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Needlefall Returns and Resorption Rates of Nutrients in Young Intensively Managed Slash and Loblolly Pine Stands

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Abstract:

Annual needlefall (NF) returns and resorption rates of nutrients in 6-yr-old slash (Pinus elliottii Engelm. var. elliotti,) and loblolly (p. taeda L.) pine stands were investigated using a 2 x 2 x 2 factorial experiment (species, annual fertilization, sustained competition control) in north central Florida. Compared with the reference (untreated), the combination treatment (annual fertilizer plus competition control) increased NF N returns about 6.3-fold (from 2.5 to 15.8 kg ha-1) for slash pine and 13.3-fold (from 1.5 to 19.9 kg ha-1) for loblolly pine. Similar treatment effects were found for P, with recycling rates for loblolly pine greater than for slash pine. Absolute resorption rates of N (from 4.7 to 19.9 kg ha-1 for slash pine; 2.5 to 21.1 kg ha-1 for loblolly pine) and P (from 0.5 to 1.9 kg ha-1 for slash pine; 0.2 to 2.4 kg ha-1 for loblolly pine) increased for both species as management intensity increased (i.e., cultural treatments; reference vs. fertilizer plus competition control). However, specific resorption rates of N and P were lowest for fertilizer treatments. When averaged over all cultural treatments, slash pine resorbed more N (62 vs. 57%) and P (62 vs. 51%) than loblolly pine; approximately 26% of the annual P requirements for slash pine were met by reabsorption compared with 13% for loblolly pine. Nutrient pool size within the plant (uptake) and annual nutrient demands for growth were dominant factors influencing the nature and extent of N and P resorption for both pine species. For. Sci. 40(4):650-662.

Keywords: Fertilization; P. taeda; Pinus elliottii; competition control; nitrogen; nutrient retranslocation; phosphorus

Document Type: Journal Article

Affiliations: Associate Professor, School of Forest Resources and Conservation, University of Florida, Gainesville, FL 32611-0303

Publication date: 1994-11-01

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.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 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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