LOCATION POORMAN ID+UTEstablished Series
TAXONOMIC CLASS: Coarse-loamy, paramicaceous, frigid Andic Hapludalfs
TYPICAL PEDON: Poorman ashy loam, forested, on a 44 percent slope at 3,850 feet elevation. Aspect is west. When described on May 1, 1995, the soil was moist throughout. (Colors are for dry soil unless otherwise noted).
Oi--0 to 1 inches; slightly decomposed needles, twigs and leaves. (0 to 3 inches thick)
A--1 to 3 inches; brown (7.5YR 4/3) ashy loam, very dark brown (7.5YR 2.5/3) moist; weak fine subangular blocky structure parting to moderate fine and medium granular; soft, very friable, slightly sticky and nonplastic; common very fine and few fine roots; many very fine, common fine and few medium irregular pores; slightly acid (pH 6.2); abrupt wavy boundary. (1 to 8 inches thick)
Bw1--3 to 9 inches; yellowish brown (10YR 5/4) ashy loam, dark brown (7.5YR 3/4) moist; weak very fine, fine and medium subangular blocky structure; soft, very friable, slightly sticky and nonplastic; many very fine, common fine and few medium and coarse roots; many very fine and few fine and medium irregular pores; 2 percent fine mica flakes; moderately acid (pH 6.0); clear wavy boundary.
Bw2--9 to 13 inches; light yellowish brown (10YR 6/4) ashy loam, dark brown (7.5YR 3/4) moist; weak very fine, fine and medium subangular blocky structure parting to moderate fine granular; soft, very friable, slightly sticky and nonplastic; many very fine, common fine and few medium and coarse roots; many very fine and few fine and medium irregular pores; 10 percent fine mica flakes; moderately acid (pH 5.9); abrupt wavy boundary. (Bw horizons 4 to 12 inches thick)
2Bt1--13 to 21 inches; brown (10YR 5/3) loam, brown (10YR 4/3) moist; moderate medium and coarse subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine and few fine, medium and coarse roots; many very fine and few fine tubular, and common very fine irregular pores; few faint clay films on faces of peds and lining pores; 50 percent fine mica flakes; moderately acid (pH 5.8); clear wavy boundary.
2Bt2--21 to 29 inches; pale brown (10YR 6/3) loam, dark yellowish brown (10YR 4/4) moist; weak fine, medium and coarse subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine and few fine and medium roots; common very fine tubular, many very fine and few fine irregular pores; few faint clay films lining pores; 2 percent gravel; 55 percent fine mica flakes; moderately acid (pH 5.7); diffuse wavy boundary. (2Bt horizons 13 to 43 inches thick)
2BC--29 to 36 inches; light yellowish brown (10YR 6/4) gravelly loam, dark yellowish brown (10YR 4/4) moist; weak medium and coarse subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few very fine, fine and medium roots; common very fine irregular and few very fine and fine tubular pores; 10 percent gravel and 5 percent cobbles; 65 percent fine mica flakes; strongly acid (pH 5.5); clear wavy boundary. (0 to 15 inches thick)
2C1-- 36 to 52 inches; light yellowish brown (10YR 6/4) sandy loam, dark yellowish brown (10YR 4/4) moist; massive; slightly hard, very friable, slightly sticky and nonplastic; few very fine, fine and medium roots; common very fine and few fine irregular pores; 1 percent gravel and 2 percent cobbles; 80 percent fine mica flakes; moderately acid (pH 5.7); clear wavy boundary. (0 to 18 inches thick)
2C2--52 to 61 inches; very pale brown (10YR 8/4) sandy loam, brownish yellow (10YR 6/6) moist; massive; slightly hard, very friable, nonsticky and slightly plastic; few very fine, fine and medium roots; few very fine irregular and few fine tubular pores; 5 percent gravel; 50 percent fine mica flakes; strongly acid (pH 5.5).
TYPE LOCATION: Clearwater County, Idaho; about 4 miles north and 6 miles west of Pierce, Idaho; about 2,200 feet south and 2,600 feet west of the northeast corner of section 10, T. 37 N., R. 4 E.; Latitude - 46 degrees, 33 minutes, 54 seconds North; Longitude - 115 degrees, 56 minutes, 13 seconds West. USGS Whiskey Butte Quadrangle.
RANGE IN CHARACTERISTICS:
Average annual soil temperature - 39 to 45 degrees F.
Depth to argillic horizon - 10 to 12 inches from the mineral soil surface.
Weighted average of mica in control section is greater than 35 percent.
