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Stand Structure and Yield Relationships in a 20-Year-Old Loblolly Pine Spacing Study

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A loblolly pine (Pinus taeda L.) spacing study on a Piedmont site (SI 75, base age 25) had at age 20 a maximum yield of 49 cords per acre with a near maximum basal area of 187 square feet at a spacing of 8 x 8 feet. Comparative yields on the other spacings tested were: 6 x 6, 188 ft² and 43 cords; 10 x 10, 166 ft² and 45 cords; 12 x 12, 152 ft² and 43 cords. Sawtimber volume in trees larger than 9.5 inches in diameter rose from zero at 6 x 6 feet to almost 10,000 board feet per acre at 12 x 12 feet. Survival on the 6 x 6 plots was 71 percent; 8 x 8, 87 percent; 10 by 10, 92 percent; and 12 x 12, 93 percent.

Document Type: Journal Article

Affiliations: Research Forester, USDA Forest Service, Southeastern Forest Experiment Station, Forestry Sciences Laboratory, Charleston, South Carolina

Publication date: 1981-08-01

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  • Each regional journal of applied forestry focuses on research, practice, and techniques targeted to foresters and allied professionals in specific regions of the United States and Canada. The Southern Journal of Applied Forestry covers an area from Virginia and Kentucky south to as far west as Oklahoma and east Texas.
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