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    • Journal of Range Management, Volume 51 (1998)
    • Journal of Range Management, Volume 51, Number 5 (September 1998)
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    Spring defoliation effects on bluebunch wheatgrass: II. Basal area

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    Author
    Clark, P. E.
    Krueger, W. C.
    Bryant, L. D.
    Thomas, D. R.
    Issue Date
    1998-09-01
    Keywords
    Pseudoroegneria spicata
    basal area
    Cervus elaphus
    winter
    spring
    cattle
    phenology
    defoliation
    grazing
    maturity stage
    
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    Citation
    Clark, P. E., Krueger, W. C., Bryant, L. D., & Thomas, D. R. (1998). Spring defoliation effects on bluebunch wheatgrass: II. Basal area. Journal of Range Management, 51(5), 526-530.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/644026
    DOI
    10.2307/4003369
    Additional Links
    https://rangelands.org/
    Abstract
    Spring livestock grazing has been suggested as a tool to improve winter forage quality of bluebunch wheatgrass (Agropyron spicatum [Pursh] Scribn. & Smith). Impacts on plant vigor and survival are important concerns associated with spring grazing. We report basal area change and mortality responses of bluebunch wheatgrass to 3 spring, 1 winter, and 3 spring + winter defoliation treatments. The study was conducted in l993 and 1994 at 2 sites in the Blue Mountains of northeastern Oregon. Basal area of individual plants was measured shortly after application of the spring treatments and again approximately 1 year after treatment. Clipping the entire basal area of bluebunch wheatgrass plants to a 7.6-cm stubble height during the mid-boot phenological stage and during the inflorescence emergence stage produced 7.0 and 7.8% declines in live basal area, respectively. Unclipped control plants and plants having only one-half their basal area clipped to a 7.6-cm stubble height during the mid-boot stage exhibited 5.2 and 18.6% increases in live basal area, respectively. Combining the mid-boot/half-plant treatment with an early winter clipping to a 2.5-cm stubble height reduced the positive live basal area response to 6.0%. No additional declines in live basal area relative to the spring-only treatments were detected for combinations of the early winter treatment with the mid-boot/whole plant treatment and the inflorescence emergence treatment. Experiment-wide plant mortality was only 0.2%. If managed for a moderate level of defoliation where a portion of the basal and of each bunchgrass plant is left undefoliated, livestock grazing during the boot stage should have little negative impact on the vigor and survival of bluebunch wheatgrass under environmental conditions similar to northeastern Oregon.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4003369
    Scopus Count
    Collections
    Journal of Range Management, Volume 51, Number 5 (September 1998)

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