LOCATION BOHEMIA                 OR

Tentative Series
DCR/MPR
12/2024

BOHEMIA SERIES

Landscape--Cascade mountains
Landform--mountain slopes
Slope--0 to 90 percent
Parent material--colluvium derived from tuff
Mean annual precipitation--about 1350 mm
Mean annual air temperature--about 9 degrees C
Depth class--very deep
Drainage class--well drained
Soil moisture regime--udic
Soil temperature regime--mesic
Soil moisture subclass--typic

TAXONOMIC CLASS: Fine-loamy, isotic, mesic Typic Dystrudepts

TYPICAL PEDON: Bohemia gravelly loam, on a mountain slope with a slope of 75 percent and an elevation of 652 m (All textures are apparent field textures).

Oi--0 to 3 cm; slightly decomposed plant material; abrupt wavy boundary

A--3 to 15 cm; gravelly loam, light brownish gray (10YR 6/2) dry, dark grayish brown (10YR 4/2) moist; weak medium subangular blocky parts to moderate fine granular structure; slightly hard, very friable, slightly sticky, moderately plastic; many very fine and common fine and medium roots; many very fine interstitial and common very fine dendritic tubular pores; 18 percent gravel and 2 percent paragravel; moderately acid (pH 5.6); clear wavy boundary

AB--15 to 58 cm; loam, light gray (10YR 7/2) dry, dark grayish brown (10YR 4/2) moist; weak medium subangular blocky parts to moderate fine granular structure; slightly hard, very friable, slightly sticky, moderately plastic; common very fine and medium roots; many very fine interstitial and common very fine and fine dendritic tubular pores; 8 percent gravel and 2 percent paragravel; moderately acid (pH 5.8); clear smooth boundary

Bw1--58 to 110 cm; loam, light brownish gray (10YR 6/2) dry, dark grayish brown (10YR 4/2) moist; weak medium subangular blocky structure; moderately hard, very friable, moderately sticky, moderately plastic; common very fine and few medium roots; common very fine and few fine dendritic tubular pores; 8 percent gravel and 2 percent paragravel; moderately acid (pH 5.8); clear smooth boundary

Bw2--110 to 150 cm; gravelly loam, light gray (10YR 7/2) dry, dark grayish brown (10YR 4/2) moist; weak medium subangular blocky structure; moderately hard, friable, moderately sticky, moderately plastic; few very fine roots; common very fine dendritic tubular pores; 18 percent gravel, 5 percent paragravel, and 3 percent cobbles; moderately acid (pH 5.8)

TYPE LOCATION: Lane County, Oregon, about 2 km west of Hills Creek Reservoir in Willamette National Forest; 440 m south and 320 m east of the northwest corner of section 17, T. 23 S., R. 3 E., Willamette Meridian; latitude 43.58036, longitude -122.48550, datum WGS 84 (coordinates determined with a GPS)

RANGE IN CHARACTERISTICS:
Mean annual soil temperature--8 to 11 degrees C
Depth to restrictive feature--greater than 150 cm
Hue--10YR, 7.5YR

Particle-size control section (weighted average)
*Clay content--18 to 27 percent
*Total rock fragment content--less than 35 percent

Oi horizon
*Thickness--0 to 6 cm

A horizon
*Value--3 or 4 moist, 5 or 6 dry
*Chroma--2 to 4 moist and dry
*Clay content--18 to 25 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
*Reaction--pH 5.1 to 6.0
*Thickness--10 to 25 cm

AB horizon
*Value--3 or 4 moist, 6 or 7 dry
*Chroma--2 to 4 moist and dry
*Clay content--18 to 27 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
*Reaction--pH 5.1 to 6.0
*Thickness--25 to 50 cm

Bw horizons
*Value--3 to 5 moist, 6 or 7 dry
*Chroma--2 to 4 moist or dry
*Clay content--18 to 27 percent
*Total fragment content--5 to 35 percent
*Gravel content--5 to 35 percent
*Cobble content--0 to 15 percent
*Paragravel content--0 to 10 percent
*Reaction--pH 5.1 to 6.0

COMPETING SERIES:
Skinner--100 to 150 cm to lithic contact
Westfir--50 to 100 cm to paralithic contact

GEOGRAPHIC SETTING:
Elevation--240 to 910 m
Climate--warm, dry summers; mild, moist winters
Mean annual precipitation--1200 to 1500 mm
Mean annual air temperature--7 to 10 degrees C
Frost-free period--120 to 180 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Goldcreek--xeric soil moisture regime; argillic horizon; located on south-facing mountain slopes
Norling--50 to 100 cm to paralithic contact; xeric soil moisture regime; located on convex portions of south-facing mountain slopes
Westfir--50 to 100 cm to paralithic contact; located on 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)--high

USE AND VEGETATION:
Use--timber production, recreation, wildlife habitat
Potential natural vegetation--Douglas-fir, western hemlock, sugar pine, giant chinquapin, Cascade barberry, salal, western swordfern, and twinflower; commonly supports a western hemlock/dwarf Oregon grape-salal (CHS160) plant association (see Field Guide to the Forested Plant Associations of the Westside Central Cascades of Northwest Oregon)

DISTRIBUTION AND EXTENT: Southwestern Oregon Cascade Mountains, Oregon; MLRA 3; moderate extent

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana

SERIES PROPOSED: Willamette National Forest, Lane County, Oregon; 2022; name from Bohemia Mountain, located several miles west of the type location

REMARKS:
Diagnostic horizons and other features in this pedon
*Particle-size control section--zone from 28 to 103 cm
*Ochric epipedon
*Cambic horizon--58 to 150 cm

ADDITIONAL DATA: Type location user pedon ID--2020OR039796

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National Cooperative Soil Survey
U.S.A.