LOCATION LUNDGREN OREstablished Series
TAXONOMIC CLASS: Ashy, glassy, frigid Humic Vitrixerands
TYPICAL PEDON: Lundgren ashy sandy loam - woodland, on a 2 percent slope at 3300 feet elevation. (When described (5/86), the soil was dry throughout. Colors are for moist soil unless otherwise noted.)
A1--0 to 5 inches; very dark brown (10YR 2/2) ashy sandy loam, grayish brown (10YR 5/2) dry; weak fine granular structure; slightly hard, friable, nonsticky and nonplastic; many very fine and fine roots; many very fine and fine irregular pores; neutral (pH 6.8); clear smooth boundary.
A2--5 to 14 inches; very dark grayish brown (10YR 3/2) ashy sandy loam, brown (10YR 5/3) dry; weak fine and medium subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; common very fine and fine roots; common very fine and fine irregular pores; 10 percent gravel; neutral (pH 7.0); clear smooth boundary. (Combined thickness of the A horizon is 10 to 20 inches)
Bw--14 to 23 inches; dark brown (10YR 3/3) gravelly ashy sandy loam, yellowish brown (10YR 5/4) dry; moderate fine and medium subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; common very fine and fine roots; common very fine and fine irregular pores; 20 percent gravel; neutral (pH 7.0); abrupt wavy boundary. (6 to 20 inches thick)
2C1--23 to 38 inches; brown (10YR 4/3) very gravelly ashy loam, pale brown (10YR 6/3) dry; massive; slightly hard, friable, nonsticky and nonplastic; few very fine and fine roots; few very fine and fine irregular pores; 45 percent gravel and 5 percent cobbles; neutral (pH 7.2); gradual wavy boundary. (4 to 20 inches thick)
2C2--38 to 60 inches; brown (10YR 4/3) extremely gravelly ashy sandy loam, pale brown (10YR 6/3) dry; massive; slightly hard, friable, nonsticky and nonplastic; few very fine roots; few very fine irregular pores; 50 percent gravel and 15 percent cobbles; neutral (pH 7.2).
TYPE LOCATION: Deschutes County, Oregon; 1,800 feet east and 1,000 feet south of the northwest corner of section 36, T. 15 S., R. 10 E. (Latitude 44 degrees, 13 minutes, 45 seconds N, Longitude 121 degrees, 29 minutes, 8 seconds W)
RANGE IN CHARACTERISTICS: These soils are intermittently moist and are dry in all parts of the soil moisture control section for 90 to 110 consecutive days. The mean annual soil temperature is about 44 to 47 degrees F. Depth to the glacial outwash material is 20 to 40 inches. Depth to bedrock is greater than 60 inches. The mollic epipedon is 10 to 20 inches thick. Base saturation by ammonium acetate is 85 to 100 percent throughout the profile. The particle size control section contains 50 to 80 percent volcanic glass and glass-coated aggregate in the very fine sand fraction. Phosphate retention is 40 to 70 percent. The acid oxalate extractable aluminum plus one-half the acid oxalate extractable iron is 0.4 to 1.0 percent. The 15-bar water on both dried and undried samples is 7 to 12 percent. The particle-size control section averages 20 to 35 percent coarse fragments with the solum containing 0 to 30 percent gravel and the substratum containing 40 to 65 percent gravel and cobbles. The pumice sand content (.5 mm to 2 mm) of the solum ranges from 20 to 60 percent. Reaction is neutral throughout. Field estimated clay content of the solum is 5 to 15 percent.
The A horizon has value of 2 or 3 moist, 4 or 5 dry and chroma of 2 or 3 moist and dry. It is 0 to 10 percent gravel.
The Bw horizon has value of 3 or 4 moist, 5 or 6 dry and chroma of 3 or 4 moist and dry. It contains 20 to 30 percent gravel.
The 2C horizon has value of 3 or 4 moist, 5 or 6 dry and chroma of 3 or 4 moist and dry. It is very gravelly ashy loam, very gravelly ashy sandy loam or extremely gravelly ashy sandy loam with 35 to 60 percent gravel and 5 to 15 percent cobbles. Total rock fragments range from 40 to 65 percent.
COMPETING SERIES: These are the Ermabell, Laidlaw, and Wanoga Series. Laidlaw soils contain less than 5 percent gravel throughout the solum and have 5 to 30 hard firm silica nodules. Wanoga soils are 20 to 40 inches deep to bedrock. Ermabell soils are on stream terraces, have an ash mantle consisting of fine sand or loamy fine sand and a substratum at a depth of 40 inches or more which is very gravelly or extremely gravelly sand.
GEOGRAPHIC SETTING: Lundgren soils are on nearly level outwash plains. Elevation is 2,800 to 4,000 feet. Slopes are 0 to 3 percent. The soils formed in volcanic ash over glacial outwash deposits. The climate is characterized by cold, wet winters and hot, dry summers. The mean annual precipitation is 12 to 18 inches, falling mostly as snow. The mean annual temperature is 40 to 47 degrees F. The frost-free period is 60 to 90 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Fremkle, Fryrear, Henkle, and the competing Wanoga soils. All of these soils are on adjacent uplands and have bedrock within 40 inches of the surface.
DRAINAGE AND PERMEABILITY: Well drained; moderately rapid permeability.
USE AND VEGETATION: These soils are used for timber production and livestock grazing. Potential native vegetation is ponderosa pine, antelope bitterbrush, and Idaho fescue.
DISTRIBUTION AND EXTENT: Deschutes Basin of central Oregon; MLRA 6. The series is not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Deschutes County (Upper Deschutes River Area), Oregon, 1992.
REMARKS: Diagnostic horizons and features in this pedon are:
mollic epipedon - from the soil surface to 14 inches (A1, A2, horizons). The base saturation is 97 percent and organic carbon is 0.6 percent.
cambic horizon - from 14 to 23 inches (Bw horizon). This horizon has mollic colors but lacks the organic matter content definitive of a mollic epipedon.
The upper part of the soil (solum) is an ash deposit from Mt. Mazama
andic soil properties - for the zone from 0 to 60 inches. P-retention is about 60 percent. The amount of glass and glass coated aggregate in the very fine sand fraction is 60 to 74 percent. Acid oxalate aluminum plus one-half the iron is 0.57 to 0.67 percent. The 15-bar water content on both dried and undried samples is 7 to 11 percent.
ADDITIONAL DATA: Partial laboratory data is available for this soil. Reference sample S86OR-017-004 from Deschutes County, Oregon, NSSL, Lincoln, NE, 6/87