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Derivation, Fitting, and Implication of a Compatible Stem Taper-Volume-Weight System for Intensively Managed, Fast Growing Loblolly Pine

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Abstract:

Geometry-oriented methodology yielded a compatible taper-volume-weight system of models whose parameters were estimated using data from intensively managed loblolly pine (Pinus taeda L.) plantations in the lower coastal plain of Georgia. Two segments (separated at a stem ratio of 0.60 of total height) depicted taper, volume, and weight variations of the stems as well. The taper function defines stem taper as a proportion of the diameter at breast height. The segmented volume equation was derived from integration of the taper function along the stem, and it can be readily transformed into a ratio volume equation. Likewise, the segmented weight equation was obtained from integration of the volume function and a wood density function. Data analysis showed that fertilization has significantly reduced taper (inside and outside bark) on the upper segment and augmented stem merchantable volume in this segment. However, unit-weight (green wood and bark, green wood only, and dry wood only) was not significantly different between fertilized and unfertilized trees, implying that annual fertilization did not reduce the specