Wetland Classification and Mapping of Seward, Alaska

 

 

Map Unit Descriptions

 

Ecosystem: Headwater Fen

 

Map Units: H1-3; H31

 

Seward Area Extent: 

H1-3: 2 wetland polygons; 1.7 acres

H31: 1 wetland polygon; 0.4 acres

H1-3 includes the small pond (H1), low-lying sedge-dominated areas with a water table very near the surface, and fewflower sedge-dominated areas, which typically occupy areas with a deeper water table.

 

Wetland Indicators

Type: Peat

Average depth to water table: 10 cm

Organic layer thickness: 146 cm

Average depth to redoximorphic features: n/a

Common Soils: Typic Cryohemists, Typic Cryosaprists, Terric Cryosaprists

Common Plant communities:

H1:

Water horsetail (Equisetum fluviatle)

H2:

Sphagnum - Tall cottongrass (Eriophorum angustifolium)

H3:

Fewflower sedge (Carex pauciflora)

 

NWI: L2UB1 (H1); PEM1Bg (H2); PSS1,3&4Eg (H3)

HGM: Terrene Basin groundwater-dominated Throughflow headwater.

H1 is the Headwater Fen Ecosystem wetland component with open surface water.  Near Seward, H3 is almost always indicated by a thick cover of fewflower sedge (Carex pauciflora).  Some small ponds amidst a field of fewflower sedge occurs at the one wetland, named H31, on the glacier-cut bedrock bench above Fourth of July Creek.  Low-lying wetter areas occupied by tall cottongrass (H2) occur along with ponds in a field of fewflower sedge at two other wetlands, named H1-3, on that bench.

Headwater Fen Ecosystem wetlands are peatlands at or near the headwaters of first-order streams.  Seward area Headwater Fens are mapped only on the 800' elevation glacier-cut bedrock bench above Fourth of July Creek.

 


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 Introduction and Key to Plant Communities  

Introduction and Key to Ecosystems

   Seward Soils    Map Unit Summary    Methods    Glossary

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Contact: Mike Gracz
Kenai Watershed Forum 
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Old Town Professional Center
3430 Main Street Suite B1
Homer, AK  99603
907-235-2218

12 February 2007 15:16