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An abstract of the thesis of Noah John Jenkins for the Master of Science in Environmental Science and Resources presented April 29, 2005. Title: First Season Effects of Managed Flooding on the Invasive Species Phalaris arundinacea L. and Shoreline Vegetation Communities in an Urban Wetland. 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 growmg season. Baseline measurements showed that reed canarygrass had 43.7% cover in the shoreline areas of SBL in 2003. This invasive plant had a strong impact on plant diversity; correlation of reed canarygrass cover with Shannon diversity yielded a Spearman's rho value of 0.69 (P<0.05). Measurements of reed canarygrass stands during the 2004 growing season indicated a reduction in mid-season growth and alteration of growth habit for inundated patches as compared to upland stands. Monitoring of the transects during 2004 showed a 2.5% decrease in reed canarygrass cover and an increase in cover for several important native taxa. Using multinomial logistic regression, I determined that deeper inundation and the presence of regenerating willow forest were more likely to produce a decrease in reed canarygrass cover; peak flooding of more that 0.85 m was most likely to yield a net loss of reed canarygrass. My results indicate that deep inundation, particularly when combined with shading, can be effective in suppressing reed canarygrass.

First season effects of managed flooding on the invasive species Phalaris arundinacea L. and shoreline vegetation communities in an urban wetland