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    • Journal of Range Management, Volume 44 (1991)
    • Journal of Range Management, Volume 44, Number 3 (May 1991)
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    Correcting estimates of net primary production: Are we overestimating plant production in rangelands?

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    Author
    Biondini, M. E.
    Lauenroth, W. K.
    Sala, O. E.
    Issue Date
    1991-05-01
    Keywords
    computer software
    errors
    estimation
    productivity
    biomass production
    range management
    
    Metadata
    Show full item record
    Citation
    Biondini, M. E., Lauenroth, W. K., & Sala, O. E. (1991). Correcting estimates of net primary production: Are we overestimating plant production in rangelands?. Journal of Range Management, 44(3), 194-198.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/644685
    DOI
    10.2307/4002939
    Additional Links
    https://rangelands.org/
    Abstract
    This paper addresses the issue of the effect of random errors in field estimates of net primary production (NPP). This is a critical subject in range management because field estimates of plant production are regularly used to determine stocking rates, range condition, and animal consumption. What we show in this paper is that random errors associated with field estimates of NPP can result in a positive bias and thus an overestimation of NPP. Depending on the case, this overestimation has been reported as high as 700%. We present examples with overestimations in the 200% to 400% range. The overestimation in NPP increases with increases in biomass variances, frequency of sampling, and number of taxonomic (species) and tissue (live, dead, etc) components sampled. We (1) outline in nonmathematical terms the reasons behind overestimation in NPP and the analytical solutions designed to correct them; and (2) present applications of the analytical solution for adjustments to concrete cases. The adjustments for overestimation outlined in this paper do not guarantee an accurate estimate of NPP but eliminate an unneeded source of error. A computer program (for IBM(TM) compatible) designed to implement the necessary adjustments is available from the authors free of charge (send a blank diskette).
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4002939
    Scopus Count
    Collections
    Journal of Range Management, Volume 44, Number 3 (May 1991)

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