LOCATION HATISU MP PBEstablished Series
TAXONOMIC CLASS: Ashy, glassy, isohyperthermic Humic Ustivitrands
TYPICAL PEDON: Hatisu silt loam, on a west facing, 83 percent slope in thick sword grass at an elevation of 152 meters (500 feet). Textures are apparent field textures. (Colors are for moist soil unless otherwise noted). When described on May 1, 1999; the soil was moist throughout.
A1--0 to 14 cm (0 to 6 inches); very dark gray (2.5Y 3/1) interior, ashy silt loam; weak fine subangular blocky and weak medium subangular blocky parts to weak fine granular structure; soft, friable, nonsticky, slightly plastic; weakly smeary; many medium roots throughout; many fine and medium high continuity interstitial and tubular pores; slightly acid, pH 6.1 by 1:1 H2O; gradual wavy boundary. (10 to 18 cm thick)
A2--14 to 39 cm (6 to 15 inches); very dark grayish brown (2.5Y 3/2) interior, ashy silt loam; weak fine subangular blocky and weak medium subangular blocky parts to weak fine granular structure; soft, friable, nonsticky, slightly plastic; weakly smeary; many medium roots throughout; many fine and many medium high continuity tubular and interstitial pores; 5 percent medium and coarse platy strongly cemented densic fragments throughout; slightly acid, pH 6.4 by 1:1 H2O; gradual wavy boundary. (20 to 28 cm thick)
Bw1--39 to 57 cm (15 to 22 inches); dark gray (2.5Y 4/1) interior, ashy silt loam; weak fine subangular blocky and weak medium subangular blocky structure; soft, friable, nonsticky, slightly plastic; weakly smeary; common fine and common medium roots throughout; many fine and medium moderate continuity interstitial and tubular pores; 5 percent very angular 2 to 20 mm (0.08 to 0.8 inches) cinder fragments; neutral, pH 7.0 by 1:1 H2O; gradual wavy boundary. (15 to 20 cm thick)
Bw2--57 to 95 cm (22 to 37 inches); dark grayish brown (2.5Y 4/2) interior, gravelly ashy loam; weak fine subangular blocky structure; soft, friable, nonsticky, nonplastic; weakly smeary; common fine and very fine roots throughout; many fine and medium moderate continuity interstitial and tubular pores; 10 percent very angular 2 to 5 mm (.08 to .20 inches) cinder fragments and 15 percent very angular 5 to 20 mm (.20 to .80 inches) cinder fragments; neutral, pH 7.0 by 1:1 H2O; clear wavy boundary. (38 to 44 cm thick)
2C1--94 to 101 cm (37 to 40 inches); lithochromic dark gray (2.5Y 4/1) interior, very gravelly ashy sand; single grain; loose, loose, nonsticky, nonplastic; 20 percent very angular 2 to 5 mm (.08 to 3 inches) cinder fragments and 30 percent 5 to 20 (.20 to .80 inches) cinder fragments; neutral, pH 7.0 by 1:1 H2O; clear smooth boundary. (4 to 11 cm thick)
3C2--101 to 149 cm (40 to 59 inches); 40 percent lithochromic dark gray (10YR 4/1) interior and 60 percent lithochromic very pale brown (10YR 7/3) interior, extremely gravelly ashy sandy loam; weak fine subangular blocky and weak medium subangular blocky structure; friable, soft, nonsticky, nonplastic; 20 percent very angular 2 to 5 mm (.08 to .20 inches) and 50 percent very angular 5 to 75 mm (.20 to 3 inches) cinder fragments; slightly alkaline, pH 7.4 by 1:1 H2O; clear smooth boundary. (41 to 50 cm thick)
4C3--149 to 169 cm (59 to 67 inches); 30 percent lithochromic dark grayish brown (2.5Y 4/2) interior and 70 percent lithochromic light olive brown (2.5Y 5/3) interior, very gravelly ashy coarse sand; single grain; loose, loose, nonsticky, nonplastic; 15 percent very angular 2 to 5 mm (.08 to .20 inches) and 60 percent very angular 5 to 75 mm (.20 to 3 inches) cinder fragments; neutral, pH 7.3 by 1:1 H2O; clear smooth boundary. (19 to 24 cm thick)
5C4--169 to 203 cm (67 to 81 inches); lithochromic grayish brown (2.5Y 5/2) interior, extremely gravelly ashy loam; massive; friable, soft, nonsticky, nonplastic; 15 percent very angular 2 to 5 mm (.08 to .20 inches) cinder fragments and 50 percent very angular 5 to 75 mm (.20 to 3 inches) cinder fragments; slightly alkaline, pH 7.5 by 1:1 H2O. (21 to 31 cm thick)
TYPE LOCATION: Island of Anatahan, Commonwealth of the Northern Mariana Islands, approximately 762 meters (2500 feet) east of Apilam Village on the west side of the island. Lat. 16 degrees, 44 minutes and 31 seconds N., Long. 145 degrees, 38 minutes, and 13 seconds E.; NAD83, Latitude/longitude determined by GPS/PLGR.
