Publication Information

Title:	Growth and Yield in Managed Natural Stands of Loblolly and Shortleaf Pine in the West GuIf Coastal Plain
Author(s):	Burton, J.D.
Date:	1980
Source:	Res. Pap. SO-159. New Orleans, LA: U.S. Department of Agriculture, Forest Service, Southern Forest Experiment Station. 12 p.
Station ID:	RP-SO-159
Description:	Second-growth even-aged loblolly-shortleaf pine stands on good and medium sites were thinned from above or below to a basal area of 70 ft², 85 ft², and 100 ft²/acre, to an increasing basal area, or according to the judgment of a committee. Treatments began at age 20 for original plots and at age 25 for supplementary plots (on good sites only), which were thinned to a basal area of 55ft², 115 ft², or 130 ft²/acre.Stands were thinned every 5 years. At age 45, most trees in good-site original plots and supplementary plots thinned from below were in the l0-inch d.b.h. class and larger. In the 70-ft², 85-ftk,and "increasing" treatments, most stems were in the 15-inchclass and larger. On good-site original plots thinned from below, at 45 years standing sawtimber volume for trees (>,=)9.6 inches d.b.h. containing (>,=) one 16-ft log to an 8-inchtop was greatest in "increasing" treatment plots and least in 85-ft²and 100-ft²/acre plots. In supplementary plots, standing board-foot volume was greatest in 130-ft² and least in 55-ft²/acreplots. On medium sites, standing volume was greatest in "judgment" and l00ft and least in 70 ft²/acreplots. Sawtimber m.a.i. was still increasing rapidly at age 45 in all treatments. Cubic-foot m.a.i. was increasing slowly on medium sites but declining in supplementary plots and in all good-site original plots except the 70-ft" and "increasing" treatments. On good sites, p.a.g. in board feet culminated between ages 30 and 35 in the 70-ft²/ and 85.ft² treatments and between ages 40 and 45 in "increasing" plots. On medium sites, p.a.g. apparently was still increasing at 45 years. On both sites, sawtimber ingrowthwas much less complete at age 45 in thin-from-above stands than in those thinned from below. On good sites, sawtimber yield to age 45 in plots thinned from below was greatest in "increasing" treatment plots and least in l00- ft²/acre stands. In supplementary plots, sawtimber yield was greatest in 55-ft² and least in 115-ft²/acre treatments. On medium sites, sawtimber yield was greatest in "judgment" and l00ft and least in 70-ft²/acre stands. On good sites, cubic-foot yield to age 45, in peeled stemwoodto a 3-inch d.i.b., trees (>,=) 3.6 inches d.b.h., in plots thinned from elow,was greatest for "increasing" treatment plots and least for 70-ft² stands. In supplementary plots, cubic-foot yield was greatest for 130-ft² and least for 55-ft² /acre plots. On medium sites, cubic-foot yield was greatest for 100.ft²and least for 70-ft²/acre stands.
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