LOCATION FISHNET                 AK

Established Series
JDP/TJR
05/2022

FISHNET SERIES

Landscape--alluvial plains
Landform--low energy flood plains
Slope--0 to 3 percent
Parent material--organic material over alluvium
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--cryic
Soil moisture subclass--typic

TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, nonacid Histic Cryaquepts

TYPICAL PEDON: Fishnet peat on a boreal flood plain with a slope of 1 percent and an elevation of 100 m (The soil was moist throughout when described on September 1, 2015.)

Oi--0 to 14 cm; peat; many very fine roots, common fine roots; neutral (pH 6.8); clear wavy boundary

Oe/Oa--14 to 26 cm; stratified mucky peat and muck; 50 percent very dark brown (10YR 2/2) moist and 50 percent black (10YR 2/1) moist; common very fine and fine roots; neutral (pH 7.3); abrupt wavy boundary

Cg1--26 to 54 cm; very fine sandy loam; grayish brown (10YR 5/2) dry, very dark grayish brown (10YR 3/2) moist; massive; slightly hard, friable, slightly sticky and slightly plastic; common very fine roots; few fine and medium pores; 10 percent brown (7.5YR 4/4) moist, masses of oxidized iron in matrix and 20 percent dark gray (2.5Y 4/1) moist, iron depletions in matrix; noneffervescent; slightly alkaline (pH 7.8); clear smooth boundary

Cg2--54 to 150 cm; very fine sandy loam; grayish brown (2.5Y 5/2) dry, very dark grayish brown (2.5Y 3/2) moist; massive; slightly hard, friable; few fine pores; 2 percent brown (7.5YR 4/4) moist, masses of oxidized iron in matrix and 2 percent dark gray (2.5Y 4/1) moist, iron depletions in matrix; noneffervescent; slightly alkaline (pH 7.6)

TYPE LOCATION: Yukon-Koyukuk Census Area, Alaska; latitude 66.2150500 degrees, longitude -149.0394000 degrees, datum WGS84 (coordinates determined with a GPS)

RANGE IN CHARACTERISTICS:
Mean annual soil temperature--0.5 to 2.5 degrees C
Depth to redoximorphic features--25 to 50 cm

Oi, Oe, and Oa horizons
Combined thickness--20 to 35 cm
Reaction--6 to 8

Cg1 and Cg2 horizons
Hue--10YR, 2.5Y
Value--2 to 4 moist, 4 to 6 dry
Chroma--1 or 2 moist
Fine-earth texture--silt loam, very fine sandy loam
Clay content--0 to 18 percent
Reaction--6 to 8
Effervescence--none to slight
Combined thickness--115 to 130 cm

COMPETING SERIES:
Tanjoga--occasional flooding; adjacent terraces
Disappear--these soils are very strongly acid to strongly acid in the solum
Liscum--these soils have a water table higher than 50 cm in summer months

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:
Tanjoga--aquic conditions within 25 cm; adjacent terraces of low energy floodplains; scrub vegetation
Nuntragut--aquic conditions within 100 cm; adjacent terraces; forested
Jokinaugh--aquic conditions within 25 cm; depressions on adjacent distal floodplains; grassland vegetation

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--poorly drained
Saturation in normal years--water table top depth between a depth of 0 to 25 cm in May and June; saturated below a depth of 50 cm throughout the rest of the year
Flooding--frequent, long
Ponding--none
Saturated hydraulic conductivity (Ksat)--high throughout

USE AND VEGETATION:
Use--wildlife habitat, subsistence, recreation
Potential natural vegetation--Bluejoint, water sedge, field horsetail, bog yellowcress

DISTRIBUTION AND EXTENT: Yukon Flats Lowlands, Alaska; MLRA 232; small 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 51 to 126 cm
*Histic epipedon-Oi, Oe, and Oa horizons
*Redoximorphic iron concentrations--Cg1 and Cg2 horizons
*Redoximorphic iron depletions with chroma of 2 or less--Cg1 and Cg2 horizons
*Reduced matrix--Cg1 and Cg2 horizons
*Aquic conditions--Cg1 and Cg2 horizons

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National Cooperative Soil Survey
U.S.A.