LOCATION JEBE WAEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, mesic Ultic Argixerolls
TYPICAL PEDON: Jebe gravelly loam - forested on a 70 percent northwest-facing side slope at an elevation of 1,500 feet. (Colors are for dry soils unless otherwise noted.)
A1--0 to 5 inches; dark grayish brown (10YR 4/2) gravelly loam, very dark brown (10YR 2/2) moist; weak fine granular structure; soft, very friable, nonsticky and nonplastic; many very fine and fine roots; many fine irregular pores; 25 percent gravel and 5 percent cobbles; moderately acid (pH 5.8); clear smooth boundary.
A2--5 to 13 inches; grayish brown (10YR 5/2) very gravelly loam, very dark grayish brown (10YR 3/2) moist; weak fine subangular blocky structure; soft, friable, nonsticky and slightly plastic; many very fine, fine, and medium roots; many fine irregular and common fine tubular pores; 25 percent gravel and 15 percent cobbles; moderately acid (pH 5.8); clear wavy boundary. (Combined thickness of the A horizon is 10 to 20 inches)
BA--13 to 31 inches; brown (7.5YR 5/4) very gravelly loam, dark brown (7.5YR 3/4) moist; weak fine and medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine, fine, and medium roots; common fine and medium tubular pores; 30 percent gravel and 10 percent cobbles; moderately acid (pH 6.0); gradual wavy boundary. (15 to 18 inches thick)
Bt1--31 to 43 inches; brown (7.5YR 5/4) very gravelly loam, dark brown (7.5YR 3/4) moist; moderate fine and medium subangular blocky structure; slightly hard; firm, slightly sticky and moderately plastic; common fine roots; common fine tubular pores; few faint clay films on faces of peds and in pores; 40 percent gravel, 20 percent cobbles and 10 percent basalt paragravel; slightly acid (pH 6.2); gradual wavy boundary. (10 to 14 inches thick)
Bt2--43 to 60 inches; light brown (7.5YR 6/4) extremely gravelly clay loam, dark brown (7.5YR 3/4) moist; moderate medium subangular blocky structure; slightly hard, firm, slightly sticky and moderately plastic; few fine roots; few fine tubular pores; few faint clay films on faces of peds and in pores; 50 percent gravel, 15 percent cobbles and 15 percent basalt paragravel; slightly acid (pH 6.2).
TYPE LOCATION: Klickitat County, Washington, 3 miles northwest of Snowden about 100 feet north and 1,750 feet west of the southeast corner of section 10, T. 4 N., R. 11 E.
RANGE IN CHARACTERISTICS: These soils are usually moist but are dry in the moisture control section for 45 to 60 consecutive days following summer solstice. The mean annual soil temperature is 47 to 50 degrees F. The particle-size control section is 35 to 55 percent rock fragments and 10 to 20 percent pararock fragments on a weighted average. The mollic epipedon is 10 to 16 inches thick. Clay content in the control section averages from 18 to 30 percent.
The A horizon has hue of 5YR to 10YR, value of 4 or 5 dry, 2 or 3 moist and chroma of 2 or 3 dry and moist. Reaction is strongly acid or moderately acid.
The BA horizon, or BAt horizon when present, has hue of 7.5YR or 10YR, value of 5 or 6 dry and chroma of 3 or 4 moist. Texture is very gravelly loam or very cobbly loam. It has 15 to 20 percent clay. Reaction is moderately acid or slightly acid.
The Bt horizon has hue of 7.5YR or 10YR and value of 5 or 6 dry. Texture is very cobbly loam, very gravelly loam or extremely gravelly clay loam. It has 20 to 30 percent clay. Reaction is moderately acid or slightly acid.
COMPETING SERIES: These are the
Balake,
Beezee,
Bluesprin,
Fordice,
Hunsinger,
Jellico,
Keuterville,
Legall,
Nashmead,
Riverpoint,
Sauter,
Shanks (T), and
Sienna, series.
