LOCATION SINGE OR
Tentative Series
IRD. DCR/MPR
02/2025
SINGE SERIES
Landscape--southwestern Middle Cascade mountains
Landform--mountain slopes, complex landslides
Slope--0 to 90 percent
Parent material--colluvium derived from tuff
Mean annual precipitation--about 1300 mm
Mean annual air temperature--about 9 degrees C
Depth class--very deep
Drainage class--well drained
Soil moisture regime--xeric
Soil temperature regime--mesic
Soil moisture subclass--typic
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Typic Dystroxerepts
TYPICAL PEDON: Singe gravelly loam, on a south-facing mountain slope with a slope of 55 percent and an elevation of 622 m
Oi--0 to 4 cm; slightly decomposed plant material, abrupt wavy boundary
A--4 to 15 cm; gravelly loam, pale brown (10YR 6/3) dry, dark brown (10YR 3/3) moist; moderate medium subangular blocky structure parts to strong fine granular structure; slightly hard, very friable, slightly sticky, moderately plastic; many very fine and common fine and medium roots; many very fine dendritic tubular and common medium tubular pores; 20 percent gravel, 8 percent paragravel, and 2 percent cobbles; moderately acid (pH 5.8); clear wavy boundary
AB--15 to 38 cm; gravelly loam, light brownish gray (10YR 6/2) dry, brown (10YR 4/3) moist; moderate medium subangular blocky structure; moderately hard, friable, moderately sticky, moderately plastic; common very fine and few fine and common medium roots; many very fine dendritic tubular and common medium tubular pores 15 percent gravel and 8 percent paragravel; moderately acid (pH 5.8); gradual smooth boundary
Bw1--38 to 70 cm; loam, pale brown (10YR 6/3) dry, brown (10YR 4/3) moist; moderate medium subangular blocky structure; hard, friable, moderately sticky, moderately plastic; many very fine and common medium and very coarse roots; many very fine dendritic tubular and common fine dendritic tubular pores; 5 percent gravel and 5 percent paragravel; moderately acid (pH 5.6); clear smooth boundary
Bw2--70 to 105 cm; clay loam, pale brown (10YR 6/3) dry, brown (10YR 4/3) moist; weak medium subangular blocky structure; very hard, friable, moderately sticky, moderately plastic; few very fine roots; many very fine and few fine dendritic tubular pores; 2 percent gravel, 3 percent paragravel, and 5 percent cobbles; strongly acid (pH 5.4); clear smooth boundary
Bw3--105 to 150 cm; cobbly clay loam, pale brown (10YR 6/3) dry, brown (10YR 4/3) moist; weak medium subangular blocky structure; very hard, friable, moderately sticky, moderately plastic; few very fine roots; 6 percent gravel, 7 percent paragravel, and 12 percent cobbles; strongly acid (pH 5.2)
TYPE LOCATION: Lane County, Oregon, about 2 km west of Hills Creek Reservoir in Willamette National Forest; 50 m south and 450 m east of the northwest corner of section 17, T. 23 S., R. 3 E., Willamette Meridian; latitude 43.58384, longitude -122.48390, datum WGS 84 (coordinates determined with a GPS)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--8 to 12 degrees C
Moisture control section--dry 45 to 60 consecutive days following summer solstice
Depth to bedrock--greater than 150 cm
Base saturation (ammonium acetate) in the zone 25 to 75 cm below the mineral soil surface--25 to 60 percent
Hue--10YR or 7.5YR
Reaction--pH 5.1 to 6.0
Oi horizon
*Combined thickness--1 to 5 cm
A horizon
*Value--3 or 4 moist, 5 or 6 dry
*Chroma--2 or 3 moist and dry
*Clay content--15 to 25 percent
*Sand content--30 to 50 percent
*Total fragment content--15 to 50 percent
*Gravel content--15 to 50 percent
*Cobble content--0 to 5 percent
*Paragravel content--0 to 10 percent
*Thickness--10 to 25 cm
AB horizon
*Value--3 or 4 moist
*Chroma--2 to 4 moist and dry
*Clay content--18 to 27 percent
*Sand content--30 to 50 percent
*Total fragment content--5 to 35 percent
*Gravel content--5 to 35 percent
*Cobble content--0 to 5 percent
*Paragravel content--0 to 10 percent
*Combined thickness--10 to 25 cm
Bw horizons
*Value--3 to 5 moist, 5 or 6 dry
*Chroma--3 or 4 moist or dry
*Fine-earth texture--clay loam, loam
*Clay content--18 to 35 percent
*Sand content--20 to 40 percent
*Total fragment content--5 to 35 percent
*Gravel content--0 to 35 percent
*Cobble content--0 to 15 percent
*Paragravel content--0 to 10 percent
COMPETING SERIES:
Colestine--depth to lithic contact is 50 to 100 cm
Eagreek--hue is redder than 7.5YR in cambic horizon
Holkat-- depth to paralithic contact is 50 to 100 cm
Hurlbut-- depth to paralithic contact is 50 to 100 cm
Littlesand--depth to paralithic contact is 50 to 100 cm
Hugo--depth to paralithic contact is greater than 100 cm; dry in all parts of the moisture control section for greater than 90 consecutive days following summer solstice
Tannin--frost free period is 240 to 280 days; mean annual soil temperature is 10 to 15 degrees C
GEOGRAPHIC SETTING:
Elevation--250 to 1050 m
Climate--hot, dry summers; mild, moist winters
Mean annual precipitation--1100 to 1500 mm
Mean annual air temperature--7 to 11 degrees C
Frost-free period--120 to 180 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Bohemia--udic soil moisture regime; located on north-facing mountain slopes
Vena--50 to 100 cm to lithic contact; located on convex portions of south-facing mountain slopes
Zing--aquic conditions within 75 cm of the mineral soil surface, greater than 35 percent clay in an argillic horizon; located on complex landslides
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--moderately high
USE AND VEGETATION:
Use--timber production, recreation, wildlife habitat
Potential natural vegetation--Douglas-fir, incense cedar, sugar pine, Pacific madrone, Cascade barberry, salal, common whipplea, western swordfern, and American trailplant; commonly supports a Douglas-fir/dwarf Oregon grape-salal (CDS512) plant association (see Field Guide to the Forested Plant Associations of the Westside Central Cascades of Northwest Oregon)
DISTRIBUTION AND EXTENT: Southwestern Oregon Cascades, Oregon; MLRA 3; moderate extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana
SERIES PROPOSED: Willamette National Forest, Lane County, Oregon; 2022; name from creek on Umpqua National Forest
REMARKS:
Diagnostic horizons and other features in this pedon
*Particle-size control section--zone from 29 to 104 cm
*Ochric epipedon
*Cambic horizon--zone from 38 to 150 cm
12/2023--Tannin series competes closely: frost free period is the only clearly separate characteristic. Singe soils appear to have clay films on ped faces which disappear when the soil dries.
ADDITIONAL DATA:
*Typical pedon ID--2020OR039830
National Cooperative Soil Survey
U.S.A.