LOCATION PINBIT WATentative Series
TAXONOMIC CLASS: Ashy, amorphic, mesic Humic Vitrixerands
TYPICAL PEDON: Pinbit ashy loam - forested on a 4 percent southwest-facing slope at an elevation of 1,800 feet. (Colors are for dry soil unless otherwise noted. All textures are apparent field textures.)
Oi--0 to 0.5 inches; needles, leaves, and twigs.
Oa--0.5 to 1 inch; decomposed organic material.
A--1 to 4 inches; brown (7.5YR 4/2) ashy loam, dark reddish brown (5YR 3/2) moist; weak very fine and fine granular structure; soft, very friable, slightly sticky and nonplastic; weakly smeary; many very fine and fine roots; many very fine irregular pores; 10 percent gravel;; slightly acid (pH 6.1); clear smooth boundary. (2 to 6 inches thick)
AB--4 to 11 inches; brown (10YR 5/3) ashy sandy loam, dark brown (7.5YR 3/2) moist; weak very fine and fine subangular blocky structure; soft, very friable, slightly sticky and nonplastic; weakly smeary; common very fine and fine and many medium roots; many very fine irregular and common fine tubular pores; 10 percent gravel; slightly acid (pH 6.4); gradual smooth boundary. (5 to 9 inches thick)
Bwl--11 to 25 inches; light yellowish brown (10YR 6/4) ashy sandy loam, dark brown (7.5YR 3/4) moist; weak very fine and fine subangular blocky structure; soft, very friable, slightly sticky and nonplastic; weakly smeary; common very fine and few coarse roots; common very fine irregular and few very fine tubular pores; 5 percent gravel; slightly acid (pH 6.4); gradual smooth boundary. (11 to 17 inches thick)
Bw2--25 to 41 inches; light yellowish brown (10YR 6/4) gravelly ashy loam, brown (7.5YR 4/3) moist; weak very fine and fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; weakly smeary; few very fine and fine and common medium roots; many very fine irregular and common very fine tubular pores; 15 percent gravel; slightly acid (pH 6.5); gradual smooth boundary. (10 to 16 inches thick)
Bw3--41 to 61 inches; light yellowish brown (10YR 6/4) very gravelly ashy loam, brown (7.5YR 4/4) moist; weak very fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; weakly smeary; few very fine and fine roots; many very fine irregular pores; 50 percent gravel; slightly acid (pH 6.5).
TYPE LOCATION: Klickitat County, Washington; about 5 miles east of Glenwood; 1,000 feet south of the northeast corner of section 9, T. 6 N., R. 13 E. Latitude 46 degrees 01 minutes 36 seconds N., and Longitude 121 degrees 10 minutes 36 seconds W.
RANGE IN CHARACTERISTICS: Mean annual soil temperature is 47 to 49 degrees F. The soil moisture control section is dry in all parts for 75 to 90 consecutive days within the 4 months that follow the summer solstice in 6 or more years out of 10. The 0 to 40 inch particle-size control section has an estimated moist bulk density of 0.75 to 0.90 g/cm3, volcanic glass content of 30 to 60 percent, ammonium oxalate extractable aluminum plus one-half iron of 1.0 to 2.0 percent, phosphate retention of 25 to 50 percent, and 15 bar water retention of 8 to 12 percent. Rock fragments in the control section average 5 to 20 percent. Below 40 inches rock fragments range from 5 to 50 percent. Some pedons have .01 to 0.1 percent of the surface covered with stones.
The A horizon has hue of 5YR, 7.5YR, or 10YR, value of 4 or 5 dry, 2 or 3 moist and chroma of 2 through 4 dry or moist. Texture is stony ashy loam, stony ashy sandy loam. or very stony ashy sandy loam.
The Bw horizon has hue of 7.5YR or 10YR, value of 5 or 6 dry, 3 through 5 moist and chroma of 3 or 4 dry or moist. Texture is ashy sandy loam, ashy loam, or gravelly ashy loam above 40 inches and below 40 inches it ranges to very gravelly ashy loam or very gravelly ashy sandy loam.
COMPETING SERIES: These are the
Chemawa,
Parkdale,
Surveyors (T), and
Trouter series.
Chemawa series - dry for 45 to 60 consecutive days;
Parkdale series - dry 45 to 60 consecutive days; solum 7 to 20 inches thick
Surveyors series - dry 75 to 90 consecutive days; 20 to 80 percent pararock fragments; 10 to 30 percent glass (vegetation appears frigid and indicates further investigation needed as to soil temperature)
Trouter series - dry 60 to 75 consecutive days; 20 to 40 inches to lithic contact
GEOGRAPHIC SETTING: Pinbit soils are on terraces at elevations of 1,700 to 2,100 feet. Slopes are 2 to 10 percent. Pinbit soils formed in volcanic ash and alluvium from basalt. Summers are warm and dry; winters are cool and moist, with snow cover from December through March. The mean annual precipitation is 28 to 32 inches. The average January temperature is 26 degrees F., and the average July temperature is 65 degrees F. The mean annual air temperature is 45 to 47 degrees F. The frost-free season is 85 to 105 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Glen, McCumber, Segidal, Trelk, and Yedlick soils. Glen soils are frigid, dry for 60 to 75 days, and are formed in alluvium on terraces. McCumber soils are on mountains and are ashy-skeletal. Segidal soils are on lacustrine terraces and have an aquic moisture regime. Trelk soils are on nearby landscapes and have a fine-loamy argillic horizon. Yedlick soils are on mountains and are loamy-skeletal.
DRAINAGE AND PERMEABILITY: Well drained; slow to medium runoff; moderate permeability.
USE AND VEGETATION: These soils are used mainly for timber production, livestock grazing, and wildlife habitat. Native vegetation is mainly ponderosa pine with an understory of antelope bitterbrush, elk sedge, and Idaho fescue.
DISTRIBUTION AND EXTENT: East slopes of the Cascade Mountains in Klickitat and Yakima Counties, Washington. MLRA 6. The series is of small extent.
MLRA OFFICE RESPONSIBLE: Portland, Oregon
SERIES PROPOSED: Klickitat County, Washington, 1976; Yakima Indian Reservation.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Umbric epipedon - the zone from 1 to 11 inches
Cambic horizon - the zone from 11 to 61 inches
Andic properties - the zone from 1 to 61 inches
Particle-size control section - the zone from 1 to 41 inches
Depth to diagnostic horizons and features are measured from the top of the first mineral layer.
Mineralogy based on associated Guler series lab data.
Classification revised 6/2004 from frigid to mesic Humic Vitrixerands based on correlation of a PIPO/PUTR/FEID plant association to this series concept.
12/2005- This series originally set up within the Klickitat County soil survey until boundary change with Yakima Indian Reservation soil survey in 2003.