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Barclay's willow / Tufted hairgrass – Bluejoint |
Salix barclayi / Deschampsia caespitosa - Calamagrostis canadensis | |
n = 4 | |
II.C.2.g. Open Low Willow Scrub | |
Ecosystem: Depression, Relict Lakebed |
This uncommon
Kenai Lowlands community is included within the Barclay's willow
(Salix barclayi) – mixed herb community
documented by others (DeVelice
et.al., 1999; Boggs, 2000; Shephard, 1995). Tufted hairgrass (Deschampsia caespitosa)
cover is greater on Kenai Lowlands sites.
Three of the sites visited occur in depression-like features on the terraced moraines fronting the western slope of the Caribou hills. The fourth is at the edge of a large isostatically rebounded marine terrace along Coho Loop Road, near Kasilof.
Barclay's willow / tufted hairgrass - bluejoint communities are characterized by a low, patchy Barclay's willow thicket interspersed with bluejoint (Calamagrostis canadensis) and tufted hairgrass in nearly equal proportions. These communities are diverse, with arctic blackberry (Rubus arcticusand dwarf birch (Betula nanapresent in trace amounts, and variegated sedge (Carex stylosa), jacob’s ladder (Polemonium acutiflorumboreal sage (Artemisia arctica), field horsetail (Equisetum arvensemountain hairgrass (Vahlodea atropurpurea), boreal yarrow (Achillea millefolium var. borealis) and felwort (Swertia perennis) usually present.
Organic horizons are thin, although one of the three plots has a histic epipedon (33 cm thick). The water table is generally near the surface, but at one site redoximorphic features were measured at 58 cm below the surface. Three of the four sites visited qualify as 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.
Soil Series | n | Hydric Criteria Number |
CHUNILNA | 2 |
2B3 |
TRUULI1 | 1 | |
1Proposed series, definitely hydric |
Table
2. Summary of plant frequency and average cover for plants occurring
in more than 50% of plots
Wetland Indicator Status | |||||
f | Average Cover | Alaska | National | ||
Shrub | |||||
Salix1 barclayi | 1.0 | 37.5 | FAC | FAC, FACW |
|
Dwarf shrub | |||||
Betula nana | 1.0 | 0.6 | FAC | FAC, OBL |
|
Herbs/Graminoids | |||||
Deschampsia caespitosa2 | 1.0 | 47.5 | FAC | FAC, FACW+ |
|
Calamagrostis canadensis | 1.0 | 40.5 | FAC | FAC, OBL | |
Rubus arcticus | 1.0 | 0.6 | FAC | FAC | |
Carex stylosa | 0.8 | 3.7 | OBL | OBL | |
Polemonium acutiflorum | 0.8 | 0.4 | FAC | FAC | |
Artemisia arctica | 0.8 | 0.4 | na |
||
Equisetum arvense | 0.8 | 0.1 | FAC* | FAC*, FACW- |
|
Achillea millefolium var. borealis | 0.8 | 0.1 | FACU | UPL, FACU | |
Vahlodea atropurpurea | 0.8 | 0.1 | FACW* | FAC+, FACW |
|
Swertia perennis | 0.8 | 0.1 | FACW | FAC+, FACW+ | |
Moss | 1.0 | 48.0 |
|||
Lichen | 0.8 | 0.1 | |||
1 Plant with known morphological adaptation for occurrence in wetlands (USACE, 1987) | |||||
2 Plant with known physiological adaptation for occurrence in wetlands (USACE, 1987) |
Introduction and Key to Plant Communities |
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Contact: Mike Gracz Kenai Watershed Forum PO Box 15301 Fritz Creek, AK 99603 907-235-2218 |
The
Alaska Natural Heritage Program
Environment
and Natural Resource Institute
University of
Alaska, Anchorage
707 A Street, Suite 101
Anchorage, Alaska 99501
04 May 2007 10:01 |