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Competition Ratio Dynamics for Improved Mortality Estimates in Simulated Growth of Forest Stands

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A competition ratio, R, is shown to be a measure of tree vigor and an alternative to crown class in simulated forest growth studies. R is the proportion of a tree's competitive influence zone overlapped by the zone of the average competing tree. Trees with R < 0.23 emulate seasonal growth patterns of dominant trees, and with R > 0.40 the patterns of suppressed trees. R, like crown class, is dynamic and is considered here as a finite Markov process. Transitional probability matrices based on samples of over 1700 trees are presented for 4- and 6-yr periods. Tests using independent data from six ΒΌ acre (0.10 ha) plots indicate these matrices over-estimate mortality rates. Nevertheless, knowledge of a tree's current R-class and its probability of change can lead to improved estimates of periodic mortality in simulated pine plantations. Forest Sci. 21:46-51.
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Keywords: Markov process; mathematical models

Document Type: Journal Article

Affiliations: Forester, International Paper Company, Panama City, Florida

Publication date: 1975-03-01

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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