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- W2018268613 abstract "From 1992 to 1995 we experimentally evaluated the effectiveness of several revegetation treatments along a segment of Going-to-the-Sun Highway in Glacier National Park, U.S.A. This segment, reconstructed during the spring and summer of 1992, is bordered by fescue prairie vegetation and is known to be susceptible to invasion by several alien species, including Centaurea maculosa (spotted knapweed) and Phleum pratense (common timothy). We used a split plot study design to evaluate the effectiveness of herbicide and seeding treatments on assisting recovery of native flora and limiting the establishment of alien species. The herbicide treatment consisted of a yearly herbicide spray application of clopyralid (3,6-dichloropicolinic acid). Five seeding treatments were evaluated, three of which included an indigenous graminoid-forb seed mix. Percent canopy coverages of four species groups—alien graminoids, native graminoids, alien forbs, and native forbs—were determined in July 1995. In addition, community-level patterns in sprayed plots and unsprayed plots were compared with a reference site of native fescue prairie. Herbicide treatments decreased mean canopy coverage of alien forbs (treated = 4.2%, untreated = 23.4%) and increased mean canopy coverage of native graminoids slightly (treated = 6.3%, untreated = 4.0%). But herbicide treatments reduced mean coverage of native forbs (treated = 3.9%, untreated = 8.9%) and likely increased coverage of alien graminoids. Treatments that included a fall 1992 seed mix increased native graminoid coverages 2.8–4.6 times, although coverages were still lower than those attained by alien graminoids. Native and alien forb coverage appeared unaffected by seeding treatments. Species composition was less diverse in sprayed plots and more dominated by alien grasses than in unsprayed plots and the reference site. Areas for additional study are suggested, including seed bank assays to determine treatment effects on recruitment of alien versus native species and the use of native graminoids to create low-diversity communities with high canopy coverages to resist establishment of alien species." @default.
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- W2018268613 date "1998-06-01" @default.
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- W2018268613 title "Roadside Revegetation in Glacier National Park, U.S.A.: Effects of Herbicide and Seeding Treatments" @default.
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- W2018268613 doi "https://doi.org/10.1111/j.1526-100x.1998.06211.x" @default.
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