First Advisor

J. Alan Yeakley

Date of Publication

2005

Document Type

Thesis

Degree Name

Master of Science (M.S.) in Environmental Science and Resources

Department

Environmental Science

Language

English

Subjects

Reed canary grass -- Oregon -- Portland, Floods -- Oregon -- Portland, Plant diversity -- Oregon -- Portland, Weeds -- Control -- Oregon -- Portland

DOI

10.15760/etd.5490

Physical Description

1 online resource (95 p.)

Abstract

Recent management efforts in the Smith and Bybee Lakes Wildlife Area (SBL), a 700-ha preserve in north Portland, Oregon, have included using a water control structure to suppress invasive reed canarygrass (Phalaris arundinacea L.) by flooding during spring and early summer growth periods. For the first year of managed flooding, I sought to determine: (a) the extent and distribution of reed canarygrass at SBL; (b) the effectiveness of the change in water level at suppressing reed canarygrass; and ( c) the effects of the change in water level on other plant species.

I established 30 vegetation transects throughout SBL before completion of the water control structure. These transects were randomly distributed, placed perpendicularly to the shorelines of the wetlands, and had a cumulative length of 3.1 km. I measured vegetation on the transects in autumn 2003 and autumn 2004 using the line intercept method at 10-cm intervals. I surveyed the transects to generate elevation profiles, accurate to 0.15 cm, to determine depth and duration of flooding, which I correlated with vegetative changes. I also monitored inundation depth, growth, and phenological response of individual stands of reed canarygrass during the 2004 growing season.

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Comments

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Persistent Identifier

http://archives.pdx.edu/ds/psu/20557

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