Natural Slash Pine
Average diameter at breast height (DBH) is based on basal area and trees per acre. Initial trees per acre, if not specified, is based on age, basal area, and average height. Surviving trees per acre in future years are estimated using age, height, basal area, and previous TPA from Schumacher and Coile (1960). Trees per acre after a thinning are further adjusted using a factor supplied by the Region 8 (Atlanta) office of the U.S. Forest Service. Basal area growth, heights of dominant trees, International 1/4 rule board foot volumes, and cubic foot volumes are estimated using the relationships found in Bennett (1970). Conversions to other log rules, to cords, and to weights are made using the information from Williams and Hopkins (1968).Bennett, F.A. 1970. Variable-density yield tables for managed stands of natural slash pine. U.S. Department of Agriculture, Forest Service, Southeastern Forest Experiment Station, Asheville, NC. Research Note SE-141.
Schumacher, F.X., and T.S. Coile. 1960. Growth and yields of natural stands of the southern pines. T.S. Coile, Inc., Durham, NC. 115 p.
Williams, D.L., and W.C. Hopkins. 1968. Converting factors for southern pine products. Louisiana State University and Agricultural and Mechanical College, Agriculture Experiment Station, Baton Rouge, LA. Bulletin No. 626.