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Notes: Comparison of Two Techniques for Measuring Surface Area of Conifer Needles

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Two approaches to estimating surface area of conifer needles were evaluated: an optical projection technique (optical planimeter) focusing light through a plane surface to a photocell, and covering the needle surface with an adhesive and a monolayer of glass beads and measuring weight increase. On 20 clusters of Douglas-fir foliage, the optical planimeter was more precise (95 percent confidence interval 0.6 cm² compared to 2.0 cm²), but the glass-bead method was judged slightly more accurate. However, a needle cross-sectional correction factor introduced to optical planimeter results improved accuracy. Forest Sci. 21:231-232.

Keywords: Optical planimeter; glass-bead technique

Document Type: Miscellaneous

Affiliations: Research Assistant, Coniferous Forest Biome, International Biological Program, Forest Research Laboratory, Oregon State University, Corvallis, Oregon 97331

Publication date: 1975-09-01

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 in forestry

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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