Natural Loblolly Pine
This simulator projects the growth and yield of a stand table. So, the user can enter a stand table, or the user can simply enter the total trees per acre for the stand, or simply a basal area. If there is no indication of the trees per acre by the user, total trees per acre are estimated using methods described in Burk and Burkhart (1984). Further, for these latter two cases, a stand table is then developed using a Weibull distribution. Total basal area is projected as a function of harvest, age, prior basal area, and site index, from relationships in Sullivan and Clutter (1972). The stand table is projected using methods derived from Clutter and Jones (1980). When projected, survival of trees is estimated using methods described in Schumacher and Coile (1960). Dominant heights of trees for each diameter class are estimated using methods described in Farrar (1973) and a correction factor from Coile and Schumacher (1953). Volumes and weights are calculated using relationships from Clutter and Jones (1980), Burkhart et al. (1972), and Burkhart (1977).Burk, T.E., and H.E. Burkhart. 1984. Diameter distributions and yields of natural stands of loblolly pine. Virginia Polytechnic Institute and State University, School of Forestry and Wildlife Resources, Blacksburg, VA. Publication No. FWS-1-84.
Burkhart, H.E. 1977. Cubic foot volume of loblolly pine to any merchantable top limit. Southern Journal of Applied Forestry. 1(2): 7-9.
Burkhart, H.E., R.C. Parker, and R.G. Oderwald. 1972. Yields for natural stands of loblolly pine. Virginia Polytechnic Institute and State University, Division of Forestry and Wildlife Resources, Blacksburg, VA. Publication No. FWS-2-72.
Clutter, J.L., and E.P. Jones. 1980. Prediction of growth after thinning in old-field slash pine plantations U.S. Department of Agriculture, Forest Service, Southeastern Forest Experiment Station, Asheville, NC. Research Paper SE-217. 19 p.
Coile, T.S., and F.X. Schumacher. 1953. Site index of young stands of loblolly and shortleaf pines in the Piedmont Plateau region. Journal of Forestry. 51(6): 432-435.
Farrar, R.M., Jr. 1973. Southern pine site index equations. Journal of Forestry. 71(11): 696–697.
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.
Sullivan, A.D., and J.L. Clutter. 1972. A simultaneous growth and yield model for loblolly pine. Forest Science. 18(1): 76-86.