LOCATION YAMSAY OR
Tentative Series
Rev. JSC/AON/TDT/SMM
05/2011
YAMSAY SERIES
The Yamsay series consists of very deep, very poorly drained soils formed in herbaceous organic material on lake beds, channels, valley floors, sag ponds and depressional areas of lava plateaus. Slopes range from 0 to 1 percent. The mean annual precipitation is about 25 inches/635 millimeters and the mean annual temperature is about 42 degrees F/5.6 degrees C.
TAXONOMIC CLASS: Euic Typic Cryosaprists
TYPICAL PEDON: Yamsay muck, wet marsh, on a slope of less than 1 percent at 4,518 feet/1,377 meters elevation. When described on August 24, 1999, the soil was saturated and had 12 inches (30 cm) of ponded water. (Colors are for moist soils unless otherwise noted.)
Oa1--0 to 20 inches (0.0 to 50 centimeters); black (7.5YR 2.5/1) broken face muck, very dark grayish brown (10YR 3/2), dry; 5 percent unrubbed fiber, 1 percent rubbed; weak medium granular structure; very friable, hard, nonsticky, slightly plastic; many fine roots throughout and few coarse roots throughout; neutral, pH 6.6; gradual smooth boundary. (5 to 8 inches (10 to 20 centimeters) thick)
Oa2--20 to 67 inches (50 to 170 centimeters); very dark brown (10YR 2/2) broken face muck, very dark gray (10YR 3/1), dry; 3 percent unrubbed fiber, 1 percent rubbed; massive; very friable, hard, nonsticky, slightly plastic; few very and fine roots throughout; neutral, pH 6.6; clear smooth boundary. (8 to 59 inches (20 to 150 centimeters) thick)
Oa3--67 to 79 inches (170 to 200 centimeters); dark brown (10YR 3/3) broken face muck, dark grayish brown (10YR 4/2), dry; 1 percent unrubbed fiber, 0 percent rubbed; massive; very friable, hard, nonsticky, slightly plastic; few very fine roots throughout; neutral, pH 6.6. (10 to 39 inches (25 to 100 centimeters) thick)
TYPE LOCATION: Klamath County, Oregon; About 13 miles south and 10 miles east of Chemult; about 446.3 meters north and 148.8 meters east of the southwest corner of section 22, T 29 S, R 9 E; degrees, (Latitude 43 degrees; 2 minutes, 28.06 seconds N., Longitude 121 degrees, 38 minutes, 40.49 seconds W.) Round Butte, Oregon USGS quadrangle; UTM 610405.78 meters E, 4766273.33 meters N, zone 10 NAD83.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature - 40 to 45 degrees F (1.7 to 4.5 degrees C)
Mean summer soil temperature - 43 to 48 degrees F (4.5 to 6 degrees C)
Mean winter soil temperature - 37 to 42 degrees F (0 to 1.6 degrees C)
Depth to high water table - 0 to 36 inches (January to December)
Organic layers - mostly sapric material with more than half of the upper 32 inches having unrubbed fiber content of less than 1/3 the organic volume, or if more the 1/3 the organic volume, the rubbed fiber content is less than 10 percent of the organic volume
Thin lenses of fibric or hemic material - present in some pedons within the control section
Thin diatomaceous or coprogenous earth layers - present in some pedons (1 to 2 inches (2 to 5cm) thick within the control section and 1 to 10 inches (2 to 25 cm) thick in the bottom tier)
Basal layer of pumice paracobbles and paragravel occurs in some pedons below the control section
Reaction: very strongly acid to neutral (pH 4.5 to 7.2)
Oa horizons:
Hue, non-rubbed: 5YR, 7.5YR, 10YR, 2.5Y or N dry or moist
Value, non-rubbed: 2, 2.5, 3 or 4 dry; 2, 2.5 or 3 moist
Chroma, non-rubbed: 0, 1, or 2 dry; 0, 1, 2, or 3 moist
COMPETING SERIES: These are the
Karheen and
Stirfry soils. Karheen soils are on uplifted beaches and are underlain by beach gravel and have very gravelly and extremely gravelly textures below 10 inches. Stirfry soils are in drainageways, formed in mossy organic material and do not have layers of diatomaceous or coprogenous earth in the subsurface tiers.
GEOGRAPHIC SETTING: Yamsay soils occur on slightly concave marshlands on lake beds, valley floors, channels, sag ponds and in depressional areas of lava plateaus. Slopes are 0 to 1 percent. The regolith is very deep and consists of organic layers with thin layers of diatomaceous or copragenous earth overlying pumice flow materials. Elevation is 4,000 to 5,000 feet (1,220 to 1,524 meters). The climate is subhumid with 18 to 30 inches (457 to 762 millimeters) mean annual precipitation. The range in mean annual air temperature is about 40 to 45 degrees F (4.4 to 7.2 degrees C), with a mean January temperature of 25 to 26 degrees F (-3.9 to -3.3 degrees C), and a mean July temperature of 57 to 59 degrees F (13.9 to 15 degrees C). The frost-free period is 10 to 25 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These include the
Moyina,
Chinchallo and
Wocus soils. Moyina soils have diatomaceous earth layers 14 to 40 inches thick over the organic layer. Chinchallo soils have a diatomaceous layer 14 to 40 inches thick over ashy-pumiceous material. Wocus soils are dominantly hemic material, with diatomaceous earth layers below 55 inches.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Very poorly drained. Runoff is very slow. The soils are ponded and have water tables at or near the surface except where drained. Saturated hydraulic conductivity is moderately high to high.
USE AND VEGETATION: Principal native plants include hardstem bulrush, sedges, and marsh grasses.
DISTRIBUTION AND EXTENT: Marshy areas in colder portions of south-central Oregon; MLRA 6. The series is moderately extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES PROPOSED: Klamath County, Oregon, 1955.
REMARKS:
Diagnostic horizons and features recognized in this pedon include:
Histic epipedon - the zone from 0 to 51 inches (0 to 130 centimeters) (Oa1, Oa2, and Oa3 horizons)
Aquic conditions - the zone from 0 to 79 inches (0 to 200 cm)
Particle-size control section for this pedon - the zone from 0 to 51 inches (0 to 130 cm)
ADDITIONAL DATA:
NASIS Pedon ID: 99OR683005
NASIS Site ID: 99-JFD-05
Ecological Site: R006XB016OR Wet marsh 14 to 26 PZ
The type location for this series has been moved and the series reclassified from coprogenous, euic Limnic Cryosaprists. Limnis material is typically not present but when present it is in thin layers.
National Cooperative Soil Survey
U.S.A.