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Estimating Defoliation Using Stratified Point Intercept Sampling

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Abstract:

A method of estimating percent defoliation is presented whereby foliage measurements are taken on a plot using a sighting tube and compared to foliage present at the same points on the same plot in a base year. Since measurements are not independent, a nonparametric procedure using McNemar's statistic is used to estimate percent defoliation and its standard error. Percent defoliation is estimated for an entire plot by dividing the plot into canopy height categories. An example is provided. For. Sci. 33(1): 157-163.

Keywords: McNemar's test; Sighting tube; contingency table; gypsy moth

Document Type: Journal Article

Affiliations: Professor, Forest Arthropod Research Team, Division of Forestry, West Virginia University, Morgantown, WV 26506

Publication date: March 1, 1987

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.

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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