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Full-Text Articles in Life Sciences
Compatible Stem Taper And Total Tree Volume Equations For Loblolly Pine Plantations In Southeastern Arkansas, C. Vanderschaaf
Compatible Stem Taper And Total Tree Volume Equations For Loblolly Pine Plantations In Southeastern Arkansas, C. Vanderschaaf
Journal of the Arkansas Academy of Science
A system of equations was used to produce compatible outside-bark stem taper and total tree volume equations for loblolly pine (Pinus taeda L.) plantations in southeastern Arkansas. Paired height diameter stem measurements were obtained from trees located in one 45-year-old unthinned plantation. After fitting and integrating the stem taper equation to total tree height, an individual tree constant form factor volume equation was obtained. The stem taper equation can also be integrated to any merchantable height to obtain merchantable volume. To see how the constant form factor volume equation predicts outside bark volume for trees vastly different than those used …
Historical Forest Landscape Changes In The Buffalo River Sub-Basin In Arkansas, Robert C. Weih Jr., A. Dick
Historical Forest Landscape Changes In The Buffalo River Sub-Basin In Arkansas, Robert C. Weih Jr., A. Dick
Journal of the Arkansas Academy of Science
Forested areas in the United States have been altered since the time of European settlement. For this reason, research interests have increased in comparing present day vegetation with that of the preEuroamerican era to see what changes, if any, have occurred in some of our more outstanding natural areas. Such studies have been conducted in other parts of the United States but limited research has been done in Arkansas. The General Land Office (GLO) surveys of Arkansas were originally conducted between approximately 1815 and 1850 shortly after Arkansas was acquired from France by means of the Louisiana Purchase and provides …
Comparison Of Pine Height Models For The Crossett Experimental Forest, Don C. Bragg
Comparison Of Pine Height Models For The Crossett Experimental Forest, Don C. Bragg
Journal of the Arkansas Academy of Science
Many models to predict tree height from diameter have been developed, but not all are equally useful. This study compared a set of height-diameter models for loblolly (Pinus taeda) and shortleaf (Pinus echinata) pines from Ashley County, Arkansas. Almost 560 trees ranging in diameter at breast height (DBH) from 0.3 cm (both species) to 91.9 cm (for shortleaf) or 108.2 cm (for loblolly) were chosen for measurement. Height equations were then fit to four different functions (Chapman-Richards, modified logistic, exponential, and Curtis-Arney) with weighted nonlinear least squares regression using DBH as the only predictor. Models were evaluated using a series …