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    • Journal of Range Management, Volume 46 (1993)
    • Journal of Range Management, Volume 46, Number 3 (May 1993)
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    Decomposition of blue grama and rough fescue roots in prairie soils

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    Author
    Dormaar, J. F.
    Willms, W. D.
    Issue Date
    1993-05-01
    Keywords
    degradation
    physical properties
    comminution of roots
    soil organic matter
    physicochemical properties
    chernozemic soils
    roots
    Festuca campestris
    Alberta
    Bouteloua gracilis
    pasture plants
    prairie soils
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    Citation
    Dormaar, J. F., & Willms, W. D. (1993). Decomposition of blue grama and rough fescue roots in prairie soils. Journal of Range Management, 46(3), 207-213.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/644532
    DOI
    10.2307/4002608
    Additional Links
    https://rangelands.org/
    Abstract
    The mass of grass roots of blue grama (Bouteloua gracilis (HBK.) Lag. ex Steud) and rough fescue (Festuca campestris Rydb.) to a depth of 13 cm is similar but the carbon contents of their respective soils are quite different. The objective of the present study was to determine some of the physical and chemical changes of blue grama and rough fescue root masses during decomposition under both Brown (Mixed Prairie) and Black Chernozemic (Fescue Prairie) soil-forming conditions. Roots of each species in fine-mesh nylon bags were buried in the Ah horizon of both a Brown and a Black Chernozemic soil. Sixteen collections were made between November 1987 and June 1989 to determine diminution, loss of dry matter and gross energy, and changes in the concentration of carbon, nitrogen, methoxyl groups, alkaline-soluble organic acids and phenols, structural and nonstructural carbohydrates, lignin, and monosaccharides. Differences in substrate quality were only partially responsible for the increased decomposition of root mass in the Brown Chernozemic soil-forming environment. Comminution of root mass was significantly greater under the Mixed Prairie than under the Fescue Prairie conditions for both species. The nitrogen content of blue grama roots increased (from 1.17 to 1.56%) while that of rough fescue decreased (from 1.53 to 1.26%) significantly over the duration of the experiments at both sites. Methoxyl group content and energy levels were not useful parameters. Organic acid, phenols, and nonstructural carbohydrate contents decreased with time. Lignin concentration displayed a significant upward trend for both species (from 232 to 280 for blue grama and for 205 to 247 mg/g for rough fescue) in the Black Chernozemic soil only.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4002608
    Scopus Count
    Collections
    Journal of Range Management, Volume 46, Number 3 (May 1993)

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