The 2008 Joint Meeting of the Society for Range Management and the America Forage and Grassland Council.

Tuesday, January 29, 2008 - 10:20 AM

Sedges Have Edges, but Which Stream Edges for Sedges: Revegetation Following Channel Reconstruction

Sarah Quistberg and Tamzen Stringham. Rangeland Ecology and Management, Oregon State University, 202 Strand Agriculture Hall, Corvallis, OR 97331

Riparian revegetation is an essential component for the maintenance and/or repair of channel stability and function. Sedges within low-gradient riparian systems provide the structure necessary for sediment trapping leading to channel narrowing through bank building processes. Planting success in riparian restoration projects has often failed due to inappropriate species selection, planting locations and/or methodologies. Stream restoration efforts utilizing channel reconstruction methods are increasing in number across the West thus emphasizing the need for knowledge on revegetation methods. Planting success in a recently constructed channel is essential because the lack of vegetation makes the channel highly susceptible to erosion. Sedges play an important role in the stability of low gradient, fine-textured stream channels. Two native sedges, Carex nebrascensis Dewey (Nebraska sedge) and Carex utriculata Boott (beaked sedge) are often used in riparian restoration within the West because they have extensive root systems that can provide bank stability in fine-sediment channels. Survival and expansion were evaluated on greenhouse grown plugs of these two sedge species following transplant within a reconstructed NE Oregon meadow stream. Sedge plugs were planted on two fluvial surfaces along the stream: depositional (pointbars) and erosional surfaces (straight) at or below bankfull flow level. Results show that planting was more successful on depositional surfaces. In addition, Nebraska sedge overall produced more shoots than beaked sedge on both planting locations.