LOCATION LOUPLOUP WAEstablished Series
TAXONOMIC CLASS: Ashy over loamy, glassy over isotic, frigid Typic Vitrixerands
TYPICAL PEDON: Louploup ashy silt loam - on a southeast-facing 3 percent slope at 2,940 feet elevation under a Douglas-fir canopy. (Colors are for dry soil unless otherwise noted)
Oi--0 to 2 inches; slightly decomposed needles, leaves, and twigs.
Oe--2 to 3 inches; moderately decomposed litter.
A--3 to 9 inches; brown (10YR 5/3) ashy silt loam, dark brown (10YR 3/3) moist; weak fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; common fine and medium roots; slightly acid (pH 6.2); clear wavy boundary. (3 to 9 inches thick)
Bw--9 to 25 inches; pale brown (10YR 6/3) ashy silt loam, brown (10YR 4/3) moist; weak medium and coarse subangular blocky structure; soft, very friable, nonsticky and nonplastic; common fine, medium, and coarse roots; 5 percent gravel; slightly acid (pH 6.2); clear wavy boundary. (10 to 23 inches thick)
2CB--25 to 49 inches; light gray (10YR 7/2) sandy loam, brown (10YR 5/3) moist; massive; hard, friable, nonsticky and nonplastic; common fine and medium roots; 10 percent gravel; neutral (pH 6.6); gradual wavy boundary. (5 to 31 inches thick)
2Cd--49 to 60 inches; light gray (2.5Y 7/2) gravelly sandy loam, grayish brown (2.5Y 5/2) moist; massive; hard, friable, nonsticky and nonplastic; 15 percent gravel; neutral (pH 6.8).
TYPE LOCATION: Colville Indian Reservation; Okanogan County, Washington; about 4.5 miles southeast of the town of Disautel; 400 feet east, 1,500 feet north of the southwest corner of sec. 34, T. 33 N., R. 29 E., W.M.
RANGE IN CHARACTERISTICS: The mean annual soil temperature is 41 to 46 degrees F. The soil is usually moist but is dry in all parts between 4 and 12 inches for 75 to 90 consecutive days following the summer solstice. Thickness of the volcanic ash mantle and depth to the lithologic discontinuity ranges from 14 to 30 inches. Depth to a densic contact is 40 to 60 inches. The upper part of the particle-size control section has an estimated moist bulk density of 0.65 to 0.85 g/cc, volcanic glass content of 30 to 60 percent, acid-oxalate extractable aluminum plus one-half of the acid-oxalate extractable iron of 1.0 to 2.0 percent, 15-bar water retention of 5 to 12 percent for air dried samples and 0 to 10 percent gravel. The lower part of the particle-size control section has 5 to 10 percent clay and 15 to 35 percent rock fragments. Reaction is slightly acid to neutral.
The A horizon has a value of 5 to 8 dry, 3 or 4 moist, and chroma of 2 or 3 dry, 1 to 3 moist. Mollic colors are only present in the upper 3 to 6 inches. It has 0 to 10 percent gravel.
The Bw horizon has value of 6 or 7 dry, 3 to 5 moist, and chroma of 3 or 4 dry or moist. It is ashy silt loam, ashy loam, or ashy fine sandy loam, and has 0 to 15 percent gravel.
The 2CB horizon, where present, has hue of 10YR or 2.5Y, value of 6 or 7 dry, 4 or 5 moist, and chroma of 2 to 4 dry or moist. It is fine sandy loam, sandy loam, or coarse sandy loam, and may be gravelly. It has 5 to 25 percent gravel and 0 to 5 percent cobbles.
Some pedons have a 2Bw or 2BC horizon instead of a 2CB horizon.
The 2Cd horizon has a hue of 10YR or 2.5Y, value of 4 to 8 dry, 4 to 6 moist, and chroma of 2 to 4 dry or moist. Some pedons have common, large, faint to distinct mottles. It is gravelly sandy loam or gravelly coarse sandy loam. In some pedons, it ranges to very gravelly loamy sand below 40 inches. It has 15 to 35 percent gravel, 0 to 15 percent cobbles, and 0 to 5 percent stones.
COMPETING SERIES: These are the Eloika and Tillicum series. Eloika soils are dry for 45 to 60 consecutive days and lack a 2Cd horizon. Tillicum soils are dry for 60 to 75 consecutive days and have 10 to 40 percent weathered schist or gneiss rock fragments in the lower part of the particle-size control section.
GEOGRAPHIC SETTING: Louploup soils are on till plains and mountains at elevations from 2,000 to 5,500 feet. Slopes are 0 to 45 percent. The soils are formed in volcanic ash over glacial till. The climate is characterized by warm, dry summers and cold, moist winters. The mean annual precipitation is 17 to 26 inches. The mean January temperature is about 22 degrees F, mean July temperature is about 63 degrees, and the mean annual air temperature is 39 to 44 degrees F. The frost-free season is 85 to 120 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Apex, Donavan, Goddard, Koepke, Loony, Merkel, Mineral, Molson, Neuske, Nevine, Resner, Stepstone,. Apex, Goddard, and Merkel soils have a volcanic ash mantle 7 to 14 inches thick. Also, Goddard soils are sandy-skeletal, Loony soils are 20 to 40 inches deep to a densic contact. Merkel soils are loamy-skeletal. Nevine soils are ashy over loamy-skeletal. Donavan, Koepke, and Molson soils have a mollic epipedon. In addition, Donavan soils are mesic. Mineral soils have a lithic contact at 20 to 40 inches. Neuske soils are fine-loamy. Resner soils are cryic. Stepstone soils are ashy over sandy or sandy-skeletal.
DRAINAGE AND PERMEABILITY: Well drained; slow to rapid runoff; moderate over slow permeability.
USE AND VEGETATION: This soil is used for woodland, grazed woodland, wildlife habitat, and recreation. Native vegetation is Douglas-fir, ponderosa pine, and western larch, with an understory of common snowberry, Saskatoon serviceberry, pinegrass, mallow ninebark, creambush oceanspray, creeping Oregon-grape, pachystima, black mountain huckleberry, kinnikinnick and longtube twinflower.
DISTRIBUTION AND EXTENT: North central Washington. The series is moderately extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Colville Indian Reservation, Okanogan County, Washington, 1987.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - the zone from 0 to 9 inches (Oi, Oe, and A horizons)
Cambic horizon - the zone from 9 to 25 inches (Bw horizon)
Particle-size control section - the zone from 3 to 43 inches (A,Bw, and part of the 2CB horizon)
The 2/2004 description reflects a change in classification from ashy over loamy, mixed, frigid Typic Vitrixerands to ashy over loamy, glassy over isotic, frigid Typic Vitrixerands.