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    • Journal of Range Management, Volume 55 (2002)
    • Journal of Range Management, Volume 55, Number 5 (September 2002)
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    Response of C3 and C4 grasses to supplemental summer precipitation

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    Author
    Skinner, R. H.
    Hanson, J. D.
    Hutchinson, G. L.
    Schuman, G. E.
    Issue Date
    2002-09-01
    Keywords
    root systems
    soil water content
    Pascopyrum smithii
    Bouteloua gracilis
    precipitation
    Wyoming
    grazing intensity
    biomass
    seasonal variation
    botanical composition
    mixed-grass prairies
    species composition
    water stress
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    Citation
    Skinner, R. H., Hanson, J. D., Hutchinson, G. L., & Schuman, G. E. (2002). Response of C3 and C4 grasses to supplemental summer precipitation. Journal of Range Management, 55(5), 517-522.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/643693
    DOI
    10.2307/4003232
    10.2458/azu_jrm_v55i5_skinner
    Additional Links
    https://rangelands.org/
    Abstract
    Rangeland plant productivity and species composition are affected by moisture availability and grazing intensity. We examined warm- and cool-season grass productivity and relative distribution on grazed and ungrazed sites, receiving either natural precipitation or precipitation plus limited supplemental irrigation. The amount of additional water varied depending on rainfall during the previous week and was intended to shorten the interval between precipitation events and provide a more uniform seasonal moisture distribution. Irrigation treatments were superimposed in 1997 and 1998 on paddocks that had not been grazed for about 55 years or continuously stocked during the growing season for 15 years. Cool-season grasses dominated the ungrazed plots, comprising about 90% of the total biomass. In the grazed plots, the proportion of C3 grasses ranged from 30 to 81%. The proportion of C3 grasses in the grazed treatment decreased from spring to fall and decreased with supplemental irrigation. Root biomass was greater and more concentrated near the soil surface in the grazed compared with the ungrazed plots. Irrigation had no effect on root biomass in the grazed plots while irrigation reduced total root biomass and root biomass in the top 5 cm of the soil profile in the ungrazed plots. Irrigation increased total aboveground biomass only at the August 1997 harvest. Aboveground biomass of warm-season grasses, however, increased under irrigation in the grazed plots in August and November 1997 and August 1998. These increases, however, were offset by a reduction in cool-season grasses in November 1997 and August 1998. Warm-season grasses were particularly responsive to the supplemental irrigation treatments and tended to increase under irrigation at the expense of cool-season grasses. Because of the increased proportion of warm-season grasses, grazed plots were more responsive to irrigation than ungrazed plots.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4003232
    Scopus Count
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    Journal of Range Management, Volume 55, Number 5 (September 2002)

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