Wetland Classification and Mapping of Seward, Alaska

Mike Gracz

Doug Van Patten

Soil Subgroup Descriptions


 

FLUVAQUENTIC CRYOFIBRISTS, by Douglas J Van Patten

 


SIMILAR SOILS: Fluvaquentic Cryohemists[1], Fluvaquentic Cryosaprists[2]

Depth class: very deep
Drainage class: very poorly drained
Parent material: peat with thin mineral strata
Landform: fens, floodplains, depressions on till plains
Slopes: range 0 to 1 percent
Mean annual precipitation: 68 inches
Mean annual temperature: 40 degrees F

TAXONOMIC CLASS: Fluvaquentic Cryofibrists

TYPICAL PEDON: Fluvaquentic Cryofibrists - on a 1 percent slope under alder/willow and sedge/bluejoint at 230 feet elevation. (All colors are for moist soil)

Oi1--0 to 2 inches; dark reddish brown (10YR 3/2) peat, contains 75% or more fibers after rubbing; many very fine, fine, and medium roots; abrupt smooth boundary

Cg1--2 to 4 inches; very dark greenish gray (10Y 3/1) silt loam; massive; friable, nonsticky and nonplastic; many very fine, fine, and medium roots; abrupt smooth boundary

Oi2--4 to 7 inches; dark reddish brown (7.5YR 3/4) peat, contains 75% or more fibers after rubbing; many very fine, fine, and medium roots; abrupt smooth boundary

Cg2--7 to 10 inches; very dark greenish gray (10Y 3/1) silt loam; massive; friable, nonsticky and nonplastic; many very fine, fine, and medium roots; abrupt smooth boundary

Oi3--10 to 12 inches; dark reddish brown (7.5YR 3/4) peat, contains 75% or more fibers after rubbing; abrupt smooth boundary

Cg3--12 to 14 inches; very dark greenish gray (10Y 3/1) silt loam; massive; friable, nonsticky and nonplastic; common very fine, fine, and medium roots; abrupt smooth boundary

Oi4--14 to 18 inches; dark reddish brown (7.5YR 4/4) peat, contains 75% or more fibers after rubbing; abrupt smooth boundary

Cg4--18 to 48 inches; very dark greenish gray (10Y 3/1) stratified silt loam and peat; massive; friable, nonsticky and nonplastic; few very fine, fine, and medium roots

LOCATION: (PEDON 243) About 2 miles NE of Seward, Alaska; in the SE of the NE of the SE Sec. 24, T. 1 N., R. 1 W., Seward Meridian; UTM north 6671576, east 369004, zone 6

REMARKS: Diagnostic features and horizons in this profile include:

  • Aquic moisture regime

  • Fibric material from 0 to 48+ inches with thin layers of mineral soil

 

WETLAND INDICATORS:

N= 2

Depth to water table: 23 cm

Depth to Redox: n/a

Organic layer thickness: >160 cm

Indicator: 1, 2B3


[1] Fluvaquentic Cryohemists have Oe horizons that have 17 to 75% fibers after rubbing

WETLAND INDICATORS:

N=1

Depth to water table: 74 cm on 20 June 2006

Depth to Redox: n/a

Organic layer thickness: >130 cm

Indicator: 1

 

 

 

 

[2] Fluvaquentic Cryosaprists have Oa horizons that have less than 17% fibers after rubbing

 

WETLAND INDICATORS:

N= 1

Depth to water table: -3 cm (surface ponding) on 23 June 2006

Depth to Redox: n/a

Organic layer thickness: > 130 cm

Indicator: 1

 

 

 

 

 

 

 

 

 

 

 

 

 


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Contact: Mike Gracz
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3430 Main Street Suite B1
Homer, AK  99603
907-235-2218

23 January 2007 10:31