- Composition and structure of Oregon ash
(Fraxinus latifolia) woodlands in the William L. Finley
National Wildlife Refuge, Oregon are described. Twenty
stands dominated by Fraxinus latifolia were sampled with
500 m2 circular macroplots in which floristic microplot
data were collected for plant community synthesis. Plant
communities were identified by computer-assisted tabular
analysis and hierarchical agglomerative clustering.
Community structure was analyzed from tree-diameter
Two provisional plant communities are identified:
Fraxinus latifolia/Carex obnupta and Fraxinus latifolia/
Symphoricarpos albus. The Carex obnupta community was
characterized by C. obnupta, Eleocharis acicularis arid
Galium trifidum. Little shrub cover and appreciable
bare ground were typical. Carex and Eleocharis often
formed single-species patches within the stands. Overstory
tree canopy was closed and most plots contained
many small-diameter trees and reproductive stems and
few large diameter trees. Fraxinus tree size-class
distribution approximates an attenuated reverse Jshaped
The Symphoricarpos albus community was marked by
much shrub cover, principally provided by S. albus, Rubus
ursinus and Rosa nutkana. Herb cover also was great in
which Agrostis aequivalvis, Galium aparine, Geum
macrophyllum, Montia sibirica, Ranunculus unicinatus
and Stel].aria calycantha were prominent. Overstory tree
cover was more open than in the Carex obnupta community.
Tree diameter age-class distribution was even, and total
basal area larger than for the Carex community. Although
environmental data were not collected, the Fraxinus/Carex
community was observed on slightly lower "back-water" areas
more distant from the water courses while the Fraxinus/
Symphoricarpos community was found either on stream
natural levees or at outer margins of the lower "backwater"
areas away from streams.
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