LOCATION WOCUS ORTentative Series
TAXONOMIC CLASS: Euic Typic Cryohemists
TYPICAL PEDON: Wocus muck - on a 0 percent slope at an elevation of 4,130 feet. (When described on July 21, 2004, the soil was wet throughout and the water table was at 38 inches. The lower part of the profile was described using auger borings due to permanent standing water. Colors are for moist soil unless otherwise noted.)
Oa1--0 to 2 inches; very dark grayish brown (10YR 3/2) rubbed and broken face muck, dark brown (10YR 3/3) dry; 30 percent unrubbed fiber, 10 percent rubbed; weak fine granular structure; soft, friable, nonsticky, slightly plastic; weakly smeary; many very fine and fine roots; many very fine and fine irregular pores; moderately acid, pH 6.0; abrupt smooth boundary.
Oa2--2 to 8 inches; black (7.5YR 2.5/1) rubbed and broken face muck, black (10YR 2/1) dry; 30 percent unrubbed fiber, 10 percent rubbed; weak fine subangular blocky structure; soft, friable, nonsticky, slightly plastic; weakly smeary; common very fine and fine roots; many very fine and fine irregular pores; moderately acid, pH 6.0; abrupt smooth boundary. (The combined thickness of the Oa horizon is 4 to 14 inches)
Oe1--8 to 22 inches; 70 percent brown (7.5YR 4/4) broken face and 30 percent strong brown (7.5YR 4/6) broken face and very dark brown (7.5YR 2.5/2) rubbed mucky peat, dark brown (7.5YR 3/4) dry; 90 percent unrubbed fiber, 60 percent rubbed; weak coarse subangular blocky structure; soft, friable, nonsticky, nonplastic; moderately smeary; common very fine and fine roots; many very fine and fine irregular pores; moderately acid, pH 5.8; clear smooth boundary.
Oe2--22 to 30 inches; yellowish red (5YR 4/6) broken face and black (7.5YR 2.5/1) rubbed mucky peat, dark brown (7.5YR 3/4) dry; 90 percent unrubbed fiber, 60 percent rubbed; weak coarse subangular blocky structure; soft, friable, nonsticky, nonplastic; moderately smeary; many very fine and fine irregular pores; strongly acid, pH 5.5; abrupt smooth boundary.
Oe3--30 to 53 inches; black (7.5YR 2.5/1) broken face and rubbed mucky peat, black (7.5YR 2.5/1) dry; 60 percent unrubbed fiber, 25 percent rubbed; weak coarse subangular blocky structure; soft, friable, nonsticky, nonplastic; weakly smeary; many fine irregular pores; presence of sulfidic materials indicated by strong odor; moderately acid, pH 5.6; abrupt smooth boundary. (The combined thickness of the Oe horizon is 20 to 50 inches)
Oa3--53 to 61 inches; black (2.5Y 2.5/1) rubbed and broken face muck, 80 percent very dark gray (2.5Y 3/1) and 20 percent gray (2.5Y 5/1) dry; 10 percent unrubbed fiber, 0 percent rubbed; massive; slightly hard, friable, slightly sticky, slightly plastic; weakly smeary; many very fine irregular pores; presence of sulfidic materials indicated by strong odor; slightly acid, pH 6.2; clear smooth boundary. (0 to 10 inches thick)
2Ldi--61 to 71 inches; black (N 2/0) rubbed broken face mucky diatomaceous silt loam, gray (2.5Y 5/1) dry; 2 percent unrubbed fiber, 0 percent rubbed; 10 percent clay; massive; hard, friable, slightly sticky, slightly plastic; weakly smeary; common fine irregular pores; presence of sulfidic materials indicated by strong odor; neutral, pH 7.0;
TYPE LOCATION: Klamath County, Oregon; about 6.5 miles west southwest of Chiloquin, Oregon; about 1,040 feet south and 555 feet west of the northeast corner section 5, T.35 S., R.7.5 E (Latitude 42 degrees, 47 minutes, 50 seconds N, Longitude 121 degrees, 41 minutes, 12 seconds E); UTM 580932 meters easting and 4712324 meters northing NAD83 Zone 10.
