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    • Rangeland Ecology & Management, Volume 67 (2014)
    • Rangeland Ecology & Management, Volume 67, Number 2 (March 2014)
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    Root biomass and distribution patterns in a semi-arid mesquite savanna: Responses to long-term rainfall manipulation

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    Author
    Ansley, R. J.
    Boutton, T. W.
    Jacoby, P. W.
    Issue Date
    2014-03
    Keywords
    Carbon isotope ratio
    Carbon sequestration
    Climate change
    Leaf water potential
    Root-to-shoot ratio
    Woody plant encroachment
    
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    Citation
    Ansley, R. J., Boutton, T. W., & Jacoby, P. W. (2014). Root biomass and distribution patterns in a semi-arid mesquite savanna: Responses to long-term rainfall manipulation. Rangeland Ecology & Management, 67(2), 206–218.
    Publisher
    Society for Range Management
    Journal
    Rangeland Ecology & Management
    URI
    http://hdl.handle.net/10150/657025
    DOI
    10.2111/REM-D-13-00119.1
    Additional Links
    https://rangelands.org/
    Abstract
    Expansion of woody plants in North American grasslands and savannas is facilitated in part by root system adaptation to climatic extremes. Climatic extremes are predicted to become more common with global climate change and, as such, may accelerate woody expansion and/or infilling rates. We quantified root biomass and distribution patterns of the invasive woody legume, honey mesquite (Prosopis glandulosa), and associated grasses following a long-term rainfall manipulation experiment in a mixed grass savanna in the southern Great Plains (United States). Root systems of mature trees were containerized with vertical barriers installed to a depth of 270 cm, and soil moisture was manipulated with irrigation (Irrigated) or rainout shelters (Rainout). Other treatments included containerized, precipitation-only (Control) and noncontainerized, precipitation-only (Natural) trees. After 4 yr of treatment, soil cores to 270 cm depth were obtained, and mesquite root length density (RLD) and root mass, and grass root mass were quantified. Mesquite in the Rainout treatment increased coarse-root (->-2 mm diameter) RLD and root mass at soil depths between 90 cm and 270 cm. In contrast, mesquite in the Irrigated treatment increased fine-root (-<-2 mm diameter) RLD and root mass between 30 cm and 270 cm depths, but did not increase total root mass (fine-+-coarse) compared to the Control. Mesquite root-to-shoot mass ratio was 2.8 to 4.6 times greater in Rainout than the other treatments. Leaf water stress was greatest in the Rainout treatment in the first year, but not in subsequent years, possibly the result of increased root growth. Leaf water use efficiency was lowest in the Irrigated treatment. The increase in coarse root growth during extended drought substantially increased mesquite belowground biomass and suggests an important mechanism by which woody plant encroachment into grasslands may alter below ground carbon stocks under climate change scenarios predicted for this region. © 2014 The Society for Range Management.
    Type
    Article
    text
    Language
    en
    ISSN
    0022-409x
    ae974a485f413a2113503eed53cd6c53
    10.2111/REM-D-13-00119.1
    Scopus Count
    Collections
    Rangeland Ecology & Management, Volume 67, Number 2 (March 2014)

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