LOCATION NONVALNUK               AK

Established Series
MPS/SAS
05/2022

NONVALNUK SERIES

Landscape--valley
Landform--terrace
Microfeature--swale
Slope--0 to 5 percent
Parent material--mossy organic material over loess or alluvium
Mean annual precipitation--about 490 mm
Mean annual air temperature--about -3 degrees C
Depth class--very deep
Drainage class--very poorly drained
Soil moisture regime--peraquic
Soil temperature regime--cryic
Soil moisture subclass--typic

TAXONOMIC CLASS: Loamy, mixed, euic Terric Cryosaprists

TYPICAL PEDON: Nonvalnuk muck on linear, linear swale on a terrace on a slope of 0 percent at an elevation of 121 m (The soil was wet, satiated, from 0 to 100 cm and wet from 100 to 150 cm when described on June 12, 2019.)

Oa--0 to 100 cm; muck, dark gray (10YR 4/1) dry, black (10YR 2/1) moist; many very fine and medium, and common fine and coarse roots; moderately acid (pH 5.7); abrupt smooth boundary

Bw--100 to 110 cm; silt loam, gray (7.5YR 5/1) dry, very dark gray (7.5YR 3/1) moist; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky, nonplastic; nonsmeary; slightly acid (pH 6.3); abrupt smooth boundary

C--110 to 150 cm; silt loam, gray (5Y 5/1) dry, very dark gray (5Y 3/1) moist; massive; slightly hard, friable, slightly sticky, nonplastic; nonsmeary; slightly acid (pH 6.1)

TYPE LOCATION: Yukon-Koyukuk Census Area County, Alaska, latitude 63.1762270 longitude -160.7374440 degrees, datum WGS84 (Coordinates determined with a GPS unit)

RANGE IN CHARACTERISTICS:
Mean annual soil temperature--0 to 3 degrees C
Soil moisture control section--saturated at the soil surface during much of the growing season (peraquic soil moisture regime)
Aquic conditions--present throughout the profile
Thickness of sapric soil materials--75 to 120 cm
Total thickness of organic layers--greater than 100 cm

Oa horizon
Value--2 or 3 moist, 4 to 5 dry
Chroma--1 or 2 moist
Reaction--5.3 to 6.2
Organic matter content--85 to 95 percent
Rubbed fiber content--0 to 17 percent
Thickness--75 to 120 cm

Bw horizon
Hue--7.5YR or 10YR
Value--3 or 4 moist, 5 or 6 dry
Chroma--1 to 3
Fine-earth texture--silt loam, sandy loam
Clay--5 to 16 percent
Sand--10 to 70 percent
Organic carbon--1 to 3 percent
Reaction--5.7 to 6.6
Thickness--5 to 15 cm

C horizon
Value--3 or 4 moist, 5 or 6 dry
Chroma--1 or 2
Fine-earth texture--silt, silt loam
Clay--3 to 18 percent
Sand--5 to 20 percent
Organic carbon--1 to 3 percent
Reaction--5.7 to 6.7
Thickness--20 to 40 cm

COMPETING SERIES: None

GEOGRAPHIC SETTING:
*Elevation--80 to 400 m
*Climate--warm, moist summers; cold, dry winters
*Mean annual precipitation--455 to 570 mm
*Mean annual air temperature-- -5 to -1 degrees C
*Frost-free period--55 to 90 days

GEOGRAPHICALLY ASSOCIATED SOILS:
* Sprucecreek--folistic epipedon, sandy particle-size class, well drained, terraces in valleys
* Cilla--ochric epipedon, cambic horizon present, aquic conditions below 50 cm; footslopes on hills
* Jessecreek--gelic soil temperature regime gravels present, textures range to loamy sand; similar landscape position

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
*Drainage class--very poorly drained
*Saturation during normal years--saturated throughout the profile during the growing season
*Flooding--rare, brief
*Ponding--frequent, long
*Saturated hydraulic conductivity (Ksat)--high in the organic soil horizons, moderately high in the mineral soil horizons

USE AND VEGETATION:
Use--wildlife habitat, recreation, subsistence
Potential native vegetation--resin birch, dwarf birch, Alaska bog willow, purple marsh locks, horsetail, water sedge, sphagnum, bog rosemary looseflower alpine sedge, white spruce, mud sedge, silvery sedge, Graminoid, water horsetail, Barclay's willow, small cranberry, abietinella moss, tussock cottongrass, angled paludella moss, calliergon moss, Moss

DISTRIBUTION AND EXTENT: Yukon-Kuskokwim Highlands, Alaska; MLRA 230; small extent

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

SERIES ESTABLISHED: Nulato Hills BLM area, Yukon-Koyukuk Census Area, Alaska; 2021

REMARKS:
Diagnostic horizons and features recognized in this pedon
*Surface tier--zone from 0 to 30 cm
*Subsurface tier--zone from 30 to 90 cm
*Bottom tier--zone from 90 to 130 cm
*Thickness of organic layers--100 cm
*Aquic conditions--present throughout the profile
*Sapric soil materials--zone from 0 to 100 cm

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National Cooperative Soil Survey
U.S.A.