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    • Rangeland Ecology & Management, Volume 62, Number 5 (September 2009)
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    Root Responses to Short-Lived Pulses of Soil Nutrients and Shoot Defoliation in Seedlings of Three Rangeland Grasses

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    Author
    Arredondo, José Tulio
    Johnson, Douglas A.
    Issue Date
    2009-09-01
    Keywords
    Agropyron cristatum
    Agropyron desertorum
    Bromus tectorum
    clipping
    nutrient-enriched soil patches
    Pseudoroegneria spicata
    root foraging
    soil-nutrient heterogeneity
    soil resources
    
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    Citation
    Arredondo, J. T. & Johnson, D. A. (2009). Root responses to short-lived pulses of soil nutrients and shoot defoliation in seedlings of three rangeland grasses. Rangeland Ecology & Management, 62(5), 470-479.
    Publisher
    Society for Range Management
    Journal
    Rangeland Ecology & Management
    URI
    http://hdl.handle.net/10150/643053
    DOI
    10.2111/08-151.1
    Additional Links
    https://rangelands.org/
    Abstract
    Root proliferation is important in determining root foraging capability of rangeland grasses to unpredictable soil-nutrient pulses. However, root proliferation responses are often confounded by the inherent relative growth rate (RGR) of the particular species being compared. Additionally, inherent biomass allocation to roots (R:S ratio) can be associated with root RGR, hence likely influencing root foraging responses. The influence of relative growth rate and biomass allocation patterns on the speed and efficiency of root foraging responses at the critical seeding stage was examined in two important perennial rangeland grasses that occur widely in the Great Basin Region of the United States (Whitmar bluebunch wheatgrass [Pseudoroegneria spicata {Pursh} Löve] and Hycrest crested wheatgrass [Agropyron desertorum {Fisch. ex Link} Schult. 3 A. cristatum L. Gaert.]) as well as in the widespread exotic invasive annual grass, cheatgrass (Bromus tectorum L.). Greenhouse-grown seedlings were exposed to four nutrient regimes: uniform-low, uniform-high, soil-nutrient pulse, soil-nutrient depletion, and to either no clipping or clipping (80% removal of standing shoot biomass). Hycrest was the only species that exhibited root proliferation responses to the short- lived nutrient pulse, and this response occurred through root elongation rather than initiation of lateral root branches. Overall, defoliation inhibited proliferation-based root responses to a larger extent than topological-based root responses. Defoliated plants of Hycrest interrupted root development (topological index did not change) following shoot defoliation compared to undefoliated plants. In contrast, root topological developmental patterns were the same for defoliated and undefoliated plants of Whitmar, whereas cheatgrass exhibited an intermediate response between Whitmar and Hycrest. Our results suggest that inherent biomass allocation to roots contributes to enhanced capabilities of proliferation-based root responses. 
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2111/08-151.1
    Scopus Count
    Collections
    Rangeland Ecology & Management, Volume 62, Number 5 (September 2009)

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