Wetland Classification and Mapping
of Seward, Alaska
An extension of wetland classification and mapping of the Kenai Lowland
Map Unit Descriptions
Map Units: D32, D23
Seward Area Extent:
D32: 2 wetland polygons; 5.2 acres.
D23: 2 wetland polygons; 2.1 acres.
A mixed D32 Depression dominated by dwarf birch, crowberry, bog blueberry and fewflower sedge, near the Snow River. A few low spots dominated by tufted bulrush and tall cottongrass have a shallower water table.
Type: Peat, or mineral
Average depth to water table: 20 cm
Organic layer thickness: 150+ cm, at the single peatland, and 20 cm at the single mineral soil wetland measured
Average depth to redoximorphic features: n/a if peat, 8 cm in the single mineral soil wetland measured
Common Plant communities:
Tufted bulrush - dwarf birch (Tricophorum caespitosum - Betula nana)
Sphagnum - tall cottongrass (Sphagnum spp. - Eriophorum angustifolium)
Crowberry - Labrador tea (Empetrum nigrum - Ledum palustre spp. decumbens)
Sphagnum - Ericad (Sphagnum spp. - Ericaceous shrub)
Fewflower sedge - Dwarf birch (Carex pauciflora - Betula nana)
HGM: Terrene Basin Isolated.
These are uncommon peatlands with mixed sedge (D2) and shrub-dominated (D3) components in bedrock depressions not hydrologically connected at or very near the surface with other wetlands. Sedge-dominated components have a water table at or near the surface for most of the growing season, and shrubby components (D3) have a deeper water table. These uncommon wetlands occur either on the bedrock ledges above the Snow River Valley, or on the bedrock knob north of Bear Lake.
|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 15:11