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    • Rangeland Ecology & Management, Volume 60 (2007)
    • Rangeland Ecology & Management, Volume 60, Number 4 (July 2007)
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    A Basis for Relative Growth Rate Differences Between Native and Invasive Forb Seedlings

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    Author
    James, Jeremy J.
    Drenovsky, Rebecca E.
    Issue Date
    2007-07-01
    Keywords
    nutrients
    specific leaf area
    weeds
    yarrow
    
    Metadata
    Show full item record
    Citation
    James, J. J., & Drenovsky, R. E. (2007). A basis for relative growth rate differences between native and invasive forb seedlings. Rangeland Ecology & Management, 60(4), 395-400.
    Publisher
    Society for Range Management
    Journal
    Rangeland Ecology & Management
    URI
    http://hdl.handle.net/10150/643171
    DOI
    10.2111/1551-5028(2007)60[395:ABFRGR]2.0.CO;2
    Additional Links
    https://rangelands.org/
    Abstract
    The ability of invasive plants to achieve higher relative growth rates (RGR) than their native counterparts has been widely documented. However, the mechanisms allowing invasives to achieve higher RGR are poorly understood. The objective of this study was to determine the basis for RGR differences between native and invasive forbs that have widely invaded nutrient-poor soils of the Intermountain West. Six native and 6 invasive forbs were seeded in pots in a greenhouse, and 4 harvests were conducted over a 2-month period. These 4 harvests were used to calculate RGR and the components of RGR, net assimilation rate (rate of dry matter production per unit leaf area), leaf area ratio (LAR, leaf area per unit total plant mass), leaf mass ratio (the proportion of biomass allocated to leaves), and specific leaf area (SLA, leaf area per unit leaf biomass). Mean RGR of the 12 study species ranged between 0.04 and 0.15 g g-1 d-1 but was significantly higher for invasive forbs compared to native forbs (P = 0.036). The higher RGR achieved by invasive forbs was due mainly to a greater SLA and LAR. This indicates that invasive forbs achieved higher RGR than natives primarily by creating more leaf area per unit leaf mass, not by allocating more biomass to leaf tissue or by having a higher net rate of dry matter production. A high degree of variation in RGR, SLA, and LAR was observed in native forbs, suggesting that the ability to design weed-resistant plant communities may be improved by managing for specific functional traits as opposed to functional groups. 
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2111/1551-5028(2007)60[395:ABFRGR]2.0.CO;2
    Scopus Count
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    Rangeland Ecology & Management, Volume 60, Number 4 (July 2007)

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