LOCATION KNORR WAEstablished Series
TAXONOMIC CLASS: Fine-loamy, isotic, isofrigid Typic Haplorthods
TYPICAL PEDON: Knorr gravelly loam-forestland on a 43 percent east-northeasterly aspect at an elevation of 2,860 feet in a Pacific silver fir/Alaska huckleberry-oxalis plant association. (When described on July 10, 1997, the soil was moist throughout. Colors are for moist soil unless otherwise stated. All textures are apparent field textures.)
Oi--0 to 1 inch; slightly decomposed needles, leaves, twigs, and cone fragments; abrupt smooth boundary. (0.5 to 1.5 inches thick)
Oa--1 to 2 inches; highly decomposed organic materials; abrupt smooth boundary. (0.5 to 3 inches thick)
E--2 to 10 inches; 90 percent light brownish gray (10YR 6/2) gravelly loam, light gray (10YR 7/1) dry and 10 percent very dark brown (10YR 2/2), very dark grayish brown (10YR 3/2) dry; massive; hard and hydrophobic, friable, slightly sticky and slightly plastic; common very fine, fine, medium, and coarse roots; common very fine and fine tubular and irregular pores; 20 percent gravel; extremely acid (pH 3.6); abrupt smooth boundary. (3 to 9 inches thick)
Bhs1--10 to 17 inches; 85 percent strong brown (7.5YR 5/6) gravelly loam, very pale brown (10YR 7/4) dry and 15 percent dark brown (7.5YR 3/2), brown (7.5 YR 4/3) dry; weak very fine, fine, and medium subangular blocky structure; hard, firm, slightly sticky and slightly plastic; weakly smeary; common very fine, fine, medium, and coarse roots; common very fine and fine tubular and irregular pores; 15 percent gravel; very strongly acid (pH 4.6); clear wavy boundary.
Bhs2--17 to 22 inches; dark yellowish brown (10YR 3/6) strong brown (7.5YR 5/6) and light olive brown (2.5Y 5/3) gravelly loam, very pale brown (10YR 7/4), reddish yellow (7.5YR 7/6), and light gray (2.5Y 7/2) dry; weak very fine, fine, and medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; weakly smeary; few very fine, fine, and medium roots; few very fine and fine tubular and irregular pores; 20 percent gravel; very strongly acid (pH 4.6); abrupt wavy boundary. (Combined thickness of the Bhs horizon is 8 to 15 inches.)
Bh--22 to 26 inches; very dark brown (10YR 2/2) gravelly loam, dark grayish brown (10YR 4/2) dry; weak very fine, fine, and medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; weakly smeary; few very fine, fine, and medium roots; few very fine and fine tubular and irregular pores; 25 percent gravel, 5 percent cobbles; very strongly acid (pH 4.6); abrupt wavy boundary. (2 to 5 inches thick)
Bw--26 to 33 inches; strong brown (7.5YR 4/6) very gravelly sandy loam, reddish yellow (7.5YR 6/6) dry; weak very fine and fine subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; weakly smeary; few very fine roots; few very fine and fine tubular and irregular pores; 40 percent gravel, 10 percent cobbles; very strongly acid (pH 4.8); abrupt wavy boundary. (5 to 11 inches thick)
R--33 inches; hard metasedimentary rock.
TYPE LOCATION: Jefferson County, Washington, about 6 miles north-northwest of the Quinault River Ranger Station, about 1,480 feet west and 900 feet south of the northeast corner of Section 7, T. 24 N., R. 9 W. (Latitude 47 degrees, 35 minutes, 20 seconds N., Longitude 123, degrees 51 minutes, 48 seconds W.)
