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    • Journal of Range Management, Volume 38 (1985)
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    Seasonal Nitrogen Translocation in Big Bluestem During Drought Conditions

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    Author
    Hayes, D. C.
    Issue Date
    1985-09-01
    Keywords
    rhizomes
    translocation (plant physiology)
    leaves
    roots
    Kansas
    Andropogon gerardii
    drought injury
    nitrogen content
    seasonal variation
    
    Metadata
    Show full item record
    Citation
    Hayes, D. C. (1985). Seasonal nitrogen translocation in big bluestem during drought conditions. Journal of Range Management, 38(5), 406-410.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/645553
    DOI
    10.2307/3899709
    Additional Links
    https://rangelands.org/
    Abstract
    This study, conducted during a severe drought in 1980, assesses the effects of burned and unburned treatments in tallgrass prairie on nitrogen content of big bluestem, Andropogon gerardii Vitman. Seasonal total nitrogen and amino-nitrogen translocations in big bluestem in the tallgrass prairie were studied on burned and unburned treatments within Konza Prairie Research Natural Area, Manhattan, Kans. Leaf total nitrogen dropped from .71% in June 1980 to .21% in November with no significant difference between treatments. Rhizome total nitrogen was significantly different between treatments with a June to November increase of .46% to .86% in unburned and .41% to .82% in burned treatments. Roots averaged 72% of rhizome total nitrogen, indicating that roots are also used as storage organs for nitrogen. Comparisons with other studies conducted in 1980 and 1971-1972 indicate that drought stress may reduce the total nitrogen content of big bluestem. In April 1980, emerging leaves on the unburned plots were significantly higher in amino acid concentration than those on the burned plots. Although leaf amino acid concentration was constant after July, the percent of total nitrogen as amino acids increased 3 to 4 fold from mid-August to October. Rhizome amino acid concentration was significantly higher on the unburned than on burned plots. The September 1980 increase in leaf amino acid concentration and percent of total nitrogen as amino acids indicates a breakdown of protein in aboveground tissue. The concurrent increase in rhizome amino acid concentration and percent of total nitrogen as amino acids supports the concept of fall translocation of nitrogen to the belowground parts which serve as storage organs.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/3899709
    Scopus Count
    Collections
    Journal of Range Management, Volume 38, Number 2 (March 1985)

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