LOCATION SHORTNAP ORTentative Series
TAXONOMIC CLASS: Ashy over loamy, glassy over isotic Aquic Duricryands
TYPICAL PEDON: Shortnap ashy loamy sand - lodgepole pine/kinnikinnick pumice plant association, woodland, on a 1 percent slope at 5121 feet elevation. (Colors are for moist soil unless otherwise noted.)
Oi--0 to 0.3 inch; slightly decomposed plant material; forest litter of needles, twigs, cones and herbaceous material; abrupt smooth boundary. (0 to 2 inches thick)
Oe--0.3 to 0.6 inch; moderately decomposed plant material; forest litter of needles, twigs, cones and herbaceous material; abrupt smooth boundary. (0 to 2 inches thick)
Oa--0.6 to 1 inch; highly decomposed plant material; forest litter of needles, twigs, cones and herbaceous material; abrupt smooth boundary. (0 to 2 inches thick)
A--1 to 7 inches; dark grayish brown (10YR 4/2) ashy loamy sand, brown (10YR 5/3) dry; weak coarse subangular blocky structure parting to moderate fine granular; soft, very friable, nonsticky, nonplastic; many very fine, common fine and medium, and few coarse roots; many very fine, common fine and few medium irregular pores; 5 percent moderately cemented pumice paragravel; slightly acid (pH 6.4); clear wavy boundary. (2 to 14 inches thick)
AB--7 to 21 inches; dark grayish brown (2.5Y 4/2) ashy loamy coarse sand, pale brown (10YR 6/3) dry; weak medium subangular blocky structure; soft, very friable, nonsticky, nonplastic; common very fine and few fine, medium and coarse roots; many very fine and common fine irregular pores; 1 percent fine irregular black (2.5Y 2.5/1) manganese masses throughout, very dark gray (2.5Y 3/1) dry; 5 percent moderately cemented pumice paragravel; slightly acid (pH 6.5); abrupt smooth boundary. (6 to 30 inches thick)
2Bwc--21 to 35 inches; dark grayish brown (2.5Y 4/2) gravelly ashy loam, light brownish gray (10YR 6/2) dry; moderate medium subangular blocky structure; hard, friable, moderately sticky, moderately plastic; few very fine and fine roots; common very fine and few fine tubular pores; 3 percent fine irregular black (10YR 2/1) manganese masses on faces of peds, very dark gray (10YR 3/1) dry; 5 percent medium cylindrical dark yellowish brown (10YR 4/4) iron-manganese masses infused into matrix adjacent to pores, strong brown (7.5YR 5/6) dry; 10 percent indurated volcanic rock gravel and 8 percent strongly cemented iron-manganese nodule gravel; slightly acid (pH 6.2); volume of manganese masses, iron-manganese masses and iron-manganese nodules increases with depth; abrupt wavy boundary. (6 to 16 inches thick)
2Bqm--35 to 39 inches; brown (7.5YR 4/3) cemented material, light brownish gray (10YR 6/2) dry; strong thick platy structure; rigid, very strongly cemented by silica, nonsticky, nonplastic; 25 percent medium irregular very strongly cemented black (2.5Y 2.5/1) manganese nodules throughout, very dark gray (2.5Y 3/1) dry; 50 percent fine platy very strongly cemented brown (7.5YR 4/4) opal with sharp boundaries on faces of peds, reddish yellow (7.5YR 7/6) dry, neutral (pH 6.8)..
TYPE LOCATION: Klamath County, Oregon; about 10 miles north and 31 miles east of Chiloquin; 450 feet east and 100 feet north of the southwest corner of section 6, T. 33 S., R. 13 E., Riverbed Butte Spring, USGS quadrangle Oregon. UTM: 0644950 meters E; 4732430 meters N; Zone 10 N. NAD27 CONUS datum. Latitude: 42 degrees 43 minutes 57.00 seconds north, Longitude: 121 degrees 13 minutes 46.00 seconds west.
