Barclay's willow / Rich  
Salix barclayi /  Rich   
 n = 43
II.C.1.b. Low Willow
Ecosystem: Discharge Slope

This type has been described for Chugach National Forest (DeVelice et. al., 1999), Copper River Basin (Boggs, 2000) and Yakutat Forelands (Shephard, 1995), but is absent from The Alaska Vegetation Classification (Viereck, et. al., 1992).

Found primarily on the discontinuous dense till covering plateaus above 500 meters elevation, or on foot and toeslopes of terraced moraines higher than 350 meters (1200í), Barclay's willow (Salix barclayi) / rich is common south of Clam Gulch. On these slopes, groundwater discharge or dense till often supports a water table near the surface. 

Barclay's willow / rich communities are characterized by a dense low thicket of Barclay's willow topping a diverse assemblage of graminoids and forbs. Bluejoint (Calamagrostis canadensis) and Canadian burnet (Sanguisorba canadensis) are present, and field horsetail (Equisetum arvense), valerian (Valeriana capitata), arctic blackberry (Rubus arcticus), fireweed (Chamerion angustifolium),  Jacobís ladder (Polemonium acutiflorum) and felwort (Swertia perennis) are often present.  

About a third of the sites visited had at least a histic epipedon, while another third had shallow water tables, while nearly a third are probably not wetlands.  The pH at the three sites measured ranged from extremely (4.4) to strongly acid (5.4).   

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

SNOWDANCE 9 2B3
STARICHKOF 7 1, 2B2, 3
TRUULI1 4
COAL CREEK 3 2B3
CHUNILNA 1 2B3
DOROSHIN 1 1
JACOBSEN 1 2B3
SLIKOK 1 2B3, 3
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

 Plant

f

 Average Cover

  Alaska National
Shrub
Salix1 barclayi   1.0 81.5 FAC FAC, FACW
Herbs/Graminoid
Calamagrostis canadensis   1.0 7.8 FAC FAC, OBL
Sanguisorba canadensis 0.9 18.6 FACW FACW
Equisetum arvense 0.8 40.6 FAC* FAC*, FACW-
Valeriana capitata 0.8 14.8 FAC FAC
Rubus arcticus 0.8 2.1 FAC FAC
Chamerion angustifolium   0.8 3.6 FACU FACU, FAC
Polemonium acutiflorum   0.7 1.1 FAC FAC
Swertia perennis 0.7 2.7 FACW FAC+, FACW+
Trientalis europaea 0.6 0.6 FAC FAC*, FAC
Moss 1.0 56.0
Open water 0.6 1.1
1 Plant with known morphological adaptation for occurrence in wetlands (USACE, 1987)

 


 Introduction and Key to Plant Communities  

Introduction and Key to Ecosystems

    Kenai Hydric Soils    Map Unit Summary    Methods   Glossary


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