Wetland Classification and Mapping of the Kenai Lowland, Alaska

 

 

Map Unit Descriptions

 

Ecosystem: Discharge Slope

 

Map Component: SS

 

Extent: 314 wetland polygons; 1579.4 ha; 1.11% of wetland area; 1.90% of wetland polygons.

A broad, willow-dominated discharge slope wetland in the upper Anchor River Watershed (polygon 10280).

Wetland Indicators

Type: Mineral Soil

Average depth to water table: 31.1 cm; n=13

Organic layer thickness: 44.5 cm; n=15

Average depth to redoximorphic features: 26.1 cm; n=7

Common Soils: STARICHKOF, TLIKAKILA, SNOWDANCE, FORELAND, DOROSHIN

Common Plant communities:

Barclay willow / Rich

Barclay willow / Bluejoint - Field horsetail

Barclay willow / Bluejoint / Marsh fivefinger

Tealeaf willow / Crowberry

 

NWI: PSS1Bn

HGM: Terrene Slope groundwater-dominated Throughflow, if wetlands above and below.  If wetlands only below, then: Terrene Slope Outflow.

Accuracy assessment: 51 polygons interpreted as SS on aerial photographs were field checked.  36 remained SS.  2 were revised to K2, 1 each was revised to AMT, DW21, DW2-5A, H3, K23, K34, LB26, LB4, LSP, RB, SC, SSL and upland.

 

SS is the Discharge Slope map component dominated by willow, typically Barclay willow (Salix barclayi).  These components occupy wetter discharge slopes, or slopes at higher elevation, and are found adjacent to most ecosystems, but predominately south of Clam Gulch.  They are more common near riparian zones, and on the denser till of the late-Wisconsin aged surfaces on the southern Lowlands.

This is a common mononomial unit, especially along toeslopes of stream valley walls and adjacent to higher elevation peatlands.  It also occurs in complex, most commonly with the Lutz spruce (Picea X lutzii) dominated map component (SL).

 


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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

15 November 2005 15:05