LOCATION CHEMULT ORTentative Series
TAXONOMIC CLASS: Loamy over ashy or ashy-pumiceous, mixed over glassy, active, nonacid Histic Cryaquepts
TYPICAL PEDON: Chemult mucky peat supporting the willow/Northwest Territory sedge plant association on a 2 percent slope at 5,200 feet. When described on 28 October 1998 the soil was wet throughout (colors are for moist soil unless otherwise noted).
Oe--0 to 8 inches; very dark grayish brown (10YR 3/2) mucky peat, dark grayish brown (10YR 4/2) dry; fiberous; slightly hard, very friable, non-sticky and non-plastic; many very fine and common fine roots, few medium roots; 80 percent non-rubbed fiber of herbaceous material; 25 percent rubbed fiber; strongly acid (pH 5.4); abrupt smooth boundary. (8 to 14 inches thick)
A--8 to 20 inches; black (10YR 2/1) mucky diatomaceous silt; light brownish gray (10YR 6/2) dry, grayish brown (10YR 5/2) dried and remoistened; weak coarse subangular blocky structure; slightly hard, very friable, non-sticky and slightly plastic; few very fine roots; 30 percent non-rubbed fiber of herbaceous material, trace rubbed fiber; strongly acid (pH 5.4); abrupt smooth boundary. (4 to 24 inches thick)
ALdi--20 to 24 inches; dark gray (2.5Y 4/1) diatomaceous silt, moist; light brownish gray (10YR 6/2) dry, grayish brown (10YR 5/2) dried and remoistened; massive; hard, very friable, non-sticky and slightly plastic; few very fine roots; strongly acid (pH 5.4); abrupt smooth boundary. (0 to 24 inches thick)
2BCc--24 to 63 inches; light brownish gray (10YR 6/2) paragravelly ashy loamy coarse sand, dark grayish brown (2.5Y4/2) moist; massive; soft, very friable, non-sticky and non-plastic; may fine irregular pores; 20 percent pumice paragravel; few fine distinct yellowish brown (10YR 5/4) iron-manganese nodules in matrix, very dark grayish brown (10YR 3/2) moist; common fine prominent black (2.5Y 2.5/1) manganese nodules in matrix, distinct black (2.5Y 2.5/1) moist; common medium prominent black (2.5Y 2.5/1) manganese masses in matrix, distinct black (2.5Y 2.5/1) moist; moderately acid (pH 5.6). (16 to greater than 40 inches thick)
TYPE LOCATION: Klamath County, Oregon, about 9 miles east of Chemult, about 880 feet west and 2280 feet south of the northeast corner of section 14, T. 27 S., R. 9 E. (Latitude 43 degrees, 14 minutes, 1 second North, Longitude 121 degrees, 36 minutes, 34 seconds West)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature - 35 to 40 degrees F
Mean winter soil temperature - 32 to 35 degrees F
Mean summer soil temperature - 40 to 43 degrees F
Depth to aquic conditions - at the soil surface
Depth to limnic soil materials, diatomaceous earth: 8 to 14 inches
Thickness of limnic soil materials, diatomaceous earth: 14 to 40 inches
Oe horizon
Thickness: 8 to 14 inches
Hue, non-rubbed: 10YR dry or moist
Value, non-rubbed: 3 or 4 dry, 2 or 3 moist
Chroma, non-rubbed: 1 or 2 dry or moist
Non-rubbed fiber content: 80 to 95 percent
Rubbed fiber content: 20 to 50 percent
Reaction: strongly acid or moderately acid (pH 5.1 to 6.0)
A horizon
Depth to: 8 to 14 inches
Thickness: 4 to 24 inches
Hue, non-rubbed: 10YR dry, 10YR or 2.5Y moist, or dried and remoistened
Value, non-rubbed: 4, 5 or 6 dry; 2, 2.5 or 3 moist; 4, 5 or 6 dried and remoistened
Chroma, non-rubbed: 1 or 2 dry, moist, or dried and remoistened
Clay content: less than 8 percent
Silt content: greater than 90 percent
Organic matter content: 10 to 20 percent
Non-rubbed fiber content: 20 to 40 percent
Rubbed fiber content: less than 5 percent
n Value: greater than 1.0
