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Fig. 1. Sediment retention for different combinations of buffer width, vegetation type, and clipping treatment (mean percent of applied sediment retained + standard error). Vegetation types are UP = bunchgrass upland, TR = rush transition, and WET = sedge wetland. The left-hand scale expresses sediment retention as the percent of the approximately 50 kg (36 L) of sediment applied; percent retention = 100 x [(50 - kg sediment yield)/50]. The right-hand scale shows corresponding sediment yields in kg per simulation. Letters above each pair of bars represent comparisons of vegetation types within each buffer width; sediment retention means for vegetation types sharing the same letter were not significantly different. Within each vegetation type, sediment retention decreased significantly with each decrease in buffer width (differences not indicated on figure). Sediment retention did not differ significantly between clipping treatments, and clipping treatments did not influence effects of buffer width or vegetation type. See text for supporting statistics.
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