LOCATION LONGJOHN OREstablished Series
TAXONOMIC CLASS: Ashy-skeletal, glassy Typic Vitricryands
TYPICAL PEDON: Longjohn gravelly coarse sandy loam, in forest on a 17 percent west facing slope. (Colors are for moist soil unless otherwise noted.)
Oi--1 inch to 0; pine needles
A1--0 to 1 inch; black (10YR 2/1) gravelly coarse sandy loam, dark grayish brown (10YR 4/2) dry; moderate fine granular structure; slightly hard, very friable, nonsticky and nonplastic; many roots; many irregular pores; 15 percent gravel; very strongly acid (pH 4.9); abrupt smooth boundary. (1 to 6 inches thick)
A2--1 to 5 inches; dark brown (10YR 3/3) gravelly coarse sandy loam, yellowish brown (10YR 5/4) dry; weak fine and medium granular structure; slightly hard, very friable, nonsticky and nonplastic; common roots; many irregular pores; 25 percent gravel; very strongly acid (pH 4.9); abrupt smooth boundary. (2 to 10 inches thick)
A3--5 to 13 inches; dark brown (10YR 3/3) very gravelly coarse sandy loam, brown (10YR 5/3) dry; weak fine and medium granular structure; slightly hard, very friable, nonsticky and nonplastic; common roots; many irregular pores; 40 percent gravel; strongly acid (pH 5.3); gradual wavy boundary. (0 to 13 inches thick)
Bw--13 to 24 inches; dark yellowish brown (10YR 4/4) very gravelly coarse sandy loam, light yellowish brown (10YR 6/4) dry; weak fine and medium subangular blocky structure; soft, very friable, nonsticky and nonplastic; common roots; many irregular pores; 45 percent gravel; strongly acid (pH 5.2); gradual wavy boundary. (10 to 20 inches thick)
C1--24 to 42 inches; brown (10YR 5/3) extremely cobbly coarse sandy loam, very pale brown (10YR 7/3) dry; massive; soft, very friable, nonsticky and nonplastic; common very fine roots and few fine and medium; many irregular pores; 5 percent stones, 25 percent cobbles, 40 percent gravel; strongly acid (pH 5.3); gradual wavy boundary. (15 to 30 inches thick)
C2--42 to 60 inches; brown (10YR 5/3) extremely cobbly coarse sandy loam, very pale brown (10YR 7/3) dry; massive; soft, very friable, nonsticky and nonplastic; few roots; many irregular pores; 15 percent stones, 35 percent cobbles, 30 percent gravel; strongly acid (pH 5.3);
TYPE LOCATION: Lake County, Oregon; NE1/4, SE1/4 of section 6, T. 38 S., R. 22 E.
RANGE IN CHARACTERISTICS: The soils are moist in the winter and spring and are dry for 30 to 45 consecutive days after the summer solstice. The mean annual soil temperature is 40 to 43 degrees F. The mean summer soil temperature is 44 to 47 degrees F. The base saturation is 5 to 20 percent. The bulk density is 0.85 to 0.95 grams per cubic centimeter. Depth to bedrock is 60 inches or more. The particle-size control section averages 35 to 60 percent rock fragments. Fragments are mainly rhyolite. It is 2 to 10 percent clay. It is very strongly or strongly acid. The very fine sand fraction contains 50 to 70 percent glass.
The A horizon has value of 2 or 3 when moist and 4 or 5 when dry, and chroma of 2 or 3 when moist and 2 to 4 when dry.
The Bw horizon has value of 3 or 4 when moist and 5 or 6 when dry, and chroma of 3 or 4 when moist and dry. It is coarse sandy loam and sandy loam. Rock fragments range from 35 to 60 percent of which 0 to 10 percent are cobbles and 35 to 50 percent are gravel.
The C horizon has value of 4 or 5 when moist and 6 or 7 when dry, and chroma of 3 or 4 when moist and dry. It is coarse sandy loam. Rock fragments range from 60 to 85 percent of which 20 to 35 percent are cobbles, 5 to 15 percent stones and 30 to 50 percent are gravel.
COMPETING SERIES: These are the Goatrack (T) and Joebaldy (T) series. Goatrack soils have a volcanic ash mantle with a fine earth texture of silt loam and are dry for 15 to 25 consecutive days. Joebaldy soils are dry for 15 to 30 consecutive days, have a volcanic ash mantle with a fine earth texture of loam or silt loam and have fragmental material at 20 to 40 inches.
GEOGRAPHIC SETTING: Longjohn soils are on mountainsides at elevations of 6,800 to 8,400 feet. Slopes are 15 to 50 percent. The soils formed in colluvium and residuum primarily from rhyolite. The climate is cold and moist in winters and cool and dry in summers. The mean annual precipitation is 30 to 34 inches. The mean annual temperature is 39 to 41 degrees F. The frost-free period is 20 to 50 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Chocktoot, Drakespeak, Hallihan, Kittleson, and Twelvemile soils. Chocktoot soils have mollic epipedons. Drakespeak soils are loamy-skeletal. Hallihan soils have a xeric soil moisture regime. Kittleson soils are ashy. Twelvemile soils have a frigid soil temperature regime.
DRAINAGE AND PERMEABILITY: Somewhat excessively drained; moderately rapid permeability.
USE AND VEGETATION: The soils are forested and are used for watershed, wildlife habitat and recreation. Vegetation is lodgepole pine, whitebark pine, western whitepine, white fir, wheeler bluegrass and longstolon sedge.
DISTRIBUTION AND EXTENT: South central Oregon, MLRA 21. The series is of small extent.
MLRA OFFICE RESPONSIBLE: Reno, Nevada
SERIES ESTABLISHED: Lake County; Oregon; Southern Part; 1991.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Umbric epipedon - 0 to 13 inches (A1, A2 and A3 horizons)
Cambic horizon - 13 to 24 inches (Bw horizon)
Classification into Andisols is based on glass count data from the associated Twelvemile series. Phosphorous retention is assumed to be greater than 25 percent and the Al-Ox plus Fe-Ox is assumed to be greater than 0.4 percent.
The 15 bar water on air dried samples is 4 to 8 percent for the profile.
ADDITIONAL DATA: NSSL data for four horizons (A2, A3, Bw, C1), S87OR-037-005; Forest Service vegetative site CL-C1-12.