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Relationship Between Crown Growth and Annual Xylem Sheath Development in Loblolly Pine Saplings

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Xylem development and crown growth of eight 7.5 m tall loblolly pine saplings was followed through one growing season. Periodically induced xylem wounds allowed time-related development of cell and ring dimensions to be determined. Periodic measurement of the leader and all major first-order branches allowed rates and indices of crown growth to be determined. Crown growth and annual ring development were compared in linear regressions to determine effects of crown activity on xylem development. Cell diameter and wall thickness varied directly with a crown growth index expressing a combination of shoot and needle elongation rate, distance between shoots and points on the stem, and cambial age at these points. Ring dimensions appeared dependent on a cumulative expression of shoot and needle growth rate, but no effect related to cambial age was involved at any stem level. Forest Sci. 22:247-260.
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Keywords: Pinus taeda; crown growth rate; crown influence; tracheids

Document Type: Journal Article

Affiliations: Former Assistant Professor of Biometrics, School of Forest Resources, University of Georgia, Athens, Georgia 30602

Publication date: 1976-09-01

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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.
    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
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