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    Author(s): Rodney E. Will; Greg Barron-Gafford; Robert O. Teskey; Barry D. Shiver
    Date: 2004
    Source: Gen. Tech. Rep. SRS–71. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station. pp. 407-410
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (233 KB)

    Description

    Mid-summer foliar nitrogen concentrations (N) were measured at three canopy positions (upper, middle, lower), two foliage ages per canopy position (current-year and 1-year-old), and two flushes per age class (first flush and second flush) in 4-year-old loblolly (Pinus taeda L.) and slash pine (Pinus elliottii Engelm.) stands planted at 740, 2,220, and 3,700 trees ha-1 to (1) determine differences in foliar N due to species and planting density, (2) quantify variability within canopies, and (3) determine what factors are important to consider when making comparisons between stands with different canopy structures. Overall, foliar N was greater for loblolly pine than slash pine (11.9 vs. 10.1 mg g-1) and decreased with stand density (12.2, 10.7, and 10.1 mg g-1 for stands with 740, 2,220, and 3,700 trees ha -1 respectively). Foliar N of current-year foliage (11.9 mg g-1) was greater than 1-year-old foliage (10.2 mg g-1). Several interactions occurred between factors of interest due to changes in the magnitude of differences, not due to changes in the direction of response.

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    Citation

    Will, Rodney E.; Barron-Gafford, Greg; Teskey, Robert O.; Shiver, Barry D. 2004. Within and Between Canopy Variabilit of Foliar Nitrogen Concentration for Loblolly and Slash Pine Stands Planted at Different Densities. Gen. Tech. Rep. SRS–71. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station. pp. 407-410

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