Evaluation of the Interaction of Two Environmental Factors Affecting Douglas-fir Seedling Growth: Light and Nitrogen
Several models of forest growth rely upon an assumption that the environmental factors controlling growth can be treated as multiplicative nonlinear functions. This concept with respect to light and nitrogen was tested by placing Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco] seedlings in subirrigated sand cultures under three light levels (8, 28, and 100 percent full sun) and four levels of nitrogen (2.3, 11, 39, and 77 ppm). Growth increased with increasing light and N, but the low N treatments showed severe chlorosis in the high light treatment. The data, analyzed by ANOVA, linear and nonlinear regression supported these conclusions: (1) growth responded strongly to light and N concentrations, (2) light was the dominant factor, (3) interaction between light and N concentration was measurable and (4) environmental factors can be modeled by multiplicative nonlinear functions. Forest Sci. 29:193-203.
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Keywords: Pseudotsuga menziesii
Document Type: Journal Article
Affiliations: College of Forest Resources, University of Washington, Seattle, WA 98195
Publication date: 1983-03-01
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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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