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.
Average depth to water table: 10 cm
Organic layer thickness: 146 cm
Average depth to redoximorphic features: n/a
Common Plant communities:
Water horsetail (Equisetum fluviatle)
Sphagnum - Tall cottongrass (Eriophorum angustifolium)
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.
|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 15:16