• Login
    View Item 
    •   Home
    • Journals and Magazines
    • Society for Range Management Journal Archives
    • Rangeland Ecology & Management / Journal of Range Management
    • Journal of Range Management, Volume 57 (2004)
    • Journal of Range Management, Volume 57, Number 6 (November 2004)
    • View Item
    •   Home
    • Journals and Magazines
    • Society for Range Management Journal Archives
    • Rangeland Ecology & Management / Journal of Range Management
    • Journal of Range Management, Volume 57 (2004)
    • Journal of Range Management, Volume 57, Number 6 (November 2004)
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of UA Campus RepositoryCommunitiesTitleAuthorsIssue DateSubmit DateSubjectsPublisherJournalThis CollectionTitleAuthorsIssue DateSubmit DateSubjectsPublisherJournal

    My Account

    LoginRegister

    About

    AboutUA Faculty PublicationsUA DissertationsUA Master's ThesesUA Honors ThesesUA PressUA YearbooksUA CatalogsUA Libraries

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    Stiff Sunflower Population Dynamics on Summer-grazed Sandhills Rangeland

    • CSV
    • RefMan
    • EndNote
    • BibTex
    • RefWorks
    Thumbnail
    Name:
    12496-12472-1-PB.pdf
    Size:
    243.4Kb
    Format:
    PDF
    Download
    Author
    Reece, Patrick E.
    Schacht, Walter H.
    Koehler, Ann E.
    Issue Date
    2004-11-01
    Keywords
    Helianthus rigidus ssp. subrhomboides
    plant size and density
    grazing tolerance
    defoliation characteristics
    summer mortality
    cumulative grazing pressure
    
    Metadata
    Show full item record
    Citation
    Reece, P. E., Schacht, W. H., & Koehler, A. E. (2004). Stiff sunflower population dynamics on summer-grazed sandhills rangeland. Journal of Range Management, 57(6), 590-596.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/643211
    DOI
    10.2111/1551-5028(2004)057[0590:SSPDOS]2.0.CO;2
    10.2307/4004013
    10.2458/azu_jrm_v57i6_reece2
    Additional Links
    https://rangelands.org/
    Abstract
    Thousands of forb species are distributed among the diverse rangelands of North America. However, little is known about livestock grazing effects on the demographics and potential demise of palatable forbs in grassland ecosystems. A study was designed to quantify the cumulative effects of summer grazing on the demographics of stiff sunflower (Helianthus rigidus [Cass.] Desf. spp. subrhomboides [Rydb.] Heiser), a highly palatable, late-seral, perennial forb. Pastures were grazed for 5-7 days in mid-June or mid-July during 1995-1997 at 16, 32, or 48 animal unit days (AUD) per hectare. All grazing treatments reduced the plant height of stiff sunflower. However, population densities were maintained throughout the study at light stocking rates (16 AUD ha-1). In contrast, a single year of heavy stocking (48 AUD ha-1) in June reduced spring stiff sunflower densities 55%. Densities declined about 30% after 1 year at moderate stocking rates (32 AUD ha-1) in either month or heavy stocking in July. After 3 years of short-duration grazing in June, moderate and heavy stocking rates eliminated some colonies and reduced mean pasture densities by about 90% compared with 40% and 70% reductions in moderately and heavily stocked July-grazed pastures, respectively. Reductions in spring densities corresponded to increases in premature senescence the previous year when more than 30% of the plants turned brown before mid-August. Critical levels of premature senescence were likely to occur when more than 60% of stiff sunflower plants within colonies were grazed. Light stocking rates are rare on privately owned Nebraska Sandhills rangeland (4.7 million ha); therefore, vigorous populations of stiff sunflower are most likely to occur in pastures used predominantly during the dormant season.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2111/1551-5028(2004)057[0590:SSPDOS]2.0.CO;2
    Scopus Count
    Collections
    Journal of Range Management, Volume 57, Number 6 (November 2004)

    entitlement

     
    The University of Arizona Libraries | 1510 E. University Blvd. | Tucson, AZ 85721-0055
    Tel 520-621-6442 | repository@u.library.arizona.edu
    DSpace software copyright © 2002-2017  DuraSpace
    Quick Guide | Contact Us | Send Feedback
    Open Repository is a service operated by 
    Atmire NV
     

    Export search results

    The export option will allow you to export the current search results of the entered query to a file. Different formats are available for download. To export the items, click on the button corresponding with the preferred download format.

    By default, clicking on the export buttons will result in a download of the allowed maximum amount of items.

    To select a subset of the search results, click "Selective Export" button and make a selection of the items you want to export. The amount of items that can be exported at once is similarly restricted as the full export.

    After making a selection, click one of the export format buttons. The amount of items that will be exported is indicated in the bubble next to export format.