LOCATION BLUEBUCKET OR
Tentative Series
DMK/TDT
12/2024
BLUEBUCKET SERIES
Landscape--mountains, foothills
Landform--mountain flanks, hillslopes, canyon walls
Slope--15 to 65 percent
Parent Material--thick mantle of volcanic ash over mixed colluvium and residuum derived from marine sediments
Mean annual precipitation--about 460 mm
Mean annual air temperature--about 7 degrees C
Depth class--deep and very deep
Drainage class--well drained
Soil moisture regime--xeric
Soil temperature regime--frigid
Soil moisture subclass--typic
TAXONOMIC CLASS: Ashy over loamy, glassy over isotic, frigid Alfic Humic Vitrixerands
TYPICAL PEDON: Bluebucket ashy sandy loam -- upland forest, on a 37 percent concave slope, north aspect, at an elevation of 1530 meters. (Colors are for dry soil unless otherwise noted.)
Oi--0 to 3 centimeters; slightly decomposed pine litter
A1--3 to 13 centimeters; very dark gray (10YR 3/1) ashy fine sandy loam, very dark brown (10YR 2/2) moist; weak very fine and fine granular structure; loose, very friable, slightly sticky and non--plastic; many very fine and fine roots; many very fine interstital pores; 10 percent gravel, slightly acid (pH 6.4); clear wavey boundary
A2--13 to 41 centimeters; very dark grayish brown (10YR 3/2) ashy fine sandy loam, black (10YR 2/1) moist; weak medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly--plastic; common very fine, fine, medium, and coarse roots; common very fine and fine dendritic tubular pores; 10 percent gravel, slightly acid (pH 6.4); clear wavey boundary. (combined thickness of A horizons: 36 to 60 centimeters thick)
2Bt1--41 to 86 centimeters; brown (10YR 5/3) gravelly sandy clay loam, dark brown (10YR 3/3) moist; moderate very fine and fine subangular blocky stucture; slightly hard, friable, moderately sticky and moderately plastic; common very fine, medium and coarse roots; common fine and medium dendritic tubular pores; common faint discontinous clay films on all faces of peds; 15 percent gravel; slightly acid (pH 6.2); clear wavey boundary
2Bt2--86 to 152 centimeters; brownish yellow (10YR 6/6) gravelly sandy clay loam; yellowish brown (10YR 5/4) moist; moderate very fine and fine subangular blocky structure, moderately hard, firm, moderately sticky, and moderately plastic; few medium roots; few fine and medium dendtitic tubular pores; common faint discontinous clay films on all faces of peds; 30 percent gravel; slightly acid (pH 6.2)
R--152 centimeters; shale
TYPE LOCATION: Grant County, Oregon. Located about 200 meters north and 25 meters west of the southwest corner of Section 10, T.18 S, R. 26 E.; Latitude 44.0329170, Longitude --119.6176682, WGS84 Datum (coordinates determined with a GPS)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--5 to 7 degrees C
Soil moisture--dry 60 to 90 consecutive days in summer and early fall
Depth to lithic contact--greater than 100 centimeters
Thickness of mollic epipedon--50 to 100 centimeters
Thickness of argillic horizon--40 to 120 centimeters
Thickness of surface ash influenced layers--36 to 50 centimeters
Estimated properties of layers influenced by volcanic ash
*Al+1/2Fe (ammonium oxalate)--0.4 to 0.8 percent
*P retention--25 to 50 percent
*Volcanic glass content in the 0.02 to 2.0 mm fraction--30 to 50 percent
*Water content at 1500 kPa tension (air dried)--7 to 12 percent
Particle--size control section (upper part, ashy)
*Clay content (weighted average)--7 to 18 percent
*Total fragment content (weighted average)--5 to 15 percent
Particle--size control section (lower part, loam)
*Clay content (weighted average)--18 to 35 percent
*Total fragment content (weighted average)--15 to 35 percent
A horizons
*Hue--10YR
*Value--2 or 3 dry, 3 to 5 moist
*Chroma--1 to 4 dry, 1 or 2 moist
*Fine earth texture--ashy fine sandy loam, ash sandy loam
*Clay content--10 to 20 percent
*Sand content--55 to 75 percent
*Organic matter content--2 to 6 percent
*Total fragments--5 to 25 percent
*Gravel content--5 to 15 percent
*Cobble content--0 to 10 percent
*Reaction--slightly acid; pH 6.1 to 6.6
2Bt horizons
*Hue--10YR
*Value--3 to 6 dry, 2 to 5 moist
*Chroma--1 to 4 moist or dry
*Fine earth texture--sandy clay loam, clay loam
*Clay content--20 to 35 percent
*Sand content--35 to 70 percent
*Organic matter content--0.5 to 2 percent
*Total fragments--10 to 35 percent
*Gravel--10 to 35 percent
*Cobbles--0 to 30 percent
*Stones--0 to 2 percent
*Reaction--slightly acid to neutral; pH 6.1 to 7.3
COMPETING SERIES:
Valpey--greater than 150 cm to restrictive feature; coarse fragments composed of basalt, andesite or tuff
GEOGRAPHIC SETTING:
Elevation--1150 to 1830 meters
Climate--cool, wet winters and warm, dry summers
Mean annual precipitation--460 to 560 mm
Mean annual air temperature--5 to 7 degrees C
Frost--free period--50 to 90 days
Lithology--mesozoic sediments composed of marine shale, sandstone, limestone, argillite, or conglomerate
GEOGRAPHICALLY ASSOCIATED SOILS:
Arenased--occur on north facing mountain slopes; average less than 35 percent coarse fragments in the control section; 50 to 100 centimeters to paralithic contact
Keerins--occurs on adjacent hillslopes; less than 50 centimeters to lithic contact; averages greater than 35 percent coarse fragments in the control section; lacks organic surface horizon
Logdell--occurs on adjacent mountain slopes and hillslopes; less than 25 centimeters to lithic contact
Utley--occurs on toeslopes and drainageways; greater than 100 centimeters to lithic contact
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Saturation during normal years--none
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--high throughout
USE AND VEGETATION:
Use--timber production, wildlife habitat, livestock grazing
Potential native vegetation--ponderosa pine, mountain mahogany, pinegrass, Idaho fescue, bluebunch wheatgrass
DISTRIBUTION AND EXTENT:
Distribution--Blue and Ochoco Mountains of central Oregon
Extent--MLRA43C; small extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana
SERIES PROPOSED: Grant County, Oregon, 2008
REMARKS:
Diagnostic horizons and features recognized in this pedon are:
*Andic soil properties--3 to 41 cm
*Mollic epipedon--3 to 86 cm
*Argillic horizon--41 to 137 cm
The Plant association at the type location is: CPS 234 Dry Pine. (Johnson and Clausnitzer, 1992, Plant Associations of the Blue and Ochoco Mountains)
________________________________________
National Cooperative Soil Survey
U.S.A.