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Shoot Growth Patterns of Young Loblolly Pine

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Most shoot elongation on Pinus taeda L. seedlings and saplings near Durham, North Carolina, was supplied by the first growth flush, which began about April 1 and ended in mid-May 1967. New growth per shoot declined with distance from the tree top. All leaders had three flushes and half had four. Variation in internode growth was dependent upon growth rate, not length of growth period, which was remarkably uniform among all sampled shoots. Day-to-day shoot growth during the first flush was highly variable. During a 17-day period that accounted for 42 percent of total elongation of the first flush, degree-hour heat sums above 50°F and solar radiation in langleys per day accounted for 93 percent of the variation in total daily growth and 76 percent of the variation in diurnal growth. The effect of temperature was positive, and solar radiation negative. Heat sums alone accounted for 94 percent of the variation in nocturnal growth. The threshold temperature for shoot growth was about 40°F at night, and averaged 50°F during the day. The apparent threshold temperature for diurnal growth increased with increasing intensity of solar radiation. Growth per unit of heat above threshold temperatures was almost the same during the day as at night. Forest Sci. 16:472-482.
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Keywords: Pinus taeda; relative humidity; solar radiation; temperature

Document Type: Journal Article

Affiliations: Principal Silviculturist, Silviculture Laboratory, Southern Forest Exp. Sta., USDA Forest Service, Brewton, Alabama

Publication date: 1970-12-01

More about this publication?
  • 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
    Other SAF Publications
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