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Effect of Pseudoroegneria spicata (bluebunch wheatgrass) Seeding Date on Establishment and Resistance to Invasion by Bromus tectorum (cheatgrass)

Effect of Pseudoroegneria spicata (bluebunch wheatgrass) Seeding Date on Establishment and... <p>ABSTRACT:</p><p>Rangelands degraded by non-native annual grasses are commonly restored by integrating herbicide with fall seeding of native perennial grasses. Seeds are expected to remain dormant throughout winter and emerge in spring. However, restoration often fails due to annual grass seedlings out-competing seeded grasses because they emerge sooner and grow faster. At two sites in Montana, we tested eight seeding dates of <i>Pseudoroegneria spicata</i> to determine the effect on resistance to invasion by the annual grass <i>Bromus tectorum</i>. After one growing season, fall (November) and early spring (April) seeding resulted in larger <i>P. spicata</i> than later spring seeding (May) (829–1,180 tillers per m2 versus 349–561 tillers per m2) at one site, while seeding date had no effect on <i>P. spicata</i> at the second site. In the second season and after <i>B. tectorum</i> introduction, fall and early spring seeded <i>P. spicata</i> was more resistant to <i>B. tectorum</i> compared to late spring seeded. For example, <i>B. tectorum</i> was less dense (480 ± 101 tillers per m2) in <i>P. spicata</i> stands seeded 7 April than 12 May (943 ± 188 tillers per m2), and <i>B. tectorum</i> biomass was lower in fall-seeded stands (227 ± 81 g per m2) than stands seeded 12 May (533 ± 206 g per m2). Our results demonstrate that establishment and subsequent invasion resistance is enhanced by seeding native grasses from fall to early spring, presenting a wider timeframe for seeding than commonly practiced.</p> http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Ecological Restoration University of Wisconsin Press

Effect of Pseudoroegneria spicata (bluebunch wheatgrass) Seeding Date on Establishment and Resistance to Invasion by Bromus tectorum (cheatgrass)

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Publisher
University of Wisconsin Press
Copyright
Copyright © Board of Regents of the University of Wisconsin System
ISSN
1543-4079

Abstract

<p>ABSTRACT:</p><p>Rangelands degraded by non-native annual grasses are commonly restored by integrating herbicide with fall seeding of native perennial grasses. Seeds are expected to remain dormant throughout winter and emerge in spring. However, restoration often fails due to annual grass seedlings out-competing seeded grasses because they emerge sooner and grow faster. At two sites in Montana, we tested eight seeding dates of <i>Pseudoroegneria spicata</i> to determine the effect on resistance to invasion by the annual grass <i>Bromus tectorum</i>. After one growing season, fall (November) and early spring (April) seeding resulted in larger <i>P. spicata</i> than later spring seeding (May) (829–1,180 tillers per m2 versus 349–561 tillers per m2) at one site, while seeding date had no effect on <i>P. spicata</i> at the second site. In the second season and after <i>B. tectorum</i> introduction, fall and early spring seeded <i>P. spicata</i> was more resistant to <i>B. tectorum</i> compared to late spring seeded. For example, <i>B. tectorum</i> was less dense (480 ± 101 tillers per m2) in <i>P. spicata</i> stands seeded 7 April than 12 May (943 ± 188 tillers per m2), and <i>B. tectorum</i> biomass was lower in fall-seeded stands (227 ± 81 g per m2) than stands seeded 12 May (533 ± 206 g per m2). Our results demonstrate that establishment and subsequent invasion resistance is enhanced by seeding native grasses from fall to early spring, presenting a wider timeframe for seeding than commonly practiced.</p>

Journal

Ecological RestorationUniversity of Wisconsin Press

Published: Aug 25, 2020

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