LOCATION DOROVAN MS+AL FL NC SC VA
Rev. RED; WMK; RBH; GRB
The Dorovan series consists of very deep, very poorly drained, moderately permeable soils on densely forested flood plains, hardwood swamps, and depressions in the Atlantic Coast Flatwoods (153A), Eastern Gulf Coast Flatwoods (152A), and Southern Coastal Plain Major (133A) Land Resource Areas. They formed in highly decomposed acid-organic materials. Near the type location, the mean annual temperature is about 67 degrees F., and the annual precipitation is about 57 inches. Slopes are less than 1 percent.
TAXONOMIC CLASS: Dysic, thermic Typic Haplosaprists
TYPICAL PEDON: Dorovan muck, in a forested area (Colors are for wet soil).
Oi--0 to 3 inches; very dark brown (10YR 2/2) mucky peat consisting of partially decomposed moss, leaves, roots and twigs; about 50 percent fiber rubbed; slightly sticky; extremely acid; gradual wavy boundary. (0 to 4 inches thick)
Oa1--3 to 11 inches; black (10YR 2/1) muck; about 30 percent fiber unrubbed and less than 5 percent rubbed; fibers remaining after rubbing are partially decomposed wood 1 to 2 mm in size; massive; nonsticky; common roots and partially decomposed limbs; extremely acid; diffuse wavy boundary.
Oa2--11 to 74 inches; black (10YR 2/1) muck; about 30 percent fiber unrubbed and less than 5 percent rubbed; fibers remaining after rubbing are partially decomposed wood 1 to 2 mm in size; massive; nonsticky; few roots; decomposed limbs and twigs; few logs; extremely acid; gradual wavy boundary. Combined thickness of the Oa horizon(s) is 51 to 80 inches)
Cg1--74 to 92 inches; very dark grayish brown (10YR 3/2) sand; single grained; loose; few partially decayed small fragments of wood; very strongly acid; gradual wavy boundary.
Cg2--92 to 108 inches; dark grayish brown (10YR 4/2) sand; single grained; loose; few partially decayed small fragments of wood; very strongly acid.
TYPE LOCATION: George County, Mississippi. Approximately 2.5 miles south of junction of State Highways 26 and 63; 0.75 mile east of Highway 63; 150 feet west of old bridge site and 75 feet north of levee in Cedar Creek flood plain; NE1/4 sec. 16 T. 2 S., R. 6 W.
RANGE IN CHARACTERISTICS: The organic material ranges from 51 to more than 80 inches thick. Reaction is extremely acid to very strongly acid in the organic layers and very strongly acid or strongly acid in the mineral layers.
The Oi layer, where present, has hue of 5YR to 10YR, value of 2 to 4, and chroma of 1 to 3; or it is neutral with value of 2 to 4. It contains more than 40 percent fiber rubbed.
The Oe layer, where present, has hue of 5YR to 10YR, value of 2 to 4, and chroma of 1 to 3; or it is neutral with value of 2 to 4. It contains 20 to 40 percent fiber rubbed.
The Oa layers have hue of 5YR to 2.5Y, value of 2 or 3, and chroma of 0 to 3; or it is neutral with value of 2 or 3. They contain 10 to 40 percent fiber unrubbed, less than 1/6 of the volume when rubbed. Fibers remaining after rubbing are dominantly woody. A few logs and large fragments of wood are typically in the lower part of the organic layers.
The Cg horizon has hue of 10YR to 5Y, value of 2 to 5, and chroma of 0 to 2; or it is neutral with value of 2 to 5. Texture is sand, coarse sand, fine sand, loamy sand, sandy loam, fine sandy loam, clay or their mucky analogues.
COMPETING SERIES: The
Pungo series are the only known series in the same family. Dare soils have hue of 2.5YR or 5YR in some part of the profile. Ebro soils have more than 75 percent silt plus clay in the mineral fraction. Pungo soils have parts of the control section that are less decomposed than Dorovan soils.
GEOGRAPHIC SETTING: Dorovan soils are on the flood plains, hardwood swamps, and depressions. They formed in highly decomposed acid-organic materials. The climate is humid subtropical. Slopes range from 0 to 1 percent. The mean annual temperature is about 67 degrees F., and the annual precipitation is about 57 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These include the
Ponzer series. The poorly drained Atmore, somewhat poorly drained Basin and Lenoir and the moderately well drained Harleston soils are on adjacent higher positions and are mineral throughout. Croatan, Pamlico and Ponzer soils have mineral layers at a depth of less than 51 inches. Johnston soils are in similar positions but are mineral throughout.
DRAINAGE AND PERMEABILITY: Very poorly drained; moderate permeability. Runoff is very slow and water is ponded on the surface in depressions.
USE AND VEGETATION: Nearly all of Dorovan soils are used for woodland and wildlife habitat. The native vegetation dominated by blackgum, baldcypress, sweetbay, swamp tupelo, titi, greenbrier, red maple and scattered pine. The ground cover is ferns, mosses, and other hydrophytic plants.
DISTRIBUTION AND EXTENT: Alabama, Florida, Mississippi, North Carolina, and South Carolina. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Auburn, Alabama.
SERIES ESTABLISHED: Escambia County, Alabama; 1969.
REMARKS: Diagnostic horizons and features recognized in this pedon:
Histic epipedon - the zone from the surface to a depth of about 71 inches (Oi, Oa1 and Oa2 horizons).
Dysic - the zone from the surface to a depth of 74 inches (Oi, Oa1 and Oa2 horizons).
Dorovan soils are in MLRAs 133A, 152A and 153A.
ADDITIONAL DATA: Laboratory data is available on the National Soil Survey website at: http://ncsslabdatamart.sc.egov.usda.gov/querypage.aspx
Laboratory data is provided by The University of Florida, Department of Soil and Water Science, Gainesville, FL.
National Cooperative Soil Survey