LOCATION TRUULI                  AK

Established Series
Rev. DVP/DLM
02/2022

TRUULI SERIES

Depth class: very deep
Drainage class: poorly drained
Parent material: ash influenced loess over loamy till
Landform: hill, depressions on till plains, depressions on terraces
Slopes: 0 to 20 percent
Mean annual precipitation: 20 to 35 inches
Mean annual temperature: 33 to 36 degrees F.

TAXONOMIC CLASS: Medial over loamy, amorphic over mixed, superactive, acid Histic Cryaquands

TYPICAL PEDON: Truuli very fine sandy loam - on a west facing slope of 3 at 575 feet elevation under Lutz spruce, birch, and water tolerant shrubs, and forbs. (All colors are for moist soil)

Oi--0 to 5 inches; very dark grayish brown (10YR 3/2) peat; many very fine and fine roots; extremely acid (pH 4.0); clear smooth boundary

Oa--5 to 11 inches; very dark brown (10YR 2/2) muck and weathered ash; many very fine and fine roots; extremely acid (pH 4.0); clear smooth boundary. (Combined thickness of O horizons 8 to 16 inches thick)

A--11 to 20 inches; very dark grayish brown (10YR 3/2) very fine sandy loam; weak fine granular structure; very friable, nonsticky and nonplastic; many very fine and fine roots; smeary; extremely acid (pH 4.2); abrupt wavy boundary. (4 to 12 inches thick)

2Bg--20 to 26 inches; olive (5Y 4/3) silt loam; moderate fine granular structure; very friable, nonsticky and nonplastic; many fine roots; slightly smeary; 20 percent 6 mm prominent dark yellowish brown (10YR 4/6) redoximorphic concentrations, 5 percent 3mm faint dark grayish brown (2.5Y 4.2) redoximorphic depletions; 5 percent gravel; extremely acid (pH 4.3); clear wavy boundary. (4 to 10 inches thick)

2Cg1--26 to 43 inches; grayish brown (2.5Y 5/2) silt loam; weak fine granular structure; very friable, nonsticky and nonplastic; nonsmeary; 20 percent 6 mm prominent dark yellowish brown (10YR 4/6) redoximorphic concentrations, 50 percent 10 mm faint grayish brown (10YR 5/2) redoximorphic depletions; extremely acid (pH 4.4); clear wavy boundary. (12 to 19 inches thick)

3Cg2--43 to 60 inches; light olive brown (2.5Y 5/3) gravelly sandy loam; weak fine granular structure; very friable, nonsticky and nonplastic; nonsmeary; 20 percent 6 mm prominent dark yellowish brown (10YR 4/6) redoximorphic concentrations, 50 percent 10 mm faint grayish brown (10YR 5/2) redoximorphic depletions; nonsmeary; extremely acid (pH 4.4).

TYPE LOCATION: Western Kenai Peninsula Area, Alaska; about 7 miles southwest of Ninilchik, Alaska; 2,500 feet west and 250 feet north of the SE 1/4, section 32, T. 2 S., R. 13 W.; Seldovia D-5 NE 1:25,000 quad, Seward Meridian; UTM north 6647038 and UTM east 581025, zone 5.

RANGE IN CHARACTERISTICS:

Soil moisture regime: aquic
Depth to loamy material: 18 to 35 inches
Thickness of the histic epipedon: 8 to 16 inches
Thickness of the amorphic material: 14 to 24 inches
Solum thickness: 8 to 18 inches
Depth to redoximorphic concentrations: 14 to 24 inches

O horizon:
Matrix color: hue of 10YR or 2.5Y; value of 2 or 3; chroma of 1 to 3
Texture: muck, mucky peat, peat
Reaction class: extremely acid or very strongly acid

A horizon:
Matrix color: hue of 7.5YR or 10YR; value of 2 or 3; chroma of 2 or 3
Texture: silt loam, very fine sandy loam, mucky silt loam
Reaction class: extremely acid or very strongly acid

2Bg horizon:
Matrix color: hue of 10YR to 5Y; value of 3 or 4; chroma of 3 or 4
Redoximorphic concentrations: hue of 7.5YR or 10YR; value of 3 to 5; chroma of 4 to 6
Reaction class: extremely acid or very strongly acid

2Cg1 horizon:
Matrix color: hue of 10YR or 2.5Y; value of 4 or 5; chroma of 1 or 2
Redoximorphic features: hue of 7.5YR to 2.5Y; value of 4 to 6; chroma of 1 to 6
Texture: sandy loam, silt loam modified by 0 to 20 percent total coarse fragments; 0 to 15 percent gravel, 0 to 5 percent cobbles
Reaction class: extremely acid or very strongly acid

3Cg2 horizon:
Matrix color: hue of 10YR or 2.5Y; value of 4 or 5; chroma of 1 or 2
Redoximorphic features: hue of 7.5YR to 2.5Y; value of 4 to 6; chroma of 1 to 6
Texture: sandy loam, loamy sand modified by 0 to 30 percent total coarse fragments; 0 to 30 percent gravel, 0 to 5 percent cobbles
Reaction class: extremely acid or very strongly acid

COMPETING SERIES: There are no competing series in this classification.

GEOGRAPHIC SETTING:
Depth class: very deep
Drainage class: poorly drained
Parent material: ash influenced loess over loamy till
Landform: hill, depressions on till plains, depressions on terraces
Slopes: 0 to 20 percent
Mean annual temperature: 33 to 36 degrees F.
Mean annual precipitation: 20 to 35 inches

GEOGRAPHICALLY ASSOCIATED SOILS: These include Cohoe and Redoubt soils. Cohoe and Redoubt soils are well drained and occur on hills and till plains.

DRAINAGE AND PERMEABILITY: Well drained, very high runoff. Saturated hydraulic conductivity is high or very high.

USE AND VEGETATION: Used for forestry, wildlife habitat, and recreation. Native vegetation is mixed forest of Lutz spruce and birch, with an understory of watet tolerant shrubs and forbs.

DISTRIBUTION AND EXTENT: MLRA 224 Cook Inlet Lowlands, South-central Alaska. The series is of small extent.

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: WASILLA, ALASKA

SERIES ESTABLISHED: Western Kenai Peninsula, Alaska, 2005

REMARKS: Diagnostic features and horizons recognized in this profile include:
Histic epipedon: from 0 to 11 inches. (Oi and Oa horizons)
Andic soils properties: from 5 to 20 inches. (Oa and A horizons)
Redoximorphic features: from: 20 to 60 inches. (2Bg, @cg1, and 3Cg2 horizons)
Loamy material: 20 to 60 inches
Temperature regime: cryic
Moisture regime: aquic.

ADDITIONAL DATA:

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National Cooperative Soil Survey
U.S.A.