Departmental Publications, Forest Resources and Environmental Conservation

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A Comparison of Growth and Yield Prediction Models for Loblolly Pine
Burkhart, Harold E.; Cao, Quang V.; Ware, Kenneth D. (Virginia Tech. Division of Forestry and Wildlife Resources, 1981)
The objective of the study reported here was to analyze published growth and yield systems for loblolly pine, characterizing the nature of the data on which the study was based, specifying what input information is needed, and stating what output estimates and predictions are obtainable. Predicted values from various studies are also compared vis-a-vis those from other investigations, and, where possible, conclusions and recommendations are drawn.
Diameter Distributions and Yields Of Thinned Loblolly Pine Plantations
Cao, Quang V.; Burkhart, Harold E.; Lemin, Ronald C., Jr. (Virginia Tech. Division of Forestry and Wildlife Resources, 1982)
A growth and yield model for thinned loblolly pine plantations was developed using data from 128 0.2-acre permanent plots in the Virginia Piedmont and Coastal Plain. The Weibull function, used to characterize stand diameter distributions, was searched to insure that the resulting total basal area and average dbh estimates were identical to those predicted from stand variables using regression equations. Program WTHIN was written in standard FORTRAN to provide stand and stock tables for thinned old-field loblolly pine plantations. Trials with different thinning intensities indicated reasonable trends, as compared with published studies.