. Research for tomorrow's forests : 1983 research accomplishments. --. Forests and forestry Research United States. New Guides Improve Thinning of Shortleaf Pine Immature shortleaf pine stands must be thinned to grow large-diameter trees quickly. Traditionally, how much you thin depends on basal area (the total cross-sectional area of all trees on an acre). Basal area alone, though, is not a good indicator of stand stocking (number of trees in a stand), and thin- nings controlled by basal area may often leave a stand understocked. When crop tree thinnings are made, the number and spacing of cr
. Research for tomorrow's forests : 1983 research accomplishments. --. Forests and forestry Research United States. New Guides Improve Thinning of Shortleaf Pine Immature shortleaf pine stands must be thinned to grow large-diameter trees quickly. Traditionally, how much you thin depends on basal area (the total cross-sectional area of all trees on an acre). Basal area alone, though, is not a good indicator of stand stocking (number of trees in a stand), and thin- nings controlled by basal area may often leave a stand understocked. When crop tree thinnings are made, the number and spacing of crop trees are often selected without regard for future stand stocking. Thinning guides for shortleaf pine, recently developed by North Central Station scientists, provide managers with a new and effective tool to control thinnings. The guides are in the form of stocking charts that graphically de- fine the relationships among basal area, number of trees, and the diameter of the tree of average basal area. The guides are based on research that de- fined the growing space requirements of shortleaf pine and are independent of stand age and site quality. The format used for the background chart was pre- viously described in Agriculture Hand- book 355, "Even-Aged Silviculture for Upland Central Hardwoods," and has recently been adopted for use through- out the National Forest This 30-year-old stand was thinned according to the growing space it needs and will grow about a cord per acre per year in the next decade. 33. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Forest Service. [Washington, D. C. ?] : USDA, Forest Service
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