Thickness of volcanic ash mantle - 9 to 13 inches
Volcanic glass - 5 to 33 percent
Acid-oxalate Al + 1/2 Fe - 1.2 to 2.3 percent
15 bar water retention - 8.0 to 16.5 percent
Phosphate retention - 60 to 95 percent
A horizon
Hue - 7.5YR or 10YR dry or moist
Value - 4 or 5 dry and 2 or 3 moist
Chroma - 3 or 4 dry and 2 to 4 moist
Texture - Ashy-SIL, Ashy-L
Clay content - 6 to 10 percent
Rock fragments - 0 to 3 percent gravel
Bulk density - 0.65 to 0.95 g/cc
Reaction - moderately acid to neutral
Bw horizons
Hue - 7.5YR or 10YR dry or moist
Value - 5 or 6 dry and 3 or 4 moist
Chroma - 4 to 6 dry
Texture - Ashy-SIL, Ashy-L
Clay content - 8 to 10 percent
Rock fragments - 0 to 3 percent gravel
Mica content - 1 to 10 percent
Bulk density - 0.75 to 1.00 g/cc
Reaction - moderately acid to neutral
2Bt horizons
Hue - 7.5YR or 10YR moist
Value - 5 to 7 dry and 3 to 5 moist
Chroma - 3 to 6 dry or moist
Clay content - 12 to 20 percent
Texture - L, SL, GR-L, GRV-SL, FSL, SIL, CB-L, GR-SL
Rock fragments - 0 to 35 percent gravel and 0 to 10 percent cobbles, 0 to 40 percent total rock fragment content
Mica content - 15 to 70 percent
Reaction - very strongly acid to slightly acid
2BC horizon
Value - 5 to 8 dry and 3 to 7 moist
Chroma - 3 to 6 dry or moist
Clay content - 12 to 16 percent
Texture - L, SL, GR-SL, GR-L, COSL
Rock fragments - 0 to 15 percent gravel and 0 to 5 percent cobbles, 0 to 15 percent total rock fragment content
Mica content - 15 to 80 percent
Reaction - very strongly acid to moderately acid
2C horizon
Hue - 2.5Y or 10YR moist
Value - 5 to 8 dry and 3 to 6 moist
Chroma - 3 to 6 dry, 3 to 8 moist
Clay content - 8 to 20 percent
Texture - SL, LS, GR-SL, L, COSL
Rock fragments - 0 to 25 percent gravel and 0 to 5 percent cobbles, 0 to 25 percent total rock fragment content
Mica content - 15 to 80 percent
Reaction - very strongly acid to moderately acid
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Poorman soils are on mountain slopes with elevations of 1,600 to 4,700 feet. Slopes are 15 to 75 percent. These soils formed in material from metamorphic rock with a thin mantle of volcanic ash. The average annual temperature is 38 to 44 degrees F. and the average annual precipitation is 30 to 55 inches. The frost free season is 50 to 110 days (9 in 10 years to 1 in 10 years, respectively).
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Aldermand, Brodeer, Grandad and Mushel series. Aldermand, Brodeer and Mushel soils are on mountain slopes and lack high amounts of mica in the substratum. Grandad soils are on mountain slopes and have an ash mantle greater than 14 inches thick.
DRAINAGE AND PERMEABILITY: Well drained, medium runoff and moderate permeability.
USE AND VEGETATION: These soils are used for timber production, wildlife habitat and watershed. Potential natural vegetation is western redcedar, grand fir, Douglas-fir, western larch, western white pine and lodgepole pine with an understory of queencup beadlily, goldthread,
bunchberry dogwood, longtube twinflower, common prince's pine, darkwoods violet, common snowberry, rocky mountain maple and Columbia brome.
DISTRIBUTION AND EXTENT: North central Idaho, Poorman soils are not extensive.
MLRA OFFICE RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Clearwater County, Idaho, 2003.
REMARKS: Diagnostic horizons and other features recognized in this pedon are:
Ochric epipedon - The zone from 1 to 3 inches (A horizon).
Volcanic ash mantle - The zone from 1 to 13 inches (A, Bw1 and Bw2 horizons).
Cambic horizon - The zone from 3 to 13 inches (Bw1 and Bw2 horizons).
Argillic horizon - The zone from 13 to 29 inches (2Bt1 and 2Bt2 horizons).
The ranges of values listed under the Range in Characteristics for the soil properties Bulk density, Volcanic glass content, Acid-oxalate Al + 1/2 Fe, Phosphate retention and 15-bar water retention are estimates only.