LOCATION MOYINA ORTentative Series
TAXONOMIC CLASS: Coarse-silty, mixed, superactive, nonacid Humic Cryaquepts
TYPICAL PEDON: Moyina mucky silt, marsh. (Colors are for moist soil unless otherwise noted.)
A1--0 to 2 inches; black (10YR 2/1) mucky silt, very dark gray (10YR 3/1) dry; weak thin platy structure; slightly hard, friable, nonsticky and nonplastic; many very fine roots; many very fine pores; moderately acid (pH 5.6); abrupt wavy boundary. (1 to 3 inches thick)
A2--2 to 11 inches; black (10YR 2/1) mucky silt, very dark gray (10YR 3/1) dry; weak thick platy structure; slightly hard, friable, nonsticky and nonplastic; many very fine roots; many very fine pores; moderately acid (pH 5.6); clear smooth boundary. (8 to 12 inches thick)
A3--11 to 36 inches; black (10YR 2/1) mucky diatomaceous silt, very dark gray (10YR 3/1) dry; common faint brown (10YR 4/3) variegations; massive; soft, friable, nonsticky and nonplastic; common very fine roots; many very fine pores; color variegations are lenses of peat; moderately acid (pH 5.6); clear smooth boundary. (0 to 25 inches thick)
2Oe--36 to 59 inches; dark grayish brown (10YR 4/2) peat, grayish brown (10YR 5/2) dry; massive; soft, very friable, nonsticky and nonplastic; few very fine roots; many very fine pores; strongly acid (pH 5.3); abrupt smooth boundary. (10 to 30 inches thick)
3C--59 to 63 inches; white (10YR 8/1) very paragravelly ashy coarse sand, single grain; loose; nonsticky and nonplastic; no roots; many very fine pores; 30 percent paragravel pumice and 10 percent paracobble pumice; moderately acid (pH 5.8).
TYPE LOCATION: Klamath County, Oregon; 600 feet east of the northwest corner section 1, T. 30 S., R. 9 E., on the Klamath Marsh.
RANGE IN CHARACTERISTICS: The mean annual soil temperature is 35 to 40 degrees F., the mean summer soil temperature is 40 to 43 degrees F. and the mean winter soil temperature is 32 to 35 degrees F. The soils are wet throughout in most years through spring and early summer with chroma, moist, of 2 or less throughout. Depth to the pumice and ash ranges from 40 to 72 inches. Depth to the organic layer ranges from 20 to 40 inches. The silty upper part of the soil has estimated bulk density of 0.4 to 0.6 gm/cc and is diatomaceous earth. Some pedons have an O horizon up to 4 inches thick.
The A horizon has hue of neutral and 10YR, value of 1 or 2 moist, 3 or 4 dry and chroma of 0 or 1 moist or dry. It is diatomaceous silt or mucky diatomaceous silt. The n value is assumed to be less than 0.7. It has 0 to 5 percent field estimated clay. Base saturation is 20 to 40 percent by ammonium acetate. It has 7 to 24 percent organic matter.
The 2Oe horizon consists of muck, mucky peat or peat. Peat layers have value of 4 and chroma of 2 or 3. Muck layers have value of 1 or 2 and chroma of 0 or 1.
The 3C horizon has phosphate retention of 10 to 25 percent, 0.2 to 0.4 aluminum plus half the iron and 50 to 90 percent glass. Base saturation is less than 50 percent.
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Moyina soils are on marshes in depressional areas of lava plateaus at elevations of 4,515 to 4,525 feet. Slopes are 0 to 1 percent. The soils formed in recent diatomaceous sediments overlying peat and muck. The climate is characterized by cold moist winters with snow and cool dry summers. The mean annual precipitation is 20 to 30 inches. The mean January temperature is 25 to 26 degrees F., the mean July temperature is 57 to 59 degrees F., and the mean annual temperature is 41 to 45 degrees F. The frost-free period is 0 to 50 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Yamsey and Chinchallo soils. Yamsey soils are organic throughout and are on the wettest portions of the marsh adjacent to Moyina soils. Chinchallo soils lack the umbric epipedon (too thin), the organic layer, and have the ashy-pumiceous layer within the particle-size control section.
DRAINAGE AND PERMEABILITY: Very poorly drained; very slow permeability in the upper part and very rapid in the lower part. The soils are ponded in spring and early summer.
USE AND VEGETATION: Moyina soils are used for late summer and fall pasture and wildlife. A few diked and drained areas grow irrigated pasture. Undrained areas have rushes and sedges.
DISTRIBUTION AND EXTENT: Marshes in south-central Oregon; MLRA 6. The soils are moderately extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES PROPOSED: Klamath County, Oregon, 1957.
REMARKS: Diagnostic horizons and other features are:
- Umbric epipedon - from 0 to 36 inches (A1, A2, A3 horizons)
- Particle-size control section - from 10 to 36 inches
- A Thapto-Histic subgroup should be proposed for this series.