LOCATION SUSSAYMIN               AK

Established Series
JDP/TJR
02/2022

SUSSAYMIN SERIES

Landscape--alluvial plains
Landform--bogs on stream terraces
Slope--0 to 1 percent
Parent material--mossy organic material
Mean annual precipitation--about 255 mm
Mean annual air temperature--about -6 degrees C
Depth class--very deep
Drainage class--poorly drained
Soil moisture regime--aquic
Soil temperature regime--gelic
Soil moisture subclass--typic

TAXONOMIC CLASS: Dysic, subgelic Typic Hemistels

TYPICAL PEDON: Sussaymin mucky peat on a woodland terrace with a slope of 0 percent and an elevation of 105 m (The soil was wet throughout when described on August 25, 2015.)

Oe1--0 to 15 cm; mucky peat; many very fine roots, common fine and medium roots; extremely acid (pH 4.0); abrupt wavy boundary

Oa1/Oe2--15 to 34 cm; mucky peat and muck; common very fine and fine roots; extremely acid (pH 3.8); clear wavy boundary

Oa2--34 to 60 cm; muck; extremely acid (pH 3.5); clear wavy boundary

Oef--60 to 100 cm; permanently frozen mucky peat; very firm; extremely acid (pH 4.3)

TYPE LOCATION: Yukon-Koyukuk Census Area, Alaska; latitude 66.1765160 degrees, longitude -149.4911620 degrees, datum WGS84 (coordinates determined with a GPS)

RANGE IN CHARACTERISTICS:
Mean annual soil temperature-- -4 to 1 degrees C
Depth to permafrost--40 to 80 cm
Other features--organic materials are derived primarily from sphagnum moss

Oe, Oa, Oef, and Oaf horizons
Combined thickness--100 to 150 cm
Reaction--3.0 to 5.0

COMPETING SERIES:
Bonot--shallow and very shallow permafrost; grassy organic material

GEOGRAPHIC SETTING:
Elevation--90 to 300 m
Climate--short, warm summers and long, very cold winters
Mean annual precipitation--210 to 310 mm
Mean annual air temperature-- -12 to 0 degrees C
Frost-free period--45 to 97 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Gushdoiman--aquic conditions within 25 cm with frequent ponding; similar landforms; tussock scrub vegetation
Yanert--aquic conditions within 25 cm with frequent ponding; swales on similar landforms
Twin--aquic conditions within 25 cm with rare flooding; higher positions on similar landforms

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--poorly drained
Saturation in normal years--seasonal perched water table top depth between a depth of 0 to 25 cm in May and June, and between a depth of 25 to 50 cm in July and August
Flooding--none
Ponding--occasional, long
Saturated hydraulic conductivity (Ksat)--high throughout

USE AND VEGETATION:
Use--wildlife habitat, subsistence, recreation
Potential natural vegetation--black spruce, resin birch, marsh Labrador tea, lingonberry, bog rosemary, cottongrass, cloudberry, greygreen reindeer lichen, star reindeer lichen, cup lichen, flavo lichen, Sphagnum moss

DISTRIBUTION AND EXTENT: Yukon Flats Lowlands, Alaska; MLRA 232; moderate extent

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

SERIES ESTABLISHED: Yukon Flats National Wildlife Refuge, Yukon-Koyukuk Census Area, Alaska; 2020

REMARKS:
Diagnostic horizons and other features in this pedon
*Particle-size control section--zone from 0 to 100 cm
*Histic epipedon--zone from 0 to 40 cm
*Permafrost--Oef horizon
*Aquic conditions--zone from 25 to 100 cm
Soils are dominantly derived from sphagnum moss, but may contain sedge materials overlying mineral horizons at greater than 100 cm depth.
Some pedons have mineral horizons that occur below 100 cm.

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National Cooperative Soil Survey
U.S.A.