RANGE IN CHARACTERISTICS: Mean annual soil temperature is 43 to 47 degrees F. The mean summer soil temperature is 47 to 50 degrees F. and the mean winter soil temperature is 40 to 45 degrees F. The difference between the mean winter and mean summer soil temperature is 5 to 9 degrees F. These soils are usually moist and have a surplus of available water on a monthly basis throughout the year; perudic moisture regime. Depth to bedrock is 20 to 40 inches. The particle-size control section from 10 inches to the bedrock contact has an estimated moist bulk density of 0.70 to 0.90 g/cc, acid-oxalate extractable aluminum plus one half of the acid-oxalate extractable iron of 1 to 2 percent, phosphate retention of 40 to 85 percent, and 15-bar water retention of 10 to 20 percent for air dried samples. The particle-size control section has 15 to 25 percent field estimated clay and 30 to 55 percent sand. Base saturation is less than 10 percent by ammonium acetate throughout the profile.
The E horizon (albic materials)has value of 5 or 6 moist and 7 or 8 dry and chroma of 1 or 2 moist and dry. It has 5 to 20 meq/100g of extractable aluminum. It has 1 to 5 percent organic matter. NaF pH is 7.0 to 8.5.
The Bhs horizon has hue of 7.5YR moist, 7.5YR or 10YR moist and dry, value of 3 through 5 moist and 4 through 7 dry, and chroma of 2, 4, or 6 moist and 3, 4, or 6 dry. It is gravelly loam or loam. Reaction is extremely acid or very strongly acid. It has 5 to 20 meq/100g of extractable aluminum. It has 3 to 6 percent organic matter. NaF pH is 8.5 to 10.0.
The Bh horizon has 4 to 6 percent organic matter. NaF pH of 8.5 to 10.0 and 5 to 20 meq/100g of extractable aluminum.
The Bw horizon has hue of 10YR or 7.5YR moist and dry, value of 2 through 4 moist and 4 through 7 dry, and chroma of 2, 3, or 6 moist and 2, 3, 4, or 6 dry. It is gravelly loam, very gravelly sandy loam or very gravelly loam.
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Knorr soils are on glaciated moderate relief mountain slopes. Slopes are 20 to 50 percent. The soils are formed in residuum and colluvium from sedimentary and metasedimentary rocks. Elevations are 2000 to 3000 feet. Average annual precipitation is 170 to 210 inches. Fog drip contributes to the effective precipitation totals. Average annual temperature is 41 to 43 degrees F. The frost-free season is 120 to 140 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bunch, Hookbranch, Kestner, Lunchcreek, Samsriver, Snahopish, and Solleks soils. Bunch soils are deep and very deep. Hookbranch and Lunchcreek soils are on mountain slopes and mountain headwalls and lack albic and spodic materials. Lunchcreek soils are also deep and very deep. Kestner soils are on glacial valleys, have a udic soil moisture regime, are underlain by dense till at 20 to 40 inches and are moderately well drained. Samsriver soils are on glaciated mountain slopes and are moderately deep to dense till and are moderately well drained. Snahopish soils have a udic moisture regime and are deep and very deep and lack albic and spodic materials. Solleks soils have a udic soil moisture regime and lack albic and spodic materials.
DRAINAGE AND PERMEABILITY: Well drained; moderate permeability.
USE AND VEGETATION: Timber production, wildlife habitat, recreation, and watershed. Native vegetation is western hemlock, Pacific silver fir, Alaska huckleberry, Oregon oxalis, deer fern, queencup beadlily, five leaf bramble, and false lily-of-the-valley.
DISTRIBUTION AND EXTENT: Jefferson County, Washington; MLRA 1. Series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Jefferson County, Washington, 2000; Olympic National Forest.
REMARKS: Diagnostic horizons and features recognized in this pedon are the following:
Albic horizon - 2 to 10 inches (E horizon)
Spodic horizon - 10 to 26 inches (Bhs and Bh horizons)
Cambic horizon - 26 to 33 inches (Bw horizon)
Lithic contact - 33 inches
PSCS - 12 to 33 inches (Bs, Bhs and Bw horizons)
This soil has a perudic moisture regime.
All depths to diagnostic horizons and other features are measured from the top of the first mineral horizon.
ADDITIONAL DATA: NSSL pedon S98WA-031-001.