Abstract
A computer program to simulate spatial distribution of hard wood rootstock populations is presented. Nineteen 3 to 6 year- old loblolly pine (Pinus taeda L.) plantations in Alabama and Georgia were measured to provide information for the simula tor. Spatial pattern, expressed as Pielou's nonrandomness index (PNI), ranged from 0.47 to 2.45. Scatterplots illustrated no rela tionship between pattern, species relative density, site prepara tion, or stand age.
Newnham's point pattern generator was modified to reduce execution time. Equations to predict program inputs as a func tion of PNI and desired number of points were developed for uniform, random, and randomly clumped populations. Total rootstock height distribution was fitted using a two-parameter, left- and right-truncated Weibull function. Crown area was de termined conditionally by total rootstock height. The simulator may be used to generate populations for evaluating different sampling methods for hardwood rootstock attributes or in in dividual tree growth and yield models.
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