rdf-syntax-grammar
mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    title: Mechanisms of persistence and species replacement in populations of Bouteloua curtipendula with contrasting grazing histories
  name:
    name part: Hendrickson, John Russell
    name part: 1961-
    role:
      role term: creator
  type of resource: text
  genre: bibliography
  origin info:
    place:
      place term: xx
    date issued: 1996
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: print
    extent: x, 103 leaves : illustrations ; 28 cm.
  abstract: A series of experiments were conducted with two perennial grasses to evaluate the contribution of persistence mechanisms and the impact of selective defoliation on species replacement in three communities with contrasting grazing histories on the Edwards Plateau, Texas. The communities had either been ungrazed, moderate-rotationally grazed or continuous-intensively grazed by domestic livestock since 1948. Sixty Bouteloua curtipendula plants in each of these three communities were randomly assigned to four treatments, including a non-defoliated control, to evaluate the impact of selective defoliation. Reproductive tillers of the late seral species, B. curtipendula, and the mid-seral species, Hilaria belangeri, were permanently marked in the ungrazed and intensively grazed communities in June 1993 and destructively harvested in October 1993, May and October 1994 and May 1995. Maximum axillary bud longevity was 23 months which exceeded seed longevity by 1.5 to 2 times in R curtipendula and the longevity of axillary buds in the late seral species was six months longer than in the mid-seral species. However, the contribution of dormant axillary buds to persistence was minimized by low tiller initiation (<10%). Modifications in population structure induced by long-term grazing suppressed plant and tiller demographic responses more than short-term defoliation. B. curtipendula had a higher density of smaller plants in the intensively grazed community, compared to low densities of larger plants in the ungrazed and moderately grazed communities. Selective defoliation did not affect B. curtipendula tiller variables in any community and tiller per tiller recruitment and mortality rates were comparable between communities. Still, cumulative tiller recruitment of B. curtipendula in the intensively grazed community was 44% of that in the ungrazed community because of high plant mortality (50%). The minimal response of plant variables to short-term defoliation in the intensively gr…
  note: by John Russell Henrickson.
  note: Vita.
  note: "Major Subject: Rangeland Ecology and Management".
  note: Issued also on microfiche from University Microfilms Inc.
  note: Includes bibliographical references: pages 86-98.
  note: Ph. D. Texas A&M University 1996.
  subject:
    topic: Major rangeland and ecology management
  identifier: 97-01646 UMI
  identifier: http://proxy.library.tamu.edu/login
  related item:
    location:
      url: http://proxy.library.tamu.edu/login
  record info:
    record content source: TXA
    record creation date: 970501
    record change date: 20190325093255.0
    record identifier: in00001345696