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    • Journal of Range Management, Volume 55 (2002)
    • Journal of Range Management, Volume 55, Number 3 (May 2002)
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    Evaluation of a technique for measuring canopy volume of shrubs

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    Author
    Thorne, M. S.
    Skinner, Q. D.
    Smith, M. A.
    Rodgers, J. D.
    Laycock, W. A.
    Cerekci, S. A.
    Issue Date
    2002-05-01
    Keywords
    sample size
    salix planifolia
    Salix
    volume determination
    estimation
    sampling
    plant communities
    shrubs
    canopy
    plant height
    willow (Salix spp.)
    measurement variability
    sampling techniques
    sample size
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    Citation
    Thorne, M. S., Skinner, Q. D., Smith, M. A., Rodgers, J. D., Laycock, W. A., & Cerekci, S. A. (2002). Evaluation of a technique for measuring canopy volume of shrubs. Journal of Range Management, 55(3), 235-241.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/643653
    DOI
    10.2307/4003129
    10.2458/azu_jrm_v55i3_thorne
    Additional Links
    https://rangelands.org/
    Abstract
    Cover methods quantify vegetative communities in only 2 dimensions. The addition of height measurements to cover data, resulting in canopy volume estimates, provide a more practical level of description for shrub communities. We evaluated a technique to estimate canopy volume of shrubs that used a formula [2/3piH (A/2 x B/2)] derived from the basic ellipsoid volume formula. Objectives of this study were to determine if there were significant differences among means of repeated observations on sample units: (1) among observers; (2) within observers; and (3) between sample periods when using this technique. At 2 locations in Wyoming, 10 planeleaf willow (Salix planifolia var. planifolia Pursh) plants along each of 5 randomly established transects were sampled during 2 consecutive periods by 4 observers. Differences among observers were significant at both sites (P < 0.05). However, within observer variation between sample periods was not significant (P > 0.05) at either site. Mean canopy volume did not vary significantly (P > 0.05) between sample periods when averaged across observers. Estimated sample sizes ranged between 2 and 31 transects depending on the desired sampling precision and confidence level. The average time per transect among all observers decreased from 13 minutes (SD = 3.7) in sample period 1 to 9 minutes (SD = 1.3) in sample period 2. Using this method, managers can better describe and monitor trends in the structural diversity of shrub communities. This canopy volume technique can be applied with minimal training and is precise, efficient, and repeatable.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4003129
    Scopus Count
    Collections
    Journal of Range Management, Volume 55, Number 3 (May 2002)

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