Wetland Classification and Mapping of Seward, Alaska

Mike Gracz

Doug Van Patten

Soil Subgroup Descriptions


TYPIC CRYOSAPRISTS, By Douglas J Van Patten


SIMILAR SOILS: Terric Cryosaprists[1], Typic Cryofibrists[2], Typic Cryohemists[3], Hydric Cryofibrists[4]

Depth class: very deep
Drainage class: poorly or very poorly drained
Parent material: muck over alluvium, colluvium, glacial till
Landform: floodplains, discharge slopes, and depressions on glacial moraines
Slopes: 0 to 10 percent
Mean annual precipitation: 68 inches
Mean annual temperature: 40 degrees F

TAXONOMIC CLASS: Typic Cryosaprists

TYPICAL PEDON: Typic Cryosaprists -- undisturbed (All colors are for moist soil)

Oe--0 to 5 inches; very dark gray (10YR 3/1) mucky peat with decomposing wood fragments; common very fine, fine, and medium roots; slightly acid (pH 6.2); abrupt smooth boundary.

C--5 to 6 inches; very dark grayish brown (10YR 3/2) very fine sandy loam; massive; friable, nonsticky and nonplastic; common very fine and fine roots; slightly acid (pH 6.5); abrupt smooth boundary.

Oa--6 to 60 inches; black (10YR 2/1) and very dark brown (10YR 2/2) muck; common very fine, fine, and medium roots; neutral (pH 7.0).

LOCATION: (PEDON 224) about 2 miles NE of Seward, Alaska; in the SW1/4 of the SW1/4 of the NE1/4 Sec. 24, T.1N., R.1W., Seward Meridian; UTM north 6671967 east 368374, zone 6

 

REMARKS: Diagnostic features and horizons in this profile include:

  • Aquic Moisture regime

  • Sapric material from 6 to 60 inches

 

WETLAND INDICATORS:

N= 6

Depth to water table: 12 cm

Depth to redox: N/A

Organic layer thickness: >130 cm

Indicator: 1, 2B3

 



[1] Terric Cryosaprists are comprised of highly decomposed organic materials that have thickness of 16 to 51 inches above a thick mineral layer

WETLAND INDICATORS:

N= 5

Depth to water table: 10 cm (N=4)

Depth to redox: N/A

Organic layer thickness: 91 cm

Indicator: 1, 2B3

 

 

 

 

 

 

 

 

 

 

 

 

[2] Typic Cryofibrists are comprised of slightly decomposed organic materials to a depth 63 inches or more.

 

WETLAND INDICATORS:

N= 1

Depth to water table:  5 cm on 23 August 2006

Depth to Redox: N/A

Organic layer thickness: >160 cm

Indicator: 1, 2B3

 

 

 

 

 

 

 

 

[3] Typic Cryohemists are comprised of moderately decomposed organic materials to a depth 51 inches or more.

 

WETLAND INDICATORS:

N= 5

Depth to water table: 14 cm

Depth to Redox: N/A

Organic layer thickness: >130 cm

Indicator: 1, 2B3

 

 

 

 

 

 

 

 

 

[4] Hydric Cryofibrists are comprised of slightly decomposed organic materials to a depth 63 inches or more and have a layer of water between depths of 24 to 63 inches.

 

WETLAND INDICATORS:

N= 1

Depth to water table: 5 cm on 20 June 2006

Depth to Redox: N/A

Organic layer thickness: >140 cm

Indicator: 1, 2B3

 

 

 

 

 


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Contact: Mike Gracz
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907-235-2218

23 January 2007 10:46