Upland Oak Hickory
Average diameter at breast height (DBH) is based on stand age and site index. Initial trees per acre, if not specified, is based on basal area and average DBH. Basal area growth is based on current basal area, site index, initial stand age, and projected stand age. Changes in trees per acre are based on estimates of ingrowth and mortality, which are a function of stand age, site index, and trees per acre. Beginning with a simulation of cubic foot volume, this simulator estimates cords per acre, board feet per acre (International 1/4 rule), and weight per acre (total weight and sawtimber weight), which are based on site index, age, average DBH, and basal area. The simulator then converts the estimate of board feet per acre to other board foot rules (Doyle, Scribner).The volume and growth relationships for the oak-hickory simulator are based on the following two works:
Dale, M.E. 1972. Growth and yield predictions for upland oak stands, 10 years after initial thinning. U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station, Upper Darby, PA. Research Paper NE-241.
Perkey, A.W. 1985. Computer corner: Groak (Grow Oak) on a computer. Northern Journal of Applied Forestry. 2(4): 99.
In this simulator the height of trees is only used for reporting purposes. The dominant height computations are based on age and site index. The original source and the substitute equation for southeastern oaks types are:
Schnur, G.L. 1937. Yield, stand, and volume tables for even-aged upland oak forests. U.S. Department of Agriculture, Washington, D.C. Technical Bulletin 560.
Olsen, D.J. Jr. 1959. Site index curves for upland oak in the southeast. U.S. Department of Agriculture, Forest Service, Southeastern Forest Experiment Station, Asheville, NC. Research Note Number 125.