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    Competition between cheatgrass and two native species after fire: Implications from observations and measurements of root distribution

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    Author
    Melgoza, G.
    Nowak, R. S.
    Issue Date
    1991-01-01
    Keywords
    stress response
    density
    Hesperostipa comata
    Chrysothamnus viscidiflorus
    root systems
    fires
    fire effects
    Bromus tectorum
    length
    growth rate
    spatial distribution
    Nevada
    plant competition
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    Citation
    Melgoza, G., & Nowak, R. S. (1991). Competition between cheatgrass and two native species after fire: Implications from observations and measurements of root distribution. Journal of Range Management, 44(1), 27-33.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/644834
    DOI
    10.2307/4002633
    Additional Links
    https://rangelands.org/
    Abstract
    During 1987 and 1988, a study was conducted in northern Nevada to examine root growth of cheatgrass (Bromus tectorum L.) and 2 native species, needle-and-thread grass (Stipa comata Trin. & Rupr.) and rabbitbrush (Chrysothamnus viscidiflorus (Hook.) NW.), after fire. Profile wall maps were used to determine the distribution of roots in the soil profile for the 2 native species. Root morphology differed between the 2 species: needle-and-thread grass had a flabelliform root system, whereas rabbitbrush had a main tap root with 2-4 major lateral roots. Although total root biomass differed between the species, more than half the root biomass was in the top 0.2 m of soil for both needle-and-thread grass and rabbitbrush. Measurements of root length density were used to evaluate the interaction between root systems of cheatgrass and the native species. Root production of plots with only the native species was not significantly different from that of plots with both the native species and cheatgrass for the first 2 years after fire. Furthermore, root production of plots in a recently burned area was also not significantly different from that in an area burned 12 years prior to our study. Thus, root systems of these species rapidly occupied the belowground space and competed for soil resources after fire, and the presence of cheatgrass partially reduced the root systems of the native species.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4002633
    Scopus Count
    Collections
    Journal of Range Management, Volume 44, Number 1 (January 1991)

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