Impact of initial spacing on yield per acre and wood quality of unthinned loblolly pine at age 21

This article is part of a larger document. View the larger document here.

  • Authors: Clark, Alexander, III; Daniels, Richard F.; Jordan, Lewis; Schimleck, Laurie
  • Publication Year: 2010
  • Publication Series: General Technical Report (GTR)
  • Source: In: Stanturf, John A., ed. 2010. Proceedings of the 14th biennial southern silvicultural research conference. Gen. Tech. Rep. SRS–121. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station. 333-337.

Abstract

The market for southern pine first thinnings is soft. Thus, forest managers are planting at wider spacings, and using weed control and fertilization to grow chipping-saw and sawtimber trees in shorter rotations. A 21-year-old unthinned spacing study was sampled to determine the effect of initial spacing on wood quality and yield per acre of planted loblolly pine (Pinus taeda L.). The study area was planted in the Coastal Plain of GA in 1984 with loblolly pine family 7-56 seedlings. Twenty-one trees from each of seven spacings ranging from 6 by 8 feet (908 trees per acre) to 12 by 12 feet (302 trees per acre) were sampled. Total stem green weight per acre of wood and bark to a 3-inch d.o.b top was estimated to be highest in the 6 by 12, 8 by 10 and 8 by 12 foot spacings. Estimated volume of lumber per acre was slightly higher in the 8 by 12 spacing compared to the 12 by 12-feet spacing. Breakeven stumpage price per acre was highest for the trees planted at 8 by 12-feet spacing. Average number of knots, knot diameter, and average maximum knot diameter increased with increased spacing.

  • Citation: Clark III, Alexander; Daniels, Richard F.; Jordan, Lewis; Schimleck, Laurie 2010. Impact of initial spacing on yield per acre and wood quality of unthinned loblolly pine at age 21. In: Stanturf, John A., ed. 2010. Proceedings of the 14th biennial southern silvicultural research conference. Gen. Tech. Rep. SRS–121. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station. 333-337.
  • Posted Date: August 12, 2010
  • Modified Date: October 14, 2010
  • Print Publications Are No Longer Available

    In an ongoing effort to be fiscally responsible, the Southern Research Station (SRS) will no longer produce and distribute hard copies of our publications. Many SRS publications are available at cost via the Government Printing Office (GPO). Electronic versions of publications may be downloaded, printed, and distributed.

    Publication Notes

    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
    • Our online publications are scanned and captured using Adobe Acrobat. During the capture process some typographical errors may occur. Please contact the SRS webmaster if you notice any errors which make this publication unusable.
    • To view this article, download the latest version of Adobe Acrobat Reader.