Wetland Classification and Mapping of Seward, Alaska

Mike Gracz

Doug Van Patten

Soil Subgroup Descriptions


HISTIC CRYAQUEPTS, by Douglas J Van Patten


SIMILAR SOILS: Typic Cryaquods (Histic)[1]

Depth class: very deep
Drainage class: poorly or very poorly drained
Parent material: alluvium, colluvium, or glacial till
Landform: floodplains, alluvial fans, and depressions on till plains
Slopes: 0 to 6 percent
Mean annual precipitation: 68 inches
Mean annual temperature: 40 degrees F

TAXONOMIC CLASS: Coarse-loamy, mixed, Histic Cryaquepts

TYPICAL PEDON:  Histic Cryaquepts - on a 1 percent slope under sedge/alder vegetation at 85 feet elevation. (All colors are for moist soil)

Oi1--0 to 3 inches; brown (7.5YR 4/4) peat; many very fine, fine, and medium roots, common coarse roots; clear wavy boundary.

Cg1--3 to 6 inches; very dark gray (10YR 3/1) mucky silt loam; massive; very friable, nonsticky and nonplastic; many very fine, fine, and medium roots, common coarse roots; abrupt smooth boundary

Oi2--6 to 15 inches; very dark brown (10YR 2/2) peat; many very fine, fine, and medium roots, common coarse roots; thin strata of silty material; gradual smooth boundary.

Cg2--15 to 20 inches; very dark gray (10YR 3/1) stratified mucky silt loam and loamy sand; massive; very friable, nonsticky and nonplastic; common very fine and fine roots; abrupt smooth boundary

LOCATION:  (PEDON 244)  About 2 miles NNE of Seward, Alaska; in the NEĽ of the SW1/4 of the SW1/4, Sec. 23 T.1 N., R 1 W., Seward Meridian;  UTM north 6671465 and UTM east 366030, zone 6

REMARKS:  Diagnostic features and horizons in this profile include:

Histic epipedon:  from 0 to 15 inches. (Oi1 and Oi2 horizons)

Moisture regime:  aquic

WETLAND INDICATORS:

N= 5

Depth to water table: 15 cm

Depth to redox: 0 cm

Organic layer thickness: 28 cm

Indicator: 2A, 3



[1] Typic Cryaquods (Histic) have albic and spodic horizons and a Histic epipedon (latest version of Soil Taxonomy does not have a provision for a Histic subgroup of Cryaquods)

 

WETLAND INDICATORS:

N= 2

Depth to water table: 41 cm

Depth to redox: 3 cm at one site, n/a at the other

Organic layer thickness: 22 cm

Indicator: 2B3

 

 

 

 

 

 

 

 

 

 

 

 

 


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Contact: Mike Gracz
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Homer, AK  99603
907-235-2218

23 January 2007 10:43