Reaction: strongly acid or moderately acid (pH 5.1 to 6.0)
ALdi horizon
Depth to: 12 to 24 inches
Thickness: 0 to 24 inches
Hue: 10YR dry; 10YR or 2.5Y moist, or dried and remoistened
Value: 5 or 6 dry, 4 or 5 moist and fresh, 5 or 6 dried and remoistened
Chroma: 1 or 2 dry, moist, or dried and remoistened
Clay content: less than 8 percent
Silt content: greater than 90 percent
Pumice paragravel content: 0 to 10 percent
Organic matter content: 4 to 10 percent
n Value: greater than 0.7 percent
Reaction: strongly acid or moderately acid (pH 5.1 to 6.0)
Other: absent to common, medium (2 to 5 mm) lens of muck or ashy coarse sandy loam
2BCc horizon
Depth to: 24 to 48 inches
Thickness: 16 to greater than 40 inches
Hue: 10YR, 2.5Y or variegated dry or moist
Value: 5, 6, 7 or 8 dry; 4 or 6 moist
Chroma: 2, 3 or 4 dry or moist
Texture: ashy coarse sand or ashy loamy coarse sand
Pumice paragravel content: 0 to 60 percent
Volcanic glass content: 60 to 100 percent in the 0.02 to 2.0 mm fraction
Ammonium oxalate extractable Al plus 1/2 Fe: 0.4 to 1.0 percent
Phosphate retention: 25 to 35 percent
Redoximorphic features: absent to common, fine or medium iron masses; absent to common iron surface coats; common or many, fine manganese nodules; few or common, fine iron-manganese nodules; absent to common, fine or medium manganese masses
Reaction: moderately acid or slightly acid (pH 5.6 to 6.5)
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING:
Landscape - lava plateau
Landform- flood plains
Elevation- 4560 to 5415 feet
Slope- 0 to 2 percent
Parent material - organic grassy material over diatomaceous earth over alluvium from Mt. Mazama ash and pumice
Climate- cold, moist winters and cool, dry summers
Mean annual air temperature - 41 to 45 degrees F
Mean January air temperature - 25 to 27 degrees F
Mean July air temperature - 57 to 60 degrees F
Mean annual precipitation - 20 to 36 inches
Frost free period - 5 to 35 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Lapine, Chinchallo and Cosbie soils. Lapine soils are on adjacent plateaus formed in volcanic ash and pumice, are excessively drained. Chinchallo soils have an ochric epipedon over diatomaceous earth having an n Value of less than 0.7. Cosbie soils are in nearby drainageways and have an ochric epipedon.
DRAINAGE AND PERMEABILITY:
Drainage - very poorly drained
Permeability- very slow
Flooding- very frequent
Ponding- frequent
Water table - an apparent high water table is at its uppermost limit from January to December
USE AND VEGETATION: Chemult soils are used for wildlife habitat, watershed and recreation. The potential natural plant community is the wet shrublands plant association group (SWXX). A willow/Northwest Territory sedge plant association (SW11-16) is commonly supported.
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, 2001
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Histic epipedon - from 0 to 8 inches (the Oe horizon)
Hemic soil material - from 0 to 8 inches (the Oe horizon)
Limnic soil materials, diatomaceous earth in a gelatinous or semi-gelatinous state - from 8 to 24 inches (the A and ALdi horizons)
n Value of greater than 0.7 - from 8 to 24 inches (the A1 and ALdi horizons)
Lithologic discontinuity - 24 inches
Particle-size control section - from 18 to 47 inches (portion of the A, the ALdi and portion of the 2BCc horizons)
Aquic conditions - endosaturation on 28 October 1998 from 0 to 63 inches (the Oe, A, ALdi and 2BCc horizons)
Moisture regime - aquic
Temperature regime - cryic
ADDITIONAL DATA: This pedon description is in NASIS pedon with Site ID 98-JFD-06.