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    • Rangeland Ecology & Management, Volume 64 (2011)
    • Rangeland Ecology & Management, Volume 64, Number 6 (November 2011)
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    Can Imazapic Increase Native Species Abundance in Cheatgrass (Bromus tectorum) Invaded Native Plant Communities?

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    Author
    Elseroad, Adrien C.
    Rudd, Nathan T.
    Issue Date
    2011-11-01
    Keywords
    annual grass invasion
    herbicide control
    invasive plants
    restoration
    
    Metadata
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    Citation
    Elseroad, A. C., & Rudd, N. T. (2011). Can imazapic increase native species abundance in cheatgrass (Bromus tectorum) invaded native plant communities?. Rangeland Ecology & Management, 64(6), 641-648.
    Publisher
    Society for Range Management
    Journal
    Rangeland Ecology & Management
    URI
    http://hdl.handle.net/10150/642911
    DOI
    10.2111/REM-D-10-00163.1
    Additional Links
    https://rangelands.org/
    Abstract
    Native plant communities invaded by cheatgrass (Bromus tectorum L.) are at risk of unnatural high intensity fires and conversion to cheatgrass monocultures. Management strategies that reduce cheatgrass abundance may potentially allow native species to expand and minimize further cheatgrass invasion. We tested whether the selective herbicide imazapic is effective in reducing cheatgrass and ‘‘releasing’’ native species in a semiarid grassland and shrub steppe in north-central Oregon. The experiment consisted of a completely randomized design with two treatments (sprayed with 70 g ai ha-1 of imazapic and unsprayed) and three replicates of each treatment applied to either 2.5 or 4 ha plots. We repeated this experiment in three different sites dominated by the following native species: 1) bluebunch wheatgrass (Pseudoroegneria spicata [Pursh] A. Löve ssp. spicata) and needle and thread (Hesperostipa comata [Trin. Rupr.] Barkworth), 2) needle and thread and Sandberg bluegrass (Poa secunda J. Presl), and 3) big sagebrush (Artemisia tridentata Nutt.). Nested frequency of all plant species in 1-m2 quadrats was collected for 1 yr pretreatment and 4 yr posttreatment. In all three sites, cheatgrass frequencies were significantly lower in sprayed plots than unsprayed plots for 3-4 yr posttreatment (P<0.1). Other annual plant species were also impacted by imazapic, but the effects were highly variable by species and site. Only two native perennial species, hoary tansyaster (Machaeranthera canescens [Pursh] Gray) and big sagebrush, increased in sprayed plots, and increases occurred only at two sites. These results suggest that a short-term reduction in cheatgrass alone is not an effective strategy for increasing the abundance of most native perennial plant species.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2111/REM-D-10-00163.1
    Scopus Count
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    Rangeland Ecology & Management, Volume 64, Number 6 (November 2011)

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