LOCATION PATJENS OR
Tentative Series
DCR
02/2025
PATJENS SERIES
Landscape--High Cascade glaciated mountains
Landform--ice-scoured mountains, cirque headwalls, ice-scoured glacial-valley walls
Slope--2 to 70 percent
Parent material--volcanic ash over till mixed with volcanic ash over basalt or andesite bedrock
Mean annual precipitation--about 2200 mm
Mean annual air temperature--about 4 degrees C
Depth class--moderately deep to lithic contact
Drainage class--well drained
Soil moisture regime--udic
Soil temperature regime--cryic
Soil moisture subclass--typic
TAXONOMIC CLASS: Medial, amorphic Humic Vitricryands
TYPICAL PEDON: Patjens medial fine sandy loam on a forested, 3 percent slope at an elevation of 1354 m
Oi--0 to 2 cm; slightly decomposed plant material; abrupt smooth boundary
Oe--2 to 6 cm; moderately decomposed plant material; abrupt wavy boundary
A--6 to 33 cm; medial fine sandy loam, brown (10YR 5/3) dry, dark brown (10YR 3/3) moist; weak fine subangular blocky structure; soft, very friable, nonsticky, nonplastic; many medium and common very fine, fine, and coarse roots; common very fine dendritic tubular pores; 5 percent gravel; moderately acid (pH 5.7); clear wavy boundary
AB--33 to 46 cm; medial fine sandy loam, brown (10YR 5/3) dry, brown (10YR 4/3) moist; weak medium subangular blocky structure; soft, very friable, nonsticky, nonplastic; common very fine and medium and few fine and coarse roots; common very fine dendritic tubular pores; 5 percent gravel and 5 percent cobbles; moderately acid (pH 6.0); clear wavy boundary
2Bw1--46 to 75 cm; stony medial loam, pale brown (10YR 6/3) dry, brown (10YR 4/3) moist; weak medium subangular blocky structure; soft, very friable, nonsticky, nonplastic; common medium and few very fine roots; common fine and very fine dendritic tubular pores; 5 percent gravel, 2 percent moderately coherent fine pumice paragravel, 10 percent cobbles, and 10 percent stones; slightly acid (pH 6.1); clear smooth boundary
2Bw2--75 to 97 cm; very stony medial loam, light yellowish brown (10YR 6/4) dry, brown (10YR 4/3) moist; weak fine subangular blocky structure; slightly hard, very friable, nonsticky, slightly plastic; few very fine and medium roots; common fine and very fine dendritic tubular pores; 7 percent gravel, 15 percent cobbles, and 20 percent stones; slightly acid (pH 6.2); abrupt smooth boundary
3R--97 cm; indurated andesite
TYPE LOCATION: Lane County, Oregon, 2 km west of Melakwa Lake; 320 m north and 590 m east of the southwest corner of section 2, T. 16 S., R. 7 E.; latitude 44.19988, longitude -121.93309, datum WGS 84 (coordinates determined with a GPS)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--3 to 8 degrees C
Thickness of umbric epipedon--18 to 50 cm
Thickness of andic soil properties--50 to 100 cm
Depth to lithic contact--50 to 100 cm below the mineral soil surface
Hue--10YR, 7.5YR
Reaction--pH 5.6 to 6.5
Estimated properties of layers with andic soil properties
*Ammonium oxalate extractable Al plus 1/2 Fe--2.0 to 4.0 percent
*Particles 0.02- to 2.0-mm diameter--greater than 30 percent of the fine-earth fraction
*Volcanic glass content in 0.02- to 2.0-mm fraction--30 to 60 percent
*Phosphate retention--85 to 100 percent
*15-bar water retention--less than 30 percent (undried samples); 12 to less than 15 percent (dried)
*1/3-bar bulk density--0.6 to 1.1 g/cm3
O horizons
*Composition--slightly to moderately decomposed plant material
*Combined thickness--0 to 10 cm
A and AB horizons
*Value--2 to 4 moist, 4 or 5 dry
*Chroma--2 or 3 moist and dry
*Fine-earth texture--medial fine sandy loam, medial loamy fine sand
*Clay content--2 to 10 percent
*Sand content--55 to 80 percent
*Total fragment content--0 to 15 percent
*Gravel content--0 to 15 percent
*Cobble content--0 to 10 percent
*Thickness--18 to 50 cm
2Bw horizons
*Value--3 or 4 moist, 5 or 6 dry
*Chroma--3 or 4 moist and dry
*Fine-earth texture--medial loam, medial fine sandy loam
*Clay content--8 to 18 percent
*Sand content--40 to 60 percent
*Total fragment content--15 to 50 percent
*Gravel content--5 to 20 percent
*Cobble content--5 to 30 percent
*Stone content--0 to 30 percent
*Pumice paragravel content--0 to 5 percent
*Thickness--25 to 75 cm
COMPETING SERIES:
Polovina--100 to 150 cm to lithic contact
GEOGRAPHIC SETTING:
Elevation--1150 to 2075 m
Climate--cold, wet winters; mild, dry summers
Mean annual precipitation--1800 to 2600 mm
Mean annual air temperature--2 to 7 degrees C
Frost-free period--30 to 105 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Separation--densic contact between 50 and 100 cm; located on glacial-valley floors and lateral moraines
Proxy--frigid soil temperature regime; located on glaciated mountains and lateral moraines
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Saturation in normal years--none within profile
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--high
USE AND VEGETATION:
Use--water supply, recreation, wildlife habitat, timber production
Potential natural vegetation--mountain hemlock, Pacific silver fir, western white pine, Douglas-fir, thinleaf huckleberry, common beargrass, bride's bonnet; commonly supports a mountain hemlock/big huckleberry/beargrass (CMS224) plant association (Field Guide to the Forested Plant Associations of the Westside Central Cascades of Northwest Oregon)
DISTRIBUTION AND EXTENT: High Cascade Mountains, Oregon; MLRA 3; moderate extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana
SERIES PROPOSED: Willamette National Forest, Lane County, Oregon; named for a lake near the type location
REMARKS:
Diagnostic horizons and features in this pedon
*Particle-size control section--zone from 6 to 97 cm
*Umbric epipedon--zone from 6 to 33 cm
*Cambic horizon--zone from 46 to 97 cm
*Depth to lithic contact--97 cm
*Andic soil properties--zone from 6 to 97 cm
*Volcanic glass--zone from 6 to 97 cm
*Lithologic discontinuity--46cm
*Lithologic discontinuity--72cm
09/2023--all mineral horizons meet criteria #3 for andic soil properties in the 13th edition of Keys to Soil Taxonomy. All pedons have third-bar bulk density low enough to also meet criteria #2 (no ash required) throughout the umbric epipedon, and some pedons meet criteria #2 throughout the profile.
Patjens soils occur in terrain scoured by ice sheets. LiDAR hillshade texture is rough, exhibiting many small (10s to 100s of meters long) roche moutonnees or bedrock knobs oriented parallel to the local drainage basin. Patjens soils usually occur up-basin from arcuate recessional moraines and drumlins.
ADDITIONAL DATA: Type location user pedon ID--2022OR039806
National Cooperative Soil Survey
U.S.A.