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Title: Approaches to revegetate shorelines at Lake Wallula on the Columbia River, Washington-Oregon
Authors: United States. Agricultural Research Service.
Environmental and Water Quality Operational Studies (U.S.)
Comes, R. D. (Richard Durward), 1931-
McCreary, Timothy.
Keywords: Columbia River
Flood-tolerant vegetation
Washington (State)
Shoreline protection
Shore protection
Aquatic plants
Publisher: Engineer Research and Development Center (U.S.)
Series/Report no.: Technical Report (Environmental Laboratory) ; E-86-2
Abstract: This report summarizes 3 years of field studies at Lake Wallula, Washington-Oregon (McNary Reservoir), for the purpose of identifying plant species and revegetation techniques adaptable to reservoir shorelines within the US Army Engineer Districts, Portland and Walla Walla. The approach used was to subject transplanted vegetation to various inundation treatments and to evaluate survival and growth responses. The experimental design included plantings in a subimpoundment in which water levels were controlled, and on two shoreline sites (a mudflat and a sandy beach). Twenty-nine native and naturalized riparian species were tested. In the controlled impoundment test site, willows (Salix fragilis and Salix purpurea), dwarf spikerush (Eleocharis coloradoensis), and two sedges (Carex obnupta and C. rostrata) were the most successful species. Inundation depth and duration were found to directly affect performance of the tested plant species. The impact of weather and wildlife confounded treatment effects on plant growth and survival at the shoreline sites. Only softstem bulrush (Scirpus validus) survived all inundation treatments on the shoreline for the duration of the study. Results of this study show that several species have a potential for use in shoreline revegetation efforts. Environmental constraints other than flooding effects were identified, but means to mitigate their influence will require further study. The information gathered in this study is applicable to other shoreline sites on power production reservoirs in the region.
Description: Technical Report
Rights: Approved for public release; distribution is unlimited.
Types of Materials: PDF/A
Appears in Collections:Technical Report

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