|Sweetgale – Shrubby cinquefoil|
|Myrica gale – Dasiphora floribunda|
|n = 27|
|II.C.2.d. Open Low Shrub Birch - Ericaceous Shrub Bog.|
|Ecosystem: Relict Lakebed|
This type has been described on the Kenai lowlands (Rosenberg, 1986) and elsewhere in Alaska, although shrubby cinquefoil (Dasiphora floribunda) is uncommon as a co-dominant. It is not present on the Chugach National Forest (DeVelice, et. al., 1999) or Copper River (Boggs, 2000) species lists.
Sweetgale (Myrica gale) - shrubby cinquefoil is a widespread and common plant community, especially on slightly elevated strangs on relict glacial lakebeds. Strangs are linear ridges 1-2 m high oriented perpendicular to groundwater flow. For more information on patterned fens, see the relict glacial lakebed ecosystem description.
Sweetgale dominates a low shrubby community, with lower amounts of shrubby cinquefoil and dwarf birch (Betula nana). Bog blueberry (Vaccinium uliginosum) is frequently present, along with trace amounts of bog rosemary (Andromeda polifolia). Tall cottongrass (Eriophorum angustifolium) can be common. Where strangs are absent this community can be present as a broad, homogeneous stand with open water in micro-topographic low-spots.
Peat is usually over a meter deep, and the water table is
typically within 20 cm of the surface, although at two sites it was
encountered at almost a meter deep. At
the three sites where it was measured, pH is moderately acid (5.8).
All the plots visited qualify as jurisdictional wetlands.
Table 1. Frequency of occurrence and hydric status of soil series named at NRCS holes. Bold type indicates soils on the NRCS Alaska hydric soils list.
|STARICHKOF||10||1, 2B2, 3|
|1Proposed series, definitely hydric|
2. Summary of plant frequency and average cover for plants occurring
in more than 50% of plots .
|Wetland Indicator Status|
|stunted Picea X lutzii||0.6||2.7||np|
|Dasiphora floribunda||1.0||19.4||FAC||FAC-, FACW
|Betula nana||1.0||13.1||FAC||FAC, OBL|
|Vaccinium uliginosum||0.7||2.2||FAC||FACU+, FACW
|Empetrum nigrum||0.6||5.2||FAC||FACU, FACW|
|Ledum palustre ssp. decumbens||0.6||3.7||FACW||FACW|
|Swertia perennis||0.6||0.6||FACW||FAC+, FACW+|
|Equisetum arvense||0.6||6.4||FAC*||FAC*, FACW-
|np- not present on the wetland indicator status list|
|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 09:50