Abstract
ABSTRACT Roadsides are often planted with nonnative, disturbance-tolerant, herbaceous vegetation to enhance plant survival under highly disturbed soil conditions. We investigated vegetation and soils along the Ohio River, West Virginia, USA, at a new bridge crossing (Blennerhassett Island), a bridge crossing 45 yr old (Buckley Island), and an island with no bridge crossing (Muskingum Island) and at three distances from the bridge or center point at each site (0 m [under the bridge], 100 m away, 300 m away). Overall, 170 species (131 herbaceous, 10 shrubs, and 29 trees) were observed. Percent herbaceous cover and basal area of trees were lower at quadrats under the bridges (p < 0.05). Species composition differed at quadrats under the bridges in comparison to distant quadrats (p < 0.05) with exotics such as Japanese millet (Echinochloa crus-galli var. frumentacea P. Beauv.), and Italian perennial rye grass (Lolium perenne L.) prevalent under the new bridge. Numerous soil properties had highly altered level...
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