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Studies of Regeneration in Forest Stands Devastated by the Spruce Budworm--IV. Problems of Stocked-Quadrat Sampling

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Data from two nested-quadrat studies of boreal forest species confirm that binomial-or Poisson-based formulations greatly exaggerate apparent percent stocking when data from one quadrat size are converted to a larger or smaller quadrat area. Various workers have independently obtained an expression equivalent to F' = 1 - (1 - F)r, where F and F' are the observed and estimated stocking respectively, and where r is the ratio of the two quadrat areas. Empirical assessment of the exponent r indicates that the simple ratio of quadrat sizes yields too large a value, and regression analysis of the required vs. the theoretical exponents yields (1/2 + 1/2r) as a close approximation for the species examined. The slope of the actual vs. theoretical exponents is proposed as an appropriate functional coefficient of contagion. Stocking is shown to be related to population density of balsam fir seedlings along a rectangular hyperbola. A model of a 3-dimensional relation of stocking, quadrat size, and population density is presented and recommended for interpretation of stocked-quadrat data in forest management.
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Keywords: Abies balsamea; Betula papyrifera; Picea spp; Populus tremuloides; contagious distribution

Document Type: Journal Article

Affiliations: Deps. of Entomology and Zoology, Univ. of Illinois, Urbana

Publication date: 1969-12-01

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.

    2016 Impact Factor: 1.782 (Rank 17/64 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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