Wetland Classification and Mapping of Seward, Alaska

Mike Gracz

Doug Van Patten

Soil Subgroup Descriptions


 

TYPIC CRYAQUENTS, by Douglas J Van Patten

 


 

SIMILAR SOILS: Aquic Cryorthents[1]

 

Depth class: very deep
Drainage class: poorly or very poorly
Parent material: alluvium, colluvium, tidal deposits, glacial till
Landform: alluvial fans, floodplains, discharge slopes, tidal flats, depressions on glacial moraines,
Slopes: 0 to 3 percent
Mean annual precipitation: 68 inches
Mean annual temperature: 40 degrees F

 

TAXONOMIC CLASS: Coarse-loamy, mixed, Typic Cryaquents

TYPICAL PEDON: Typic Cryaquents - on a 1 percent slope under alder/horsetail at 50 feet elevation (All colors are for moist soil)

A--0 to 2 inches; very dark gray (5Y 3/1) silt loam; weak very fine granular structure; very friable, nonsticky, nonplastic; many roots; abrupt smooth boundary.

C1--2 to 4 inches; black (10Y 2.5/1) fine sandy loam; weak very fine granular structure; friable, nonsticky, nonplastic ; common roots; abrupt smooth boundary.

C24 to 25 inches; very dark gray (N 3/ ) stratified silt loam and loamy fine sand; weak very thin platy structure; friable, nonsticky, nonplastic; 10 percent reddish brown (7.5YR 4/4) redoximorphic concentrations in root channels, 20 percent dark gray (5Y 4/1) redoximorphic depletions in matrix; few roots; gradual wavy boundary.

C3--25 to 50 inches; black (N 2.5/ ) stratified loamy sand and silt loam.

 

 

LOCATION: (PEDON 335) About 1 1/2 miles ENE of Seward, Alaska; in the NE1/4 of the SE1/4 of the NE1/4, Sec. 35, T.1 N., R.1 W., Seward Meridian; UTM north 6668898 and UTM east 367226, zone 6

 

REMARKS: Diagnostic features and horizons in this profile include:

  • Redoximorphic features from 4 to 25 inches. (C2 horizon)

  • Aquic moisture regime

WETLAND INDICATORS:

N= 34

Depth to water table: 32 cm

Depth to redox: 8 cm

Organic layer thickness: 4 cm

Indicator: 2B3



[1] Aquic Cryorthents have aquic conditions within 20 inches of the mineral surface for some time in normal years but are not as wet as Typic Cryaquents

WETLAND INDICATORS:

NOT A WETLAND

N= 1

Depth to water table: 107 cm

Depth to redox: 74 cm

Organic layer thickness: 23 cm

Indicator: N/A

 

 


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Contact: Mike Gracz
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907-235-2218

23 January 2007 10:43