Approaches to Revegetate Shorelines at Lake Wallula on the Columbia River, Washington-Orgeon.
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. Transplanted vegetation was subjected to various inundation treatmetns and survival and growth responses were evaluated. 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 successsful 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. Study results show that several species have a potential for use in shoreline revegetation efforts. Environmental constraints other than flooding effects were identified.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1986
- Accession Number
- ADA166943
Entities
People
- R. D. Comes
- Timothy Mccreary