Wetland Classification and Mapping of Seward, Alaska

 

 

Map Unit Descriptions

 

Ecosystem: Kettle

 

Map Units: K2-4; K1-4

 

Seward Area Extent: 

K2-4: 4 wetland polygons; 8.9 acres

K1-4: 1 wetland polygon; 1.1 acres

A K2-4 peatland on the large rock drumlin northeast of Seward.  The skunk cabbage in this wetland represents the K2 component.  Bluejoint reedgrass is K3, and the mountain hemlock is K4.

Wetland Indicators

Type: Peatland with small pond

Average depth to water table: 13 cm

Organic layer thickness: 99 cm

Average depth to redoximorphic features: n/a

Common Soils: Terric Cryosaprists, Typic Cryosaprists, Typic Cryohemists

Common Plant communities:

K2:

Fewflower sedge - tall cottongrass (Carex pauciflora - Eriophorum angustifolium)

Tufted bulrush - tall cottongrass (Tricophorum caespitosum - Eriophorum angustifolium)

 

K3:

Bluejoint reedgrass (Calamagrostis canadensis)

Fewflower sedge - dwarf birch (Carex pauciflora - Betula nana)

 

NWI: L1UB1 or PEM2H if shallow (K1); PEM1Bg (K2); PSS1,3&4Bg (K3); PFO4B (K4)

HGM: Terrene Basin groundwater-dominated Throughflow (headwater)

These uncommon peatlands have a sedge-dominated and shrubby component (K2 and K3 respectively) at the center of a wet forest (K4).  They are typically linear, and are often where a first-order stream emerges, only to disappear into the next wetland downstream.  These wetlands are found in linear low-lying areas on ice-scoured bedrock knobs and benches, along eroded bedding planes.

Kettle Ecosystem wetlands are hydrologically connected at or near the surface to streams and eventually Resurrection Bay.  Seward area Kettles are primarily encountered on the large rock drumlin northeast of town.  They also occur in low spots on other ice-scoured bedrock knobs, especially above the South Fork of the Snow River.

 


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

12 February 2007 15:21