Wetland Classification and Mapping
of Seward, Alaska
Map Unit Descriptions
Ecosystem: Headwater Fen
Map Units: H34; H43
Seward Area Extent:
H34; 5 wetland polygons; 35.8 acres
H43: 1 wetland polygon; 1.1 acres
Mountain hemlock forest dominates the H4 foreground of this photo, with fewflower sedge (H3) in the openings behind.
Type: Peat or mineral soil
Average depth to water table: 28 cm
Organic layer thickness: 104 cm if peat, 13 if mineral soil
Average depth to redoximorphic features: n/a, if peat, 20 cm if mineral soil
Common Plant communities:
Fewflower sedge (Carex pauciflora)
Mountain hemlock / early blueberry (Tsuga mertensiana / Vaccinium ovalifolium)
NWI: PSS1,3&4Eg (H3); PFO4Eg (H4)
HGM: Terrene Basin groundwater-dominated Throughflow headwater.
Mountain hemlock with an early blueberry understory in a Headwater Fen ecosystem wetland indicates H4. H3 fens are dominated by fewflower sedge. Where the forest predominates (at a single wetland) a fen is named H43, when sedge dominates it is named H34.
Headwater Fen Ecosystem wetlands are sloping peatland fens 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.
|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 15:17