A New Competition Model for Individual Trees

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The model represents mathematically competitive interaction between individual trees. It consists of two basic components: (1) the influence zone of each tree (which is a function of its size) and (2) the amount and nature of interaction (which depends on the distance between and relative size of the competing tree and its competitors and also on a power of relative tree sizes). Optimum model parameters were obtained by iterative procedures on a computer, combined with regression analyses for pure, even-aged, fully stocked stands of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco), jack pine (Pinus banksiana Lamb.), red pine (P. resinosa Ait.), and aspen (Populus tremuloides Michx.) and for an even-aged stand of Eucalyptus spp. growing at a range of stand densities. The model satisfactorily described competition effect for the five stands studied and accounted for a greater portion of variation in tree growth than some of the earlier competition indices. Forest Sci. 17:364-372.

Keywords: Tree growth; stand density

Document Type: Journal Article

Affiliations: Mensurationist, Canadian Forestry Service, Edmonton, Alberta

Publication date: September 1, 1971

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  • 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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