Balake soils dry for 60 to 75 consecutive days following the summer solstice; lack parafragments in the argillic horizon; particle-size control section dominated by rock fragments of conglomerate and alluvial origin
Beezee soils dry for 60 to 75 consecutive days following the summer solstice
Bluesprin soils 20 to 40 inches to a lithic contact (basalt); dry for 60 to 80 consecutive days following the summer solstice
Fordice soils dry for 60 to 90 consecutive days following the summer solstice; particle-size control section dominated by rounded and subrounded rock fragments of volcanic alluvial origin
Hunsinger soils 40 to 60 inches to a lithic contact (basalt); dry for 120 to 140 consecutive days following the summer solstice
Jellico soils 20 to 40 inches to a lithic contact (basalt); dry for 110 to 130 consecutive days following the summer solstice
Keuterville soils lack parafragments in the particle-size control section; as described, this series is very similar to the Jebe soil although the 18 to 28 inch mean annual precipitation range and associated ponderosa pine/bluebunch plant community seem to be drier than a 45 to 60 consecutive dry day zone
Legall soils - dry for 75 to 90 consecutive days following the summer solstice; mean annual soil temperature is 50 to 53 degrees F.
Nashmead soils 40 to 60 inches to a lithic contact (sandstone or shale); dry for greater than 120 consecutive days following the summer solstice; mean annual soil temperature is 54 to 59 degrees F.
Riverpoint soils - dry for 60 to 90 consecutive days following the summer solstice; 15 to 40 inches to a lithologic discontinuity; particle-size control section dominated by 35 to 60 percent rock fragments of granodiorite alluvial origin
Sauter soils - dry for 60 to 75 consecutive days following the summer solstice; lack parafragments in the argillic horizon; mollic epipedon 16 to 20 inches thick
Shanks soils 20 to 40 inches to a lithic contact (grandodiorite); dry for 60 to 90 consecutive days following the summer solstice; lack parafragments in the argillic horizon
Sienna soils 20 to 40 inches to a lithic contact (basalt); dry for 75 to 90 consecutive days following the summer solstice; particle-size control section dominated by 35 to 60 percent rounded quartzitic rock fragments
The
Bluenose,
Gavel, and
Tekoa series have similar classifications.
Bluenose soils active CEC activity class; dry for greater than 120 consecutive days following the summer solstice
Gavel soils vitrandic subgroup; 20 to 40 inches to a paralithic contact (andesite or basalt)
Tekoa soils vitrandic subgroup; 20 to 40 inches to a lithic contact (shale); dry for 60 to 75 consecutive days following the summer solstice
GEOGRAPHIC SETTING: Jebe soils are on north-facing canyon side slopes at elevations of 300 to 2,800 feet. Slopes are 30 to 90 percent. They formed colluvium derived from basalt mixed with loess and a minor influence of volcanic ash. Summers are warm and dry; winters are cool and wet. The mean annual precipitation is 35 to 45 inches. The average January temperature is 28 degrees F. and the average July temperature is 65 degrees F. The mean annual temperature is 46 to 49 degrees F. The frost-free season is 110 to 130 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Chemawa, Hood, McGowan, Para, and the competing Beezee soils. Chemawa soils are ashy. Hood, McGowan, and Para soils are fine-loamy.
DRAINAGE AND PERMEABILITY: Well drained; medium to rapid runoff; moderate permeability.
USE AND VEGETATION: These soils are used mainly for timber production, grazable woodland, wildlife habitat and recreation. Native vegetation is Douglas-fir, ponderosa pine, and some grand fir and bigleaf maple, with an understory of vine maple, western hazel, creambush oceanspray, Oregon-grape, and rose.
DISTRIBUTION AND EXTENT: Klickitat County, Washington; MLRA 6. The series is of small extent.
MLRA OFFICE RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Klickitat County, Washington, 2003.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - the zone from 0 to 13 inches
Argillic horizon - the zone from 31 to 60 inches.
Particle-size control section - the zone from 31 to 51 inches.