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Potential Effect of Stand Structure on Belowground Allocation

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Stand structure affects two key variables that affect biomass allocation to the stem: leaf area and height to the center of the crown. By translating wind forces into a bending moment, these variables generate bending stress within a stem. The uniform-stress axiom of stem formation can be used to calculate current stem mass for a given bending moment and stem allocation for changes in bending moment over a time period. Stem allocation probably affects allocation to fine roots since the stem precedes the root system on the chain of carbohydrate sinks, and total net primary production is a linear function of leaf area. This study indirectly supports this link between stand structure and belowground allocation. A regression model based on the relationship between bending moment and stem allocation explained 98% of the variation in stand-level stem production of a 12-yr-old loblolly pine (Pinus taeda L.) plantation subjected to factorial combinations of irrigation and fertilization. Further-more, relative fine-root allocation was inversely related to relative stem allocation and increases in apparent bending stress. Corresponding associations between bending stress and relative allocation between the stem and fine roots appear to exist for other species, providing additional support for the proposed link. FOR. Sci. 47(1):69–76.
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Keywords: Pinus taeda; carbon allocation; environmental management; fertilization; forest; forest management; forest resources; forestry; forestry research; forestry science; natural resource management; natural resources; uniform-stress axiom

Document Type: Miscellaneous

Affiliations: Associate Professor School of Forestry, Wildlife, and Fisheries, Louisiana Agricultural Experiment Station, Louisiana State University, Agricultural Center, Baton Rouge, LA, Phone: (225) 388-4216; Fax: (225) 388-4216 [email protected]

Publication date: 2001-02-01

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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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