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Development of the Shoot System of Young Loblolly Pine II. Dry Matter and Nitrogen Accumulation

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Patterns of dry matter and N accumulation of the various parts of the shoot system of loblolly pine were characterized during the fifth year of the tree's development. The first of four flushes accumulated the most dry matter. The entire tree increased in mass throughout the year, and stem and foliage made the largest gains among the parts. The foliage mass doubled even though all the older foliage was lost during the year. Most of the branch accumulation was in the middle crown. During the calendar year, three different N accumulation rates were exhibited by the trees, the highest rate occurring between mid-August and October. Nitrogen accumulation generally paralleled foliar development, i.e., production of current foliage and the loss of older foliage. In contrast to other tissues, foliage accumulated N continuously. This continuity of accumulation was, in part, apparently maintained by transfer from other tree tissues. Net accumulation within individual trees was 7.6 g of N and 2.1 kg of dry matter. For the entire plantation this amounted to 34.1 and 9,400 kg/ha of N and dry matter, respectively. Forest Sci. 17:55-62.
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Keywords: Biomass; foliar analysis; phenology

Document Type: Journal Article

Affiliations: Forester, Miss. Agr. Exp. Sta., State College

Publication date: 1971-03-01

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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