A weighted least squares diameter moment recovery system for cut over site prepared loblolly pine plantations

摘要

The components and structure of a thinned/unthinned growth and yield simulator for planted loblolly pine (Pinus taeda L.) on cutover site-prepared land developed by the MSU Growth and Yield Cooperative are described. Prior to the tirst thinning, a three-parameter Wiebull diameter distribution recovery system supported on stand minimum, and arithmetic, and quadratic mean diameters is employed. At the first thinning, or if an initial tree list is supplied as input, a parameter-free least squares adjustment diameter moment recovery system is applied to allocate mortality and diameter growth to the elements of the tree list. Because thinning from below can be considered essentially equivalent to heavy competition mortality, the parameter-free mortalityallocation procedure is adapted for allocating thinned trees to the before thinning tree list. Copies of a PC-compatible implementation of the model can be obtained by writing to the authors.