The influences of buffer width and slope, vegetation characteristics, and stubble height on sediment retention were examined at the Montana Agricultural Experiment StationÃ¢â‚¬â„¢s Red Bluff Research Ranch in Southwestern Montana (45Ã‹Å¡35Ã¢â‚¬â„¢N, 111Ã‹Å¡40Ã¢â‚¬â„¢W). Four upland (bunchgrasses), five transitional (dominated by Baltic rush with some grasses), and four wetland (Northwest Territory sedge and other sedges) paired plots were established. Two clipping treatments (2-3 cm stubble-severe and 10-15 cm-moderate) and six runoff sediment simulations (silt at 6 m, fine sand at 6m, silt at 2m, fine sand at 2m, silt at 1m and fine sand at 1m) were tested. Water and sediment were released at a set distance above the bottom of the plot and allowed to flow through the plot. These simulations occurred during June- August 1999. Clipping was done immediately before runoff simulation. Runoff samples were taken immediately after addition of sediment and then again between 15 seconds and 5 minutes until simulations were complete. Slope, runoff and sediment retention were analyzed with vegetation type, clipping treatment and buffer width.
Sediment retention in rangeland riparian buffers