RANGE IN CHARACTERISTICS:
Soil Temperature: cryic regime
Mean annual soil temperature - 35 to 39 degrees F
Mean summer soil temperature - 38 to 41 degrees F
Mean winter soil temperature - 33 to 36 degrees F
Soil Moisture: udic regime maintained by episaturation; moisture control section - 12 to 36 inches, saturated in all parts for 15 to 30 days in May or June, saturated in the lower part for 120 to 150 days in April to August; moist when not saturated
Particle-size control section: from mineral soil surface to top of the duripan
Upper part (ashy): 20 to 33 inches thick
Ammonium oxalate extractable Al plus 1/2 Fe: 0.4 to 1.0 percent
Phosphate retention: 25 to 50 percent
Volcanic glass content: 70 to 100 percent
Paragravel plus gravel content, average: 0 to 25 percent
Lower part (loamy): 6 to 16 inches thick
Ammonium oxalate extractable Al plus 1/2 Fe: 0.2 to 0.4 percent
Phosphate retention: 10 to 25 percent
Volcanic glass content: 5 to 30 percent
Clay content, average: 12 to 17 percent
Rock fragment content, average: 2 to 35 percent
Diagnostic horizons and features:
Thickness of andic soil properties and depth to the loamy (2Bwc horizon): 20 to 33 inches
Cambic horizon: 6 to 16 inches thick
Duripan, depth below mineral soil surface: 26 to 40 inches
Depth to aquic conditions: 20 to 33 inches
Depth to common or many iron-manganese concentrations: 20 to 33 inches
A horizon
Hue: 7.5YR, 10YR, 2.5Y moist or dry
Value: 2 to 4 moist, 5 or 6 dry
Chroma: 2 or 3 dry
Pumice paragravel content: 0 to 15 percent
Gravel content: 0 to 5 percent
Reaction: moderately acid or slightly acid (pH 5.6 to 6.5)
AB horizon
Hue: 7.5YR, 10YR, 2.5Y moist or dry
Value: 3 to 5 moist, 5 or 6 dry
Chroma: 2 to 4 moist, 2 or 3 dry
Texture: ashy loamy coarse sand, ashy coarse sand, paragravelly ashy coarse sand
Pumice paragravel content: 0 to 25 percent
Gravel content: 0 to 5 percent
Reaction: moderately acid or slightly acid (pH 5.6 to 6.5)
2Bwc horizon
Hue: 7.5YR or 10YR moist or dry
Value: 4 or 5 moist
Chroma: 2 or 3 moist or dry
Texture: ashy loam, gravelly ashy loam
Clay content: 12 to 17 percent
Pumice paragravel content: 0 to 5 percent
Gravel content: 2 to 35 percent
Reaction: slightly (pH 6.1 to 6.5)
2Bqm horizon
Texture: cemented material, cemented gravelly material
Gravel content: 2 to 20 percent
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING:
Landscape - lava plateau and valleys
Landform - drainageways
Elevation - 4580 to 5590 feet
Slope - 0 to 2 percent
Parent material alluvium from tephra over alluvium or residuum from basalt
Climate - cold moist winters and cool dry summers
Mean annual air temperature - 40 to 44 degrees F
Mean annual precipitation - 20 to 24 inches
Frost-free period - 5 to 35 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Bigtop soils - poorly drained, have an aquic and xeric moisture regime and an argillic horizon with greater than 35 percent clay.
Bottlespring soils - well drained, have a xeric moisture regime, an argillic horizon with greater than 35 percent clay over a duripan
Maset soils - well drained, have a xeric moisture regime and are 20 to 40 inches deep to bedrock.
Shukash soils - somewhat excessively drained, have a xeric moisture regime and are greater than 60 inches deep.
DRAINAGE AND PERMEABILITY:
Drainage - somewhat poorly
Permeability - very slow
Watertable - a seasonal water table perched on the duripan is at its uppermost limit (AB horizon) in May or June, and present April to August
USE AND VEGETATION: Shortnap soils are used for livestock grazing, wildlife habitat, watershed and recreation. Plant association is lodgepole pine/kinnikinnick pumice. Common understory species include kinnikinnick, timber oatgrass, squirreltail, Idaho fescue, common yarrow, longstalk clover and slender cinquefoil.
DISTRIBUTION AND EXTENT: Klamath County, Oregon; MLRA 6. Series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES PROPOSED: Winema National Forest, Klamath County, Oregon, 2008
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon
Andic soil properties - 1 to 21 inches (A and AB horizons)
Aquic conditions with episaturation - 21 to 35 inches (2Bwc horizon)
Cambic horizon - 21 to 35 inches (2Bwc horizon)
Duripan - 35 to 39 inches (2Bqm horizon)
Particle-particle size control section - 1 to 35 inches (A, AB and Bwc horizons); 1 to 21 inches ashy and glassy; and 21 to 35 inches loamy and isotic.
AB horizon does not meet criteria for aquic conditions.
ADDITIONAL DATA:
NASIS SITE ID - 02-JFD-03; NASIS PEDON ID - 02OR683003
NSSL analysis on 21 to 35 inch layer (2Bwc horizon), sample number - S02OR-035-004