Natural Longleaf Pine
Average height of dominant trees is based on site index, age, and base age (50 years for natural stands). Four constants are necessary to estimate average height, and are derived from the publication noted below. Average diameter at breast height (DBH) is based on stand age and site index. Basal area growth is based on current basal area, initial stand age, and projected stand age. Total cubic foot volume per acre is based on initial stand age, projected stand age, basal area, and site index. This value, along with site index, basal area, and age are used to estimate cords per acre, board feet per acre, and weight per acre. The simulator then converts estimates of board feet per acre between board foot rules (Doyle, Scribner, International 1/4 rule).The volume and growth relationships for the natural longleaf pine simulator are based on the following work:
Farrar, R.M. Jr. 1979. Growth and yield predictions for thinned stands of even-aged natural longleaf pine. U.S. Department of Agriculture, Southern Forest Experiment Station, New Orleans, LA. Research Paper SO-156. 78 p.