|Tufted bulrush – Tall cottongrass|
|Trichophorum caespitosum – Eriophorum angustifolium|
|n = 17|
|III.A.3.k. Subalpine Lowland Sedge-Moss Bog Meadow|
|Ecosystem: Relict Lakebed / Drainageway, Kettle|
This type is apparently unique to the Kenai. DeVelice, et. al. (1999) describe a nominally similar type for Chugach National Forest, but with less tufted bulrush (Trichophorum caespitosum) dominance and greater shrub representation (ERIANG - TRICAE). Dachnowski-Stokes (1941), and Streveler, et. al. (1973) describe a tufted bulrush – cottongrass – whitebeak sedge / sphagnum moss type; and several authors describe tall cottongrass (Eriophorum angustifolium) types (Boggs, 2000; Craighead, et. al., 1988; Racine and Anderson, 1979; Holowaychuk and Smeck, 1979, in Viereck, et. al., 1992; Racine, 1976), which Viereck, et. al. (1992) list as primarily a tundra (permafrost) type.
Tufted bulrush – tall cottongrass communities occur on kettles and relict glacial lakebeds and drainageways throughout the lowlands.
Bulrush dominates the community and cottongrass is present at woodland densities. Dwarf birch (Betula nanaand bog rosemary (Andromeda polifolia) are present, and bog cranberry (Vaccinium oxycoccoss usually present in trace amounts. A sphagnum mat is typically continuous, though sometimes sedge tussocks alternate with low sphagnum hummocks.
The organic horizon is usually greater than 1.5
meters thick (60”) and the water table is often at the surface or just below
it. The pH was measured at only two sites,
a strongly acid 5.4 and 5.5. All 17
sites visited are jurisdictional wetlands.
Table 1. Frequency of soil series occurrence and hydric status at NRCS holes. Bold type indicates soils on the NRCS Alaska hydric soils list.
2. Summary of plant frequency and average cover for plants occurring
in more than 50% of plots .
|Wetland Indicator Status|
|Betula nana||0.9||4.7||FAC||FAC, OBL
|1,2 Plant with known morphological and physiological adaptation for occurrence in wetlands (USACE, 1987)|
|Contact: Mike Gracz Kenai Watershed Forum PO Box 15301 Fritz Creek, AK 99603 907-235-2218||
Alaska Natural Heritage Program
and Natural Resource Institute
707 A Street, Suite 101
Anchorage, Alaska 99501
04 May 2007 10:04