RANGE IN CHARACTERISTICS:
The soil moisture control section is moist in some part from July through November and much drier from December through June.
Mean annual soil temperature: 28 degrees C. (83 degrees F).
Depth to lithic contact: Greater than 153 centimeters (60 inches).
Particle-size control section (weighted average):
Rock fragments: 0 to 30 percent gravel cinders and densic fragments in the
upper part, 35 to 80 percent gravel cinders in the lower part
A horizon:
Hue: 10YR or 2.5Y
Value: 2 or 3
Chroma: 1 or 2
Texture: Ashy sandy loam, ashy loam or ashy silt loam
Rock fragments: 0 to 15 percent gravel cinders and densic fragments
Reaction: Moderately acid to neutral
B horizon:
Hue: 10YR or 2.5Y
Value: 4 or 5
Chroma: 2 to 6
Texture: Gravelly ashy sandy loam, gravelly ashy loam, ashy sandy loam,
loam, ashy silt loam
Rock fragments: 0 to 25 percent gravel cinders
Reaction: Neutral
C horizon:
Hue: 10YR to 2.5Y
Value: 3 to 7
Chroma: 2 to 6
Texture: Very gravelly ashy sand, very gravelly ashy sandy loam, and
extremely ashy gravelly loam
Rock fragments: 40 to 80 percent gravel cinders
Reaction: neutral to slightly alkaline
COMPETING SERIES: There are no other soils in this family.
GEOGRAPHIC SETTING:
Parent material: basaltic and andesitic volcanic ash and cinders.
Landform: dissected backslopes and footslopes on mountainsides of stratovolcanic islands
Slopes: 15 to 150 percent
Elevation: 15 to 762 meters (50 to 2,500 feet).
Mean annual temperature: 26 to 30 degrees C (79 to 86 degrees F).
Mean annual precipitation: 1778 to 2286 millimeters (70 to 90 inches).
Precipitation pattern: Monsoonal characterized by a wet season from July through November when moderate to torrential rains occur, and a dry season with substantially less precipitation from December through June.
Frost-free period: 365 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Apilam and the Songsong soils. Apilam soils have a thicker solum, densic horizons in the subsoil and have redoximorphic concentrations. Songsong soils are skeletal throughout the profile.
DRAINAGE AND PERMEABILITY: Well drained, medium or high runoff, and moderate permeability.
USE AND VEGETATION: These soils are used for agroforestry and wildlife habitat. Native and naturalized vegetation includes swordgrass, coconut palms, hibiscus, breadfruit, breadfruit, and fish-kill tree.
DISTRIBUTION AND EXTENT: Northern Mariana Islands. The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES PROPOSED: Island of Anatahan, Commonwealth of the Northern Mariana Islands, 1999
REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Andic properties: From the soil surface to a depth of 95 centimeters.
Cambic horizon: the zone from 39 to 95 centimeters (Bw1 and Bw2).
Mollic epipedon: From the soil surface to a depth of 39 centimeters.
Taxonomic Version: Second edition Soil Taxonomy, 1999
ADDITIONAL DATA: NSSL Lab sample # S99MP-090-015