LOCATION POLANDER OR
Established Series
Rev. RHB/RWL/CEG
01/2024
POLANDER SERIES
Landform--mountain slopes, hills, dipslopes, scarpslopes
Slope--0 to 70 percent
Parent material--volcanic ash mixed with colluvium and residuum, primarily from pyroclastic rocks
Mean annual precipitation--about 760 mm
Mean annual air temperature--about 7 degrees C
Depth class--very deep and deep to a paralithic contact
Drainage class--well drained
Soil moisture regime--xeric
Soil temperature regime--frigid
Soil moisture subclass--typic
TAXONOMIC CLASS: Ashy, glassy, frigid Typic Vitrixerands
TYPICAL PEDON: Polander ashy sandy loam, in forest on a 41 percent north facing slope at an elevation of about 1715 m
Oi--0 to 3 cm; slightly decomposed ponderosa pine needles.
A--3 to 10 cm; ashy sandy loam, dark grayish brown (10YR 4/2) dry, very dark grayish brown (10YR 3/2) moist; weak very fine granular structure; soft, very friable, nonsticky and nonplastic; common roots; many very fine and fine irregular pores; 10 percent gravel; slightly acid (pH 6.4); abrupt wavy boundary. (5 to 15 cm thick)
AB--10 to 39 cm; ashy sandy loam, grayish brown (10YR 5/2) dry, dark grayish brown (10YR 4/2) moist; weak very fine granular structure; slightly hard, friable, nonsticky and nonplastic; common roots; common very fine and fine irregular pores; 10 percent gravel; slightly acid (pH 6.2); gradual wavy boundary. (20 to 38 cm thick)
Bw--39 to 99 cm; ashy sandy loam, light brownish gray (10YR 6/2) and grayish brown (10YR 5/2) dry, dark grayish brown (10YR 4/2) moist; weak fine subangular blocky structure; hard, friable, slightly sticky and nonplastic; common roots; common very fine and fine irregular pores; 10 percent gravel; moderately acid (pH 6.0); gradual wavy boundary. (51 to 79 cm thick)
C--99 to 130 cm; cobbly ashy loam, light brownish gray (10YR 6/2) dry, dark grayish brown (10YR 4/2) moist; massive; hard, friable, nonsticky and nonplastic; common roots; few very fine tubular pores; 15 percent cobbles, 10 percent gravel; moderately acid (pH 5.8); abrupt wavy boundary. (25 to 41 cm thick)
Cr--130 cm; highly weathered tuffaceous bedrock.
TYPE LOCATION: Lake County, Oregon, about 10 miles north and 5 miles east of the town of Lakeview, OR; SW1/4, NE1/4 of section 28, T. 37 S., R 21 E., Willamette Meridian; Crook Peak, Oregon USGS quadrangle; latitude 42.3331108 degrees north, longitude 120.2465591 degrees west, datum WGS84 (coordinates estimated from PLSS details)
RANGE IN CHARACTERISTICS:
Soil Temperature: frigid regime
Mean annual soil temperature-6 to 8 degrees C
Moisture control section--20 to 60 cm; xeric regime; moist in the winter and spring; dry in all parts for 60 to 100 consecutive days after the summer solstice
Depth to paralithic contact--greater than 100 cm from mineral soil surface
Particle-size control section
*Clay content--10 to 18 percent
*Sand content--55 to 90 percent
*Rock fragment content--0 to 15 percent
*Reaction--moderately to slightly acid (pH 5.6 to 6.5)
Estimated andic properties, from the mineral soil surface to the C horizon:
*Medium to very coarse sand in the .02 to 2.0 mm fraction--less than 50 percent
*Volcanic glass content--50 to 70 percent in the very fine sand fraction
*1/3-bar bulk density--0.85 to 1.10 g/cm3
A horizon
Hue--7.5YR or 10YR moist or dry
Value--2 to 3 moist, 4 or 5 dry
Chroma--2 or 3 moist, 3 or 4 dry
Clay content--10 to 18 percent
Total content of rock fragments--0 to 14 percent
Gravel content--0 to 14 percent
Cobble content--0 to 3 percent
Bw horizon
Hue--7.5YR or 10YR moist or dry
Value--3 or 4 moist, 5 to 7 dry
Chroma--3 or 4 moist or dry
Fine-earth texture-ashy loam, ashy sandy loam, ashy loamy sand
Clay content--10 to 18 percent
Total content of rock fragments--0 to 15 percent
Gravel content--0 to 15 percent
Cobble content--0 to 5 percent
C horizon
Hue--7.5YR or 10YR moist or dry
Value--3 or 4 moist, 5 or 6 dry
Chroma--3 or 4 moist or dry
Fine-earth texture--ashy loam, ashy sandy loam, ashy loamy sand
Clay content--10 to 18 percent
Gravel content--5 to 20 percent
Cobble content--10 to 30 percent
COMPETING SERIES:
Chiwawa--15 to 35 percent pumice pararock fragments in the particle-size control section; lithologic discontinuity with glacial outwash materials between 100 and 150 cm from the mineral soil surface
Mountsun--greater than 50 percent medium to very coarse sand in the .02 to 2.0 mm fraction; contains pumice pararock fragments
Thow--5 to 35 percent pumice pararock fragments in the particle-size control section; lithologic discontinuity with glacial till material between 100 and 200 cm from the mineral soil surface
Vinegar--5 to 35 percent pumice pararock fragments in the particle-size control section
GEOGRAPHIC SETTING:
Elevation--1475 to 2200 m
Climate--cool moist winters, warm dry summers
Mean annual air temperature--4.4 to 7.2 degrees C
Mean annual precipitation--390 to 900 mm
Frost-free period--30 to 80 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Kittleson--cryic soil temperature regime
Rogger--mollic epipedon
Twelvemile--ashy-skeletal
Winterim--mollic epipedon
Woodchopper--mollic epipedon
Mound--mollic epipedon
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Saturated hydraulic conductivity (Ksat)--high
USE AND VEGETATION:
Use--timber production, watershed, wildlife habitat, recreation, and grazing by livestock
Vegetation--white fir, ponderosa pine, common snowberry, heartleaf arnica, Wheeler's bluegrass
DISTRIBUTION AND EXTENT: Klamath and Shasta Valleys and Basins, Oregon; MLRA 21; moderate extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED:
Lake County, Oregon; Southern Part; 1991.
REMARKS:
Diagnostic horizons and features in this pedon
*Ochric epipedon
*Cambic horizon--3 to 39 cm
*Andic soil properties--3 to 99 cm
*Particle-size control section--3 to 103 cm
*Paralithic contact--tuffaceous bedrock at 130 cm
Classification into Andisols is based on laboratory data (glass count and 15 bar water) for the Twelvemile series. Phosphorous retention is assumed to be greater than 25 percent and acid oxalate-extractable aluminum plus one-half of the acid oxalate-extractable iron is assumed to be greater than 0.4 percent.
8/31/2023-This official series description was updated according to SSR01 Technical Note-Content and Format of Official Series Descriptions (revised 11/2017). Most of the changes were in formatting. Also added ashy modifiers and volcanic ash parent materials, added ashy loamy sand textures to the RIC, expanded ranges of elevation, precipitation, and temperature, updated competing series section, and expanded depth class to include very deep soils (see trip report from May 2015 field review from OR683 Soil Survey Area Project)
ADDITIONAL DATA:
Forest Service vegetative site CW-C4-11.
NASIS SITE ID--1991OR037005
NASIS PEDON ID--1991OR037005
National Cooperative Soil Survey
U.S.A.