LOCATION HUNSAKER OR
Established Series
IRD. JLW/RJO/DAL/KMS
01/2019
HUNSAKER SERIES
Landscape--mountains, plateaus
Landform--mountain slopes, plateaus
Slope--0 to 90 percent
Parent material--thin mantle of volcanic ash over colluvium derived from basalt
Mean annual precipitation--about 900 mm
Mean annual air temperature--about 6 degrees C
Depth class--very deep
Drainage class--well drained
Soil moisture regime--udic
Soil temperature regime--frigid
Soil moisture subclass--typic
TAXONOMIC CLASS: Fine-loamy, isotic, frigid Andic Hapludalfs
TYPICAL PEDON: Hunsaker ashy silt loam, forested, on a 45-percent, north-facing slope at an elevation of 1280 m
Oi--0 to 3 cm; leaves and needles
A--3 to 8 cm; ashy silt loam, brown (7.5YR 5/4) dry, brown (7.5YR 4/4) moist; weak medium subangular blocky structure parting to weak fine and very fine subangular blocky; soft, very friable, slightly sticky and nonplastic; common very fine and fine and few medium roots; common fine irregular pores; neutral (pH 7.0); clear wavy boundary
Bw--8 to 36 cm; ashy silt loam, brown (7.5YR 5/4) dry, brown (7.5YR 4/4) moist; weak fine and very fine subangular blocky structure; soft, very friable, slightly sticky and nonplastic; common very fine, fine, and medium and few coarse roots; few fine tubular pores; slightly acid (pH 6.5); clear wavy boundary
2AEb--36 to 58 cm; silt loam, brown (7.5YR 4/4) dry, dark brown (7.5YR 3/4) moist; weak fine and very fine subangular blocky structure; slightly hard, friable, moderately sticky and slightly plastic; common fine and medium and few coarse roots; common fine and few medium tubular pores; neutral (pH 7.0); gradual smooth boundary
2Btb1--58 to 112 cm; silt loam, brown (7.5YR 5/4) dry, brown (7.5YR 4/4) moist; moderate medium and fine subangular blocky structure; hard, friable, moderately sticky and moderately plastic; few faint clay films on ped faces; common fine and medium and few coarse roots; common fine and few medium tubular pores and few fine irregular pores; slightly acid (pH 6.5); gradual smooth boundary
2Btb2--112 to 155 cm; gravelly clay loam, strong brown (7.5YR 5/6) dry, brown (7.5YR 4/4) moist; moderate medium and fine subangular blocky structure; hard, firm, moderately sticky and moderately plastic; common faint clay films on ped faces; common fine and few medium roots; few fine and medium tubular pores and few fine irregular pores; 15 percent gravel; slightly acid (pH 6.5)
TYPE LOCATION: Baker County, Oregon, about 5 m east and 82 m north of the southwest corner of section 24, T. 7 S., R. 44 E.; Sparta Butte U.S. Geological Survey quadrangle; latitude 44.9395534, longitude -117.2821456, datum WGS 84 (coordinates and PLSS details estimated from a point on a hard copy map)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--5 to 7 degrees C
Mean summer soil temperature--9 to 12 degrees C
Mean winter soil temperature--1 to 3 degrees C
Soil moisture--dry 30 to 45 consecutive days in summer
Thickness of ash-influenced layers--25 to 35 cm
Estimated properties of layers influenced by volcanic ash
*Ammonium oxalate extractable Al + 1/2 Fe--1.5 to 3.0 percent
*0.02- to 2.0-mm fraction--40 to 60 percent
*Glass content in 0.02- to 2.0-mm fraction--60 to 90 percent
*1/3-bar bulk density--0.65 to 1.00 g/cm3
*Phosphate retention--65 to 90 percent
Particle-size control section
*Clay content--20 to 27 percent
*Total rock fragment content--0 to 25 percent
A horizon, and AB horizon (where present)
Moist color--7.5YR 3/2, 7.5YR 3/4, 7.5YR 4/4
Dry color--7.5YR 4/3, 7.5YR 4/4, 7.5YR 5/4
Fine-earth texture--ashy silt loam
Clay content--10 to 17 percent
Sand content--20 to 25 percent
