LOCATION DUBLON FM+PBEstablished Series
TAXONOMIC CLASS: Carbonatic, isohyperthermic Oxyaquic Udipsamments
TYPICAL PEDON: Dublon loamy fine sand - coconut. When described (8/28/80) the water table was at 17 inches. (Colors are for moist soil.)
A1--0 to 9 inches; dark grayish brown (10YR 4/2) loamy fine sand; very pale brown (10YR 8/3) uncoated sand grains; massive; very friable, slightly sticky and slightly plastic; many very fine, fine, and medium roots; many very fine tubular and interstitial pores; violently effervescent; mildly alkaline (pH 7.4 in 1:1 water); clear smooth boundary. (4 to 39 inches thick)
AC--9 to 22 inches; pale brown (10YR 6/3) loamy fine sand with very pale brown (10YR 8/3) uncoated sand grains; massive; very friable, nonsticky and nonplastic; common very fine and fine roots and few medium roots; many very fine interstitial pores and common very fine and fine tubular pores; violently effervescent; slight odor of sulfur; mildly alkaline (pH 7.6 in 1:1 water); clear wavy boundary. (6 to 14 inches thick)
C1--22 to 27 inches; white (2.5Y 8/2) coarse sand; single grain; loose; few very fine, fine, and medium roots; many very fine and fine interstitial pores; violently effervescent; mildly alkaline (pH 7.7 in 1:1 water); abrupt wavy boundary. (4 to 39 inches thick)
C2--27 to 30 inches; light gray (2.5Y 7/2) sand; single grain; loose; few very fine and fine roots; many very fine interstitial pores; violently effervescent; moderately alkaline (pH 8.0 in 1:1 water); abrupt wavy boundary. (0 to 20 inches thick)
IC3--30 to 59 inches; light gray (5Y 7/2) extremely gravelly coarse sand; single grain; loose; few very fine and fine roots; many very fine and fine and few medium interstitial pores; violently effervescent; about 70 percent by volume pebble size coral fragments .1 to 2 inches in diameter; moderately alkaline (pH 8.0 in water).
TYPE LOCATION: Island of Moen, Truk State, Federated States of Micronesia; about 200 feet north of the end of the Moen municipal dump road and 59 feet east; lat. 7 degrees 25 minutes 16.1 seconds N. and long. 151 degrees 50 minutes 42.6 seconds E.
RANGE IN CHARACTERISTICS: The depth to the water table ranges from 15 to 35 inches. The depth to the gravelly part of the substratum ranges from 20 to greater than 59 inches.
The A horizon has moist color of 10YR 3/2, 4/2, or 5/2 or of 2.5Y 4/2. The uncoated sand grains have color of 10YR 8/2, 8/3, or 8/4. The A horizon is loamy fine sand or loamy sand and has 0 to 15 percent coral pebbles.
The AC horizon has moist color of 10YR 6/2, 6/3, or 7/2. It is loamy fine sand, loamy sand, or sand and has 0 to 15 percent coral pebbles. Some pedons do not have the odor of sulfur.
The C horizon has moist color of 2.5Y 6/2, 7/2, or 8/2, of 10YR 8/2 or 8/3; or of 5Y 7/2 or 8/2. It is stratified coarse sand, sand, fine sand, and loamy sand. Some pedons do not have strata of very gravelly or extremely gravelly sand or coarse sand coral pebbles. The gravelly or extremely gravelly strata are 35 to 75 percent .1 inch to 3 inches in diameter. This horizon is mildly alkaline or moderately alkaline.
COMPETING SERIES: This is the Ngedebus series which lacks a water table within 35 inches of the soil surface.
GEOGRAPHIC SETTING: The Dublon soils are on coastal strands. Slopes range from 0 to 2 percent. These soils formed in water and wind deposited coral sand. Elevation ranges from sea level to 6 feet. The mean annual rainfall is about 118 to 143 inches, and the mean annual temperature is about 81 degrees F.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Chia, Dechel, Ilachetomel, Ngerungor and the competing Ngedebus series. The Chia and Ilachetomel soils are organic and are in mangrove swamps. The Dechel soils are very poorly drained, fine textured and formed in alluvium. The Ngerungor soils are very poorly drained and are organic.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained; slow runoff; rapid permeability. A fluctuating water table ranges in depth from 15 to 35 inches.
USE AND VEGETATION: These soils are used mainly for growing coconut for copra production. Some areas are used for homesites and recreation.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
DISTRIBUTION AND EXTENT: Coastal areas of the islands of Truk and Yap, Caroline Islands. The series is of small extent.
SERIES ESTABLISHED: Moen, Truk, Federated States of Micronesia, 1981.