Abstract
A system of prediction equations was developed to examine the effects of interspecific competition on diameter distributions for young loblolly pine ( Pinus taeda L.) plantations in the piedmont of Georgia, USA. Very little difference was detected among three types of models to predict the effects of hardwoods and total vegetation control on quadratic mean diameter (15 cm agove ground level). The percentile-based parameter recovery system for a three-parameter Weibull distribution function included direct and indirect effects of competition. Diameter distributions were compared among specific site preparation treatments and by systematically varying the amount of one hardwood species. The effects of increasing interspecific competition included skewing the distributions toward smaller diameters, decreasing the variation in diameters, and increasing the coefficient of variation in diameters. The system was sensitive to differences in interspecific competition at early ages, and could be adapted to young plantations of other commercial species.
Published Version
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