Abstract Nearly all of the research on vegetation filters has been conducted on acid to neutral wetland soils. However, many of the riparian soils in Wyoming cropland and rangeland areas are characterized as sodic or saline. The relative amount of nitrate removal from groundwater through denitrification and plant uptake may be quite different under semi-arid land conditions and should be determined in a more realistic setting for western riparian areas. Hybrid willow (Salix matsudana X alba), Jose tall wheatgrass (Agropyron etongatum), Alkar tall wheatgrass (Agropyron elongatum), Whitmar beardless wheatgrass (Agropyron spicatum f. inerme). Garrison creeping foxtail (Alopecurus pratensis), and Magnar basin wildrye (Etymus cinereus) were subjected to 3 levels of salinity and 5 different concentrations of phosphorus and nitrogen inputs. Establishment rates of willows and grasses, above- and below-ground biomass production, and uptake of phosphorus and nitrogen were measured. Preliminary results for willow and grass establishment and above- and below-ground biomass are presented.
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