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The Influence of Light and Moisture on the Growth of Red Pine Seedlings in Minnesota

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Pinus resinosa Ait. seedlings planted under dense Corylus in northern Minnesota were studied to evaluate the effect of two light levels and three moisture levels on their growth. Precipitation was much above average during the first field season, but slightly below average during the second; no severe drought period was encountered. The elimination of either form of competition improved all aspects of seedling growth, but the removal of competition for light invariably produced a larger growth response than did the removal of competition for moisture. No unshaded seedlings died during the 2-year study, whereas 38 percent of the shaded seedlings died regardless of whether they were trenched or untrenched. Best growth resulted when both forms of competition were eliminated. Dry-matter increase, in particular, was only mediocre if either factor was limiting. A decided interdependence or interaction between the two factors was evident in all facets of growth observed (height growth, size of buds, length and number of needles, stem diameter growth, root growth, and dry-matter production).

Document Type: Journal Article

Affiliations: Research Forester, Pacific Southwest Forest and Range Expt. Sta., Forest Service, U.S. Dept. Agric.

Publication date: June 1, 1967

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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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