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Solarization to control downy brome (Bromus tectorum) for small-scale ecological restoration

Published online by Cambridge University Press:  29 April 2019

Matthew R. Orr Open the ORCID record for Matthew R. Orr [Opens in a new window] ,
Ron J. Reuter  and
Shanti J. Murphy
Matthew R. Orr*
Affiliation:
Assistant Professor, Department of Integrative Biology, Oregon State University–Cascades, Bend, OR, USA
Ron J. Reuter
Affiliation:
Associate Professor, Department of Forest Ecosystems and Society, Oregon State University–Cascades, Bend, OR, USA
Shanti J. Murphy
Affiliation:
Undergraduate Student, Oregon State University–Cascades, Bend, OR, USA
*
Author for correspondence: Matthew R. Orr, OSU–Cascades, 1500 SW Chandler Avenue, Bend, OR 97702. (Email: [email protected])
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Abstract

Downy brome (Bromus tectorum L.) is a common impediment to ecological restoration, because its seedbank remains viable after repeated treatment with herbicides. Soil solarization has been used in ecological restoration to control seedbanks of invasive plants. Here we test the efficacy of soil solarization to reduce B. tectorum cover and establish native plants at a site in B. tectorum’s core invasive range with a long history of disturbance and infestation. Solarization raised soil temperatures by as much as 13 C and reduced B. tectorum densities by approximately 20-fold. In 30 plots solarized for 0 to 101 d, B. tectorum emerged in inverse abundance to treatment duration. Broadleaf weeds were less abundant than B. tectorum before treatment, and diminished under solarization, but their response to solarization was weaker than B. tectorum’s, and they emerged in greater numbers than B. tectorum 2 to 3 yr after treatment. When seeded after solarization, a native perennial bunchgrass, squirreltail [Elymus elymoides (Raf.) Swezey], did not differ in abundance between solarized and control plots. Solarization may facilitate B. tectorum control on a small scale without jeopardizing the establishment of native plants, but only if treatment durations are long and subsequent management of broadleaf weeds and remnant B. tectorum is planned.

Keywords

Assisted successioncheatgrasssagebrush shrub-steppeseedbank
Type
Research Article
Information
Invasive Plant Science and Management , Volume 12 , Issue 2 , June 2019 , pp. 112 - 119
Copyright
© Weed Science Society of America, 2019 

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Footnotes

Associate Editor: Edith Allen, University of California, Riverside

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