section: sandy-skeletal
Depths to sand and gravel: 10 to 40 inches
Depth to a reduced matrix or many redox features: 14 to 30 inches
Organic carbon content: presumed to vary irregularly with increasing depth
Organic mat: 0 to 2 inches thick
Soil reaction: slightly acid to neutral throughout the profile
Oe part of AC/Oe and Oi horizons:
Matrix color: value of 2 or 3; chroma of 1 or 2
Texture: slightly decomposed plant material, moderately decomposed plant material
AC part of AC/O, Ab, or ACb horizons:
Matrix color: hue of 10YR or 2.5Y; value of 2 to 4; chroma of 1 to 3
Texture: fine sandy loam, very fine sandy loam, fine sandy loam, silt loam, stratified sand to silt
C horizons:
Matrix color: hue of 10YR or 2.5Y; value of 3 or 4; chroma of 1 to 3; occasional pockets and strata of organic materials: hue of 7.5YR or 10YR; chroma of 1 or 2
Texture: is stratified sand through silt with composite texture of fine sandy loam or sandy loam; occasional pockets and strata of organic materials occur and have texture of slightly decomposed plant material or moderately decomposed plant material
Redox concentrations (where present): hue of 5YR to 10YR; value of 3 or 4; chroma of 4 to 6
Redox depletions (where present): hue of 2.5Y or 5Y; chroma of 1 or 2.
Cg horizon:
Matrix color: hue of 10YR to 5GY; value of 3 to 5; chroma of 1 or 2
Texture: stratified sand through silt with composite texture of fine sandy loam or sandy loam
Redoximorphic features (where present): common or many redox concentrations and redox depletions
Redox concentrations (where present): hue of 5YR to 10YR; value of 3 or 4; chroma of 4 to 6
Redox depletions: hue of 2.5Y or 5Y; chroma moist of 1 or 2
2C horizons:
Matrix color: variegated
Texture: sand or coarse sand modified by 35 to 70 percent total coarse fragments, 20 to 60 percent rounded gravel, 5 to 30 percent rounded cobble
COMPETING SERIES: There are no competing series in this family or subgroup.
GEOGRAPHIC SETTING:
Parent material: stratified loamy alluvium and/or sandy and silty alluvium over gravelly alluvium
Landform: floodplains and low stream terraces
Slopes: 0 to 2 percent
Mean annual temperature: about 26 degrees F.
Mean annual precipitation: about 16 inches.
Elevation ranges from 1850 to 2475 feet.
GEOGRAPHICALLY ASSOCIATED SOILS:
DRAINAGE AND PERMEABILITY: Somewhat poorly drained, negligible or low runoff. Saturated hydraulic conductivity is moderately high to high in the upper horizons and high to very high in the gravelly underlying material. Dackey soils are subject to flooding.
USE AND VEGETATION: Mostly young balsam poplar forest and willow and alder shrub. Primary uses of these soils include recreation and wildlife habitat.
DISTRIBUTION AND EXTENT: MLRA 228 Interior Alaska Mountains, Alaska. The soil is moderately extensive.
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: WASILLA, ALASKA
SERIES ESTABLISHED: Gulkana River Area, Alaska. 1999
REMARKS: Diagnostic features recognized in this profile include: no diagnostic Reduced matrix: 18 inches
Presumed irregular decrease in organic carbon: based on colors, stratification, and occasional flooding
Temperature regime: cryic
Coarse loamy particle size (weighted average): 0 to 27 inches and sandy skeletal particle size from 27 to 60 inches.
National Cooperative Soil Survey
U.S.A.