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Sampling the Density of Tree Species with Quadrats in a Species-Rich Tropical Forest

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The statistical efficiencies of three quadrat sizes (10 X 20 m, 10 X 40 m, and 20 X 40 m) were evaluated in the species-rich tropical forest on Barro Colorado Island, Panama Canal Zone. The 10 X 20-m quadrat required the lowest percent sample to adequately estimate the density for the majority of species tested. The fewer the number of individuals and the greater the degree of aggregation, the larger the required sample for density estimation. A 45 to 50 percent sample was needed to estimate the density of the more common species with 80 percent confidence and 20 percent error. Some implications of the results for phytosociological analyses of species-rich forest are discussed. Forest Sci. 17:395-400.

Document Type: Journal Article

Affiliations: Assoc. Professor, Dep of Statistics, University of Wyoming

Publication date: September 1, 1971

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.
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