LOCATION MUKLUNG AK
Established Series
SAS/TJR/SJN
05/2022
MUKLUNG SERIES
The Muklung series consists of very deep, moderately well drained soils formed in volcanic ash over loess on rises and talfs of plains. Slopes range from 0 to 16 percent. The mean annual precipitation is about 635 millimeters and the mean annual air temperature is about 0.6 degree C.
TAXONOMIC CLASS: Medial over loamy, amorphic over isotic Andic Haplocryods
TYPICAL PEDON: Muklung highly organic silt loam, located on a plain rise with a slope of 15 percent and elevation of 19 meters; when described on September 15th, 2007 the soil was moist to 157 and saturated from 157 to 183 cm (Colors are for moist soil unless otherwise noted)
Oe--0 to 2 cm; moderately decomposed plant material; nonsticky, nonplastic; common fine roots, common medium roots, and common coarse roots; very strongly acid (pH 4.7); clear smooth boundary
E--2 to 6 cm; brown (7.5YR 4/2) highly organic silt loam; 20 percent sand; 72 percent silt; 8 percent clay; weak medium granular structure; friable, nonsticky, nonplastic; common fine roots and common medium roots; very strongly acid (pH 4.7); clear smooth boundary
Bhs--6 to 10 cm; very dark brown (7.5YR 2.5/2) medial highly organic silt loam; 20 percent sand; 72 percent silt; 8 percent clay; weak medium subangular blocky structure; friable, nonsticky, nonplastic; common fine roots and common medium roots; very strongly acid (pH 5.0); clear smooth boundary
BC1--10 to 85 cm; dark olive brown (2.5Y 3/3) medial silt; 12 percent sand; 82 percent silt; 6 percent clay; weak coarse subangular blocky structure; friable, nonsticky, nonplastic; common fine roots and common medium roots; moderately acid (pH 5.6); gradual smooth boundary
BC2--85 to 95 cm; 50 percent brown (10YR 4/3) silt loam; 18 percent sand; 76 percent silt; 6 percent clay; weak medium subangular blocky structure; friable, nonsticky, nonplastic; 20 percent medium dark grayish brown (2.5Y 4/2) masses of reduced iron with clear boundaries and 30 percent medium strong brown (7.5YR 4/6) masses of oxidized iron with sharp boundaries; moderately acid (pH 5.7)
Cg--95 to 183 cm; 80 percent gray (5Y 5/1) silt loam; massive; friable, nonsticky, nonplastic; 20 percent coarse strong brown (7.5YR 4/6) masses of oxidized iron with sharp boundaries; moderately acid (pH 6.0)
TYPE LOCATION: Dillingham Census Area, Alaska; 4 kilometers northwest of Dillingham; 59.0547222 degrees north latitude and 158.5247222 degrees west longitude.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature - 0.6 to 1.8 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 albic horizon - 3 to 6 cm
Thickness of spodic horizon - 4 to 7 cm
Thickness of andic soil properties - 34 to 79 cm
Depth to aquic conditions - 90 to 115 cm
All mineral horizons-
Reaction - 4.2 to 6.1
Volcanic glass content - trace amounts to 21 percent
Ammonium oxalate extractable Al + 1/2 Fe - 0.54 to 3.57
Moist bulk density - 0.60 to 1.75 g/cc
Particle-size control section-
Clay content - 3 to 7 percent
Rock fragments - 0 to 15 percent
Oe horizon
Thickness - 2 to 9 cm
E horizon
Hue - 7.5YR or 10YR
Value - 4
Chroma - 2
Fine earth texture - Highly organic silt loam or highly organic silt
Clay content - 5 to 10 percent
Reaction - 4.2 to 4.7
Rock fragments - 0 percent
Thickness - 3 to 6 cm
Bhs horizon
Hue - 5YR or 7.5YR
Value - 2.5 or 3
Chroma - 2 or 3
Fine earth texture - Medial highly organic silt loam or medial highly organic silt
Clay content - 5 to 8 percent
Reaction - 4.8 to 5.0
Rock fragments - 0 percent
Thickness - 4 to 7 cm
BC1 horizon
Hue - 7.5YR to 2.5Y
Value - 3 or 4
Chroma - 2 or 3
Fine earth texture - Medial silt or medial silt loam
Clay content - 3 to 7 percent
Reaction - 5.5 to 5.8
Rock fragments - 0 percent
Thickness - 19 to 75 cm
BC2 horizon
Hue - 7.5YR to 2.5Y
Value - 4
Chroma - 2 to 4
Fine earth texture -silt loam
Clay content - 3 to 7 percent
Reaction - 5.7 to 5.9
Rock fragments - 0 percent
Thickness - 10 to 73 cm
Cg or C horizon
Hue - 10YR to 5Y
Value - 4 or 5
Chroma - 1 to 3
Fine earth texture -silt loam
Clay content - 3 to 7 percent
Reaction - 6.0 to 6.1
Rock fragments - 0 to 15 percent subrounded gravels
Thickness - 68 to 93 cm
COMPETING SERIES: There are no competing series
GEOGRAPHIC SETTING:
Parent material - Organic material over coarse-silty volcanic ash over coarse-silty loess
Landform - Rises and talfs on plains
Slope - 0 to 16 percent
Elevation - 1 to 107 meters
Climate - Short, cool summers; long, cold winters
Mean annual precipitation - 609 to 777 mm
Mean annual air temperature - 0.4 to 0.7 degrees C
Frost free duration - 85 to 140 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Kanakanak - Very deep to aquic conditions, similar landform position
Nushagak - Aquic conditions at surface, plain talfs
Pellernarquq - Aquic conditions at surface, dips and talfs on plains
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: (Ksat)
Drainage class - Moderately well drained
Saturation in normal years - Below 85 cm for all months, except for saturation up to depth of 42 cm for less than two weeks in June
Flooding - None
Ponding - Occasional and brief
Ksat - Moderately low to high in the E, Bhs, and BC1 horizons; moderately high in the BC2 and Cg horizons
USE AND VEGETATION:
Use - Community development, wildlife habitat, recreation, and forestry resources
Potential natural vegetation - Boreal forest composed of white spruce, paper birch, spirea, bluejoint grass, spreading woodfern, and feathermoss
DISTRIBUTION AND EXTENT: Bristol Bay Lowlands; MLRA 236; small extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: WASILLA, ALASKA
SERIES ESTABLISHED: Nushagak-Mulchatna Watershed Soil Survey, Dillingham Census Area, Alaska, 2019
REMARKS:
Particle-size control section - 27 to 102 cm
Ochric epipedon
Soil moisture regime - Udic
Andic soil properties - Bhs and BC1 horizons
Spodic Horizon - Bhs horizons
Aquic conditions - BC2 and Cg horizons
National Cooperative Soil Survey
U.S.A.