Organic matter content--2 to 6 percent
Total rock fragment content--0 to 5 percent
Gravel content--0 to 5 percent
Reaction--6.1 to 7.3
Thickness--5 to 20 cm
Bw horizon
Moist color--7.5YR 3/4, 7.5YR 4/4
Dry color--7.5YR 4/3, 7.5YR 4/4, 7.5YR 5/4
Fine-earth texture--ashy silt loam
Clay content--5 to 17 percent
Sand content--20 to 25 percent
Organic matter content--1 to 3 percent
Total rock fragment content--0 to 5 percent
Gravel content--0 to 5 percent
Cobble content--0 to 5 percent
Reaction--6.1 to 7.3
Thickness--20 to 30 cm
2AEb horizon, and 2Eb horizon (where present)
Moist color--7.5YR 3/4, 7.5YR 4/4
Dry color--7.5YR 4/4, 7.5YR 4/6, 7.5YR 5/4, 7.5YR 5/6
Fine-earth texture--loam, silt loam
Clay content--15 to 20 percent
Sand content--20 to 35 percent
Organic matter content--1.0 to 3.5 percent
Total rock fragment content--0 to 15 percent
Gravel content--0 to 15 percent
Cobble content--0 to 5 percent
Reaction--6.1 to 7.3
Thickness--20 to 45 cm
2Btb horizon
Moist color--7.5YR 3/4, 7.5YR 4/4
Dry color--7.5YR 4/4, 7.5YR 4/6, 7.5YR 5/4, 7.5YR 5/6
Fine-earth texture--silt loam, clay loam, silty clay loam
Clay content--20 to 35 percent
Sand content--15 to 30 percent
Organic matter content--0.5 to 3.5 percent
Total rock fragment content--0 to 35 percent
Gravel content--0 to 15 percent
Cobble content--0 to 15 percent
Stone content--0 to 5 percent
Reaction--6.1 to 7.3
COMPETING SERIES:
Floodwood--very deep (material derived from anorthosite, schist, and gneiss); volcanic ash mantle 25 to 35 cm thick and 5 to 65 percent volcanic glass; dry 10 to 20 consecutive days in summer
Lakestarr--deep to densic contact (till); fragic feature above densic contact
GEOGRAPHIC SETTING:
Elevation--1090 to 1640 m
Climate--cold, wet winters; cool, moist summers
Mean annual precipitation--670 to 1120 mm
Mean annual air temperature--4 to 6 degrees C
Frost-free period--50 to 80 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Kamela--on ridge crests and shoulder slopes; moderately deep (50 to 100 cm) to lithic contact (basalt); mixed mantle of ash and loess over loamy-skeletal colluvium; under grand fir,
Douglas-fir,
Rocky Mountain maple, ninebark, heartleaf arnica, and prince's pine
Klicker--on south-facing backslopes; moderately deep (50 to 100 cm) to lithic contact (basalt); mollic epipedon, minor ash influence; under
Douglas-fir or ponderosa pine forest
Melhorn--on south-facing backslopes and footslopes; very deep (more than 150 cm); mixed ash mantle; under
Douglas-fir, ponderosa pine, or grand fir forest
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Saturation during normal years--none
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--moderately high
USE AND VEGETATION:
Use--timber production, watershed, wildlife habitat, livestock grazing, recreation
Native vegetation--grand fir, subalpine fir, western larch, Douglas-fir, big huckleberry, heartleaf arnica, pinegrass, Piper's anemone, elk sedge, white hawkweed, myrtle pachystima, baldhip rose
Plant association--dominantly ABGR/VAME (grand fir/big huckleberry); may include ABGR/LIBOL (grand fir/longtube twinflower)
DISTRIBUTION AND EXTENT: Blue Mountains in northeastern Oregon; MLRA 43C; small extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Wallowa-Whitman National Forest, Oregon; 2018
REMARKS:
Diagnostic horizons and other features recognized in this pedon
*Ochric epipedon
*Cambic horizon--zone from 8 to 36 cm
*Buried eluvial horizon--zone from 36 to 58 cm
*Buried argillic horizon--zone from 58 to 155 cm
*Volcanic glass--zone from 3 to 36 cm
*Andic soil properties--zone from 3 to 36 cm
*Particle-size control section--zone from 58 to 109 cm
National Cooperative Soil Survey
U.S.A.