LOCATION SUNDAYCREEK AK
Established Series
SAS/ABD/MPR
02/2022
SUNDAYCREEK SERIES
Landscape--mountains
Landform--alluvial fans
Slope--5 to 20 percent
Parent material--volcanic ash over colluvium
Mean annual precipitation--about 1550 mm
Mean annual air temperature--about 0 degrees C
Depth class--very deep
Drainage class--somewhat excessively drained
Soil moisture regime--udic
Soil temperature regime--cryic
Soil moisture subclass--typic
TAXONOMIC CLASS: Sandy-skeletal, mixed Typic Humicryods
TYPICAL PEDON: Sundaycreek medial fine sandy loam on a north-facing, linear and convex rise of an alluvial fan on the lower third of a mountain, on a slope of 10 percent at an elevation of 93 m (The soil was moist throughout when described on August 31, 2012.)
Oa--0 to 4 cm; highly decomposed plant material; many very fine and fine and common medium roots; very strongly acid (pH 4.6); clear smooth boundary
E--4 to 9 cm; medial fine sandy loam, very pale brown (10YR 8/2) dry, light brownish gray (10YR 6/2) moist; weak medium granular structure; soft, very friable, nonsticky and nonplastic; many very fine and fine and common medium and coarse roots; very strongly acid (pH 4.5); abrupt irregular boundary
Bhs--9 to 25 cm; medial fine sandy loam, dark gray (7.5YR 4/1) dry, black (7.5YR 2.5/1) moist; moderate medium granular structure; slightly hard, friable, nonsticky and nonplastic; common very fine to medium roots; very strongly acid (pH 5.0); clear smooth boundary
2BC--25 to 55 cm; very gravelly sandy loam, pale yellow (2.5Y 7/4) dry, light olive brown (2.5Y 5/4) moist; weak medium subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; common very fine and fine roots; 45 percent gravel; strongly acid (pH 5.2); clear smooth boundary
2C--55 to 150 cm; extremely gravelly loamy coarse sand, grayish brown (2.5Y 5/2) dry, very dark grayish brown (2.5Y 3/2) moist; single grain; soft, very friable, nonsticky and nonplastic; common fine roots; 75 percent gravel; strongly acid (pH 5.4)
TYPE LOCATION: Dillingham Census Area, Alaska, about 85 km northeast of the village of Togiak; latitude 59.7053388 degrees north, longitude 159.5427355 degrees west, datum WGS 84 (coordinates determined with a GPS)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--0 to 3 degrees C
Soil moisture control section--dry less than 45 consecutive days in June through October (udic moisture regime)
Lithology of rock fragments--sedimentary, volcanic
Layers influenced by volcanic ash
*Thickness--12 to 24 cm
*Phosphorous retention--85 to 100 percent
*Bulk density--0.45 to 0.9 g/cm3
*Ammonium oxalate Al plus 1/2 Fe--2 to 4 percent
*Volcanic glass content--5 to 75 percent
Particle-size control section
*Clay content--0 to 12 percent
*Sand content--45 to 75 percent
*Total rock fragment content--35 to 80 percent
Oa horizon
Thickness--2 to 10 cm
E horizon
Hue--7.5YR, 10YR
Value--4 to 6 moist, 6 to 8 dry
Chroma--1 or 2 moist
Fine-earth texture--medial silt loam, medial fine sandy loam
Clay content--3 to 10 percent
Reaction--4.5 to 5.9
Thickness--2 to 14 cm
Organic carbon content--5 to 15 percent
Bulk density--0.4 to 0.8 g/cm3
Phosphorous retention--85 to 90 percent
Volcanic glass content--40 to 75 percent
Bhs horizon
Hue--5YR, 7.5YR
Value--2.5 or 3 moist, 4 or 5 dry
Chroma--1 to 3 moist
Clay content--3 to 10 percent
Reaction--4.5 to 5.9
Total rock fragment content--0 to 15 total
Gravel content--0 to 15 percent
Cobble content--0 to 5 percent
Thickness--10 to 22 cm
Organic carbon content--5 to 15 percent
Bulk density--0.6 to 0.9 g/cm3
Phosphorous retention--95 to 100 percent
Volcanic glass content--10 to 50 percent
2BC horizon
Hue--10YR, 2.5Y
Value--3 to 5 moist, 5 to 7 dry
Chroma--3 or 4 moist
Clay content--3 to 12 percent
Reaction--5.0 to 6.0
Total rock fragment content--35 to 65 percent
Gravel content--10 to 60 percent
Cobble content--0 to 10 percent
Stone content--0 to 10 percent
Thickness--10 to 53 cm
2C horizon
Hue--10YR, 2.5Y
Value--3 or 4 moist, 5 or 6 dry
Chroma--2 to 4 moist
Fine earth texture--coarse sand, loamy coarse sand
Clay content--0 to 8 percent
Reaction--5.0 to 6.0
Total rock fragment content--35 to 80 percent
Gravel content--35 to 80 percent
Cobble content--0 to 20 percent
Stone content--0 to 10 percent
Thickness--more than 60 cm
COMPETING SERIES:
Blashke--no andic soil properties
Baranof--no andic soil properties; aquic conditions
Krubate--no andic soil properties
Jakolof--mean annual soil temperature of 2.8 to 4.4 degrees C
GEOGRAPHIC SETTING:
Elevation--70 to 370 m
Climate--warm, moist summers; cold, moist winters
Mean annual precipitation--1300 to 2000 mm
Mean annual air temperature-- -1.8 to 0.9 degrees C
Frost-free period--75 to 130 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Nagugun--no albic horizon; glaciated plains
Awayak--no spodic horizon; no andic soil properties; frequent flooding; flood plains
Northspit--less than 50 cm (shallow) to lithic contact; mountain slopes
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--somewhat excessively drained
Saturated hydraulic conductivity (Ksat)--moderately high or high in the E and Bhs horizons, very high in the 2BC and 2C horizons
USE AND VEGETATION:
Use--wildlife habitat, recreation, subsistence
Potential natural vegetation--Sitka alder, Kenai birch, bluejoint, spreading woodfern, western oakfern, splendid feather moss, Schreber's big red stem moss, Greene's mountain ash, beauverd spirea
DISTRIBUTION AND EXTENT: Ahklun Mountains, Alaska; MLRA 237; small extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: WASILLA, ALASKA
SERIES ESTABLISHED: Togiak National Wildlife Refuge, Dillingham Census Area, Alaska; 2019
REMARKS:
Diagnostic horizons and other features in this pedon
*Particle-size control section--zone from 29 to 104 cm
*Ochric epipedon
*Albic horizon--E horizon
*Spodic horizon--Bhs horizon
*Andic soil properties--E and Bhs horizons
*Depth to lithologic discontinuity--top of 2BC horizon
See laboratory pedon number 13N0048 for properties of spodic horizon.
National Cooperative Soil Survey
U.S.A.