RANGE IN CHARACTERISTICS:
Average annual soil temperature 38 to 42 degrees F.
Depth to apparent high water table from 18 inches above the surface to 18 inches deep throughout the year, some areas are drained and protected from flooding
Organic material 55 to 75 inches with more than half the volume dominated by hemic materials
Depth to limnic diatomaceous material - 55 to 75 inches
Oa horizon
Fiber content, unrubbed 15 to 32 percent
Fiber content, rubbed 0 to 15 percent
Hue 7.5YR, 10YR, 2.5Y, or Neutral
Reaction strongly acid to slightly acid
Thickness 4 to 14 inches
Oe horizon
Fiber content, unrubbed 35 to 90 percent
Fiber content, rubbed 20 to 50 percent
Hue 5YR, 7.5YR, or 10YR
Value 1 to 4 moist and dry
Chroma - 1 to 6 moist and dry
Thickness 20 to 50 inches
2Ldi horizon
Hue 10YR, 2.5Y, or Neutral
Value 3 to 4 moist and 5 to 8 dry
Chroma 0 to 2 moist and dry
Texture diatomaceous very fine sandy loam, diatomaceous fine sandy loam, or diatomaceous silt loam
Clay content 5 to 27 percent (field estimates)
Diatomaceous content more than 50 percent (field estimates)
Reaction moderately or slightly acid
COMPETING SERIES: These are the Koyuktolik and the Mariel series. Koyuktolik soils are formed in organic material derived from woody plants and are at elevations of 10 to 1,000 feet. Mariel soils have hemic material in the surface tier and are in mountain meadows.
GEOGRAPHIC SETTING: Wocus soils are on floodplains and sag ponds in valleys. Elevation ranges from 4,120 to 4,160 feet. Slopes range from 0 to 1 percent. Wocus soils formed in organic material derived from water tolerant plants over diatomaceous earth. The average annual precipitation is 24 to 32 inches. The climate is characterized by cold, wet winters and cool, moist summers. The average annual temperature is 38 to 42 degrees F. The frost-free period is 5 to 45 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Kirk, Wocusbay, and Yamsay soils. Kirk soils are ashy-pumiceous and are on floodplains. Wocusbay soils have diatomaceous layers in the upper part and are on adjacent alluvial fans and floodplains. Yamsay soils are dominantly sapric material and vegetation is dominated by tules.
DRAINAGE AND PERMEABILITY: Very poorly drained; moderate permeability. These soils are frequently ponded for long periods from January to August. Some areas are drained and protected from flooding.
USE AND VEGETATION: These soils are used for recreation, watershed, and wildlife habitat. The potential natural vegetation is water sedge, beaked sedge, Baltic rush, and spikerush.
DISTRIBUTION AND EXTENT: South-central Oregon, MLRA 6 and 21. The soils are inextensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES PROPOSED: Klamath County, Oregon, 2006
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Organic material the zone from the surface to 61 inches. (The Oa1, Oa2, Oe1, Oe2, Oe3, and Oa3 horizons).
Hemic soil materials the zone from 8 to 53 in. (The Oe1, Oe2, and Oe3 horizons).
Limnic material, diatomaceous earth the zone from 61 to 71 inches. (The 2Ldi horizon).
Aquic conditions- the zone from the surface 80 inches.
Euic reaction class - pH of undried samples from the surface to 71 inches ranges from 5.4 to 6.0.
ADDITIONAL DATA:
NASIS Site ID: 04-SMM-030
NASIS Pedon ID: 04OR681030
Water levels are managed by the US Fish and Wildlife Service in the Klamath Marsh and by the Bureau of Reclamation in Upper Klamath Lake and may vary based on annual management objectives.