Wetland Classification and Mapping
of Seward, Alaska
Map Unit Descriptions
Map Unit: T65
Seward Area Extent: 2 wetland polygons; 42.0 acres
T6 is represented by the dense, uniform Lyngbye sedge stand in the foreground of this photo, and T5 by the pools behind. Taken at the head of Resurrection Bay.
Average depth to water table: Varies with tidal stage
Organic layer thickness: not measured
Average depth to redoximorphic features: not measured
Common Plant communities:
Lyngbye's sedge (Carex lyngbyei)
Open water pools
Ramensk's sedge (Carex ramenskii)
Both T65 wetlands are large areas where Lyngbye Sedge and open water pools are mixed together at a scale too fine to map separately at the scale of 1:25,000. They are both found on the Resurrection River delta, at the head of Resurrection Bay.
T6 wetlands are dominated by Lyngbye's sedge (Carex lyngbyei). They are found in the upper sedge marsh zone in the upper reaches of estuaries. Monotypic stands are common. T6 corresponds with Vince and Snow's (1984) 'Inner Sedge Marsh Zone 7', estimated to be inundated on only the highest spring tides, or an average of 2 times per summer on the Susitna Flats (with a range of 0-5 times per summer), in upper Cook Inlet, Alaska. Vince and Snow found that water was retained for greater than 5 days per inundation.
T5 corresponds with Vince and Snow's (1984) 'Outer Sedge Marsh Zone 3', estimated to be inundated on only the highest spring tides, or an average of 3 times per summer on the Susitna Flats (with a range of 0-5 times per summer), in upper Cook Inlet, Alaska. Vince and Snow also found that water was retained for 2-3 days per inundation. Pools with common mare's tail (Hippuris vulgairs) and saltmarsh starwort (Stellaria humifusa) are frequently encountered within this zone; and between it and the landward Lyngbye's sedge (Carex lyngbyei) zone (T6). The rare plant, Kamchatka spikerush (Eleocharis kamchatica) is sometimes encountered in the T5 zone around Cook Inlet. In the more restricted tidal range of Resurrection Bay (compared to Cook Inlet), open mudflats are usually found seaward.
|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 15:30