United States Department of Transportation
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Using reinforced native grass sod for biostrips, bioswales, and sediment control.
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2008-12-01
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[PDF-3.84 MB]
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Abstract:The objective of this research was to develop and demonstrate native grass sod for sediment control from disturbed lands associated with California highways. The research evaluated native grass species for inclusion in sod and evaluated the sod at a California highway field site. Seed mixes, including rhizomatous and bunchgrass species, were evaluated in a greenhouse setting for six California ecoregions. Growth and sod development potential of each seed mix for each ecoregion were evaluated. Seed mixes for three California ecoregions were further evaluated with a reinforcement material, and for establishment and weed suppression. Establishment and weed suppression of select ecoregion seed mixes and reinforcement materials were evaluated. Results indicated that multispecies sod has potential for use in revegetation of disturbed lands associated with highways. Native grass seed mix designs developed for the California Grassland ecoregion were field tested on a highway steep slope and swale area near Sacramento. Following an eight month propagation period, a sod composed of four native grass species was transplanted using conventional harvest and transport procedures. The sod resisted weed invasion from the underlying soil seed bank, no bare ground was present, and sediment loss was exceptionally low (0.1-0.6 tons/hectare/year). Native grass sod was more expensive to implement compared with conventional hydroseeding, but their long-term maintenance and environmental costs associated with weed control, mowing, soil erosion, and fire control are expected to be much lower
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