LOCATION MAQUINNA                AK

Established Series
IRD. NDP/SCD
05/2022

MAQUINNA SERIES

Landscape--mountains
Landform--mountain slopes
Slope--15 to 70 percent
Parent material--organic material over colluvium over residuum
Mean annual precipitation--about 2600 mm
Mean annual air temperature--about 6 degrees C
Depth class--deep to bedrock
Drainage class--well drained
Soil moisture regime--udic
Soil temperature regime--cryic
Soil moisture subclass--typic

TAXONOMIC CLASS: Coarse-loamy, mixed, superactive Typic Humicryepts

TYPICAL PEDON: Maquinna gravelly silt loam, forested, on a mountain slope of 46 percent at an elevation of 144 m (When described on July 31, 2014, the soil was moist to a depth of 107 cm.)

Oi--0 to 10 cm; slightly decomposed plant material; ultra acid (pH 2.9); clear smooth boundary

Oe--10 to 33 cm; moderately decomposed plant material; ultra acid (pH 3.1); clear smooth boundary

A--33 to 75 cm; gravelly silt loam, light yellowish brown (2.5Y 6/3) dry, olive brown (2.5Y 4/3) moist; weak medium angular blocky structure; slightly hard, friable, slightly sticky and nonplastic; common very fine, fine, medium, coarse, and very coarse roots throughout; common very fine and fine irregular pores ; 27 percent gravel; noneffervescent (HCL, 1N); extremely acid (pH 3.9); clear smooth boundary

C--75 to 107 cm; very gravelly silt loam, very pale brown (10YR 7/3) dry, brown (10YR 5/3) moist; massive; slightly hard, friable, slightly sticky and slightly plastic; common fine, medium, and coarse roots throughout; common very fine and fine irregular pores; 43 percent gravel; noneffervescent (HCL, 1N); strongly acid (pH 5.3); abrupt wavy boundary

2R--107 cm; bedrock

TYPE LOCATION: Glacier Bay National Park and Preserve-Gustavus Area, Alaska; Hoonah-Angoon Census Area, Alaska; latitude 58.4355670, longitude -135.6068660, datum WGS84 (coordinates determined by a GPS unit)

RANGE IN CHARACTERISTICS:
Mean annual soil temperature--1 to 7 degrees C
Soil moisture control section--dry less than 45 consecutive days in June through October (udic)
Thickness of umbric epipedon--25 to 45 cm
Depth to lithic contact--100 to 150 cm

Particle-size control section
*Clay content--5 to 15 percent
*Total rock fragment content--35 to 60 percent

Oi horizon
Thickness--8 to 15 cm

Oe horizon
Thickness--5 to 25

A horizon
Hue--10YR or 2.5Y moist or dry
Value--2 to 4 moist, 4 to 6 dry
Chroma--1 to 3 moist or dry
Clay content--5 to 15 percent
Total rock fragment content--26 to 35 percent gravel
Reaction (pH)--3.6 to 4.5
Base saturation--0 to 20 percent
Thickness--25 to 50 cm

C horizon
Hue--10YR or 2.5Y moist or dry
Value--3 to 5 moist, 5 to 7 dry
Chroma--3 to 6 moist or dry
Clay content--10 to 18 percent
Total rock fragment content--40 to 50 percent gravel
Reaction (pH)--4.6 to 5.3
Thickness--20 to 55 cm

COMPETING SERIES:
Blaquirre--Moderately deep to lithic bedrock

GEOGRAPHIC SETTING:
Elevation--30 to 250 m
Climate--cool, moist summers; mild, wet winters
Mean annual precipitation--1990 to 3250 mm
Mean annual air temperature--3 to 9 degrees C
Frost-free period--90 to 154 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Boussole--25 to 50 cm (somewhat poorly drained) to saturation and aquic conditions; in adjacent mountain valleys
Enigma--free carbonates in upper part; in avalanche chutes of similar landforms
Kutskloh--no lithic contact within a depth of more than 150 cm (very deep); on similar landforms
Wachusett--50 to 100 cm (moderately deep) to a lithic contact; 50 to 100 cm (moderately well drained) to saturation and aquic conditions; on similar landforms

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Depth to saturation in normal years--more than 150 cm year round
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--moderately high in A and C horizons

USE AND VEGETATION:
Use--wildlife habitat, recreation, subsistence
Potential native vegetation--bunchberry dogwood, dicranum moss, splendid feather moss, rusty menziesia, single delight, Sitka spruce, goose neck moss, rough goose neck moss, strawberryleaf raspberry, salmonberry, sphagnum, small twistedstalk, western hemlock, mountain hemlock, dwarf bilberry

DISTRIBUTION AND EXTENT: Alexander Archipelago-Gulf of Alaska Coast, Alaska; MLRA 220; moderate extent

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

SERIES ESTABLISHED: Glacier Bay National Park and Preserve-Gustavus Area, Alaska; 2020.

REMARKS:
Diagnostic horizons and other features recognized in this pedon
*Umbric epipedon--zone from 33 to 75 cm
*Folistic epipedon--zone from the surface to a depth of 33 cm
*Lithologic discontinuity--zone from 75 to 150 cm
*Depth to lithic contact--107 cm
*Particle-size control section--zone from 58 to 107 cm

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National Cooperative Soil Survey
U.S.A.