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Departmental Publications, Forest Resources and Environmental Conservation

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https://hdl.handle.net/10919/23968
Newsletters, annual reports, and other departmental publications

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Browsing Departmental Publications, Forest Resources and Environmental Conservation by Author "Burk, Thomas E."

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    Diameter Distributions and Yields of Natural Stands of Loblolly Pine
    Burk, Thomas E.; Burkhart, Harold E. (Virginia Tech. Division of Forestry and Wildlife Resources, 1984)
    A diameter distribution yield model was developed based upon measurements of 117 0.1-acre temporary plots located in naturally regenerated loblolly pine stands in the Piedmont and Coastal Plain of Virginia and the Coastal Plain of North Carolina. Diameter distributions were derived using the Weibull density function by requiring that the distribution's arithmetic and quadratic means matched those predicted from stand-level attributes using regression equations. Software was written in FORTRAN and BASIC implementing the model and an existing basal area projection equation. Stand and stock tables are presented for 30-year projections from age 20 for various combinations of site index and initial basal area.
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    Growth and Yield of Appalachian Mixed Hardwoods After Thinning
    Harrison, Wade C.; Burkhart, Harold E.; Burk, Thomas E.; Beck, Donald E. (Virginia Tech. Division of Forestry and Wildlife Resources, 1986)
    G-HAT (Growth of Hardwoods After Thinning) is a system of computer programs used to predict growth and yield of Appalachian mixed hardwoods after thinning. Given a tree list or stand table, along with inputs of stand age, site index, and stand basal area before thinning, G-HAT software uses species-specific individual tree equations to predict tree basal area increment and total height for the residual stand. Cubic foot volumes, based on desired merchantability standards, may be obtained for thinned trees, the residual stand, and the projected stand. G-HAT is available as a self-contained, interactive program (BASIC G-HAT) or as a library of FORTRAN subroutines (FORTRAN G-HAT). BASIC G-HAT, for personal computers, is designed for interactive, user-friendly sessions with keyboard input and screen output. Its use requires no programming ability. FORTRAN G-HAT is compatible with mainframe computers, minicomputers, and personal computers. It consists of modular subroutines which allow considerable flexibility in application, such as interface with computerized timber inventory systems and stand simulators.