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University of Arizona (1993)

Evaluation of roadside revegetation in central Arizona

Brooks, Margaret Ann

Titre : Evaluation of roadside revegetation in central Arizona

Auteur : Brooks, Margaret Ann.

Université de soutenance : University of Arizona

Grade : Doctor of Philosophy (PhD) 1993

Résumé
The policies of the USDA Forest Service and the Arizona Department of Transportation require revegetation of land disturbed by road construction. Revegetation objectives of both agencies include soil stabilization and mitigation of visual impacts. Typical seed mixes include Lehmann and Cochise lovegrass (Eragrostis Lehmanniana), crested wheatgrass (Agropyron cristatum), desert buckwheat (Eriogonum fasciculatum), fourwing saltbush (Atriplex canescens), and other species as appropriate. Seeding is done by drilling on slopes of 3:1 or flatter ; hydroseeding is used on slopes steeper than 3:1. A mulch of blown-on straw, affixed with a vegetative tackifier, is typically applied after seeding. This study documented plant cover and density on roadside cuts and fills which were revegetated over a period of 7 years (1985-92). Plant cover and density were measured on cut and fill slopes and regressed against various independent environmental variables, including aspect, slope gradient, and soil particle size. The soil surface at each site was evaluated to assess success in soil stabilization. Success in mitigating visual impacts was evaluated by having university students rate the appearance of vegetation on each site. Results obtained in this study suggest that revegetation has been successful in meeting the stated objectives on fill sites, but not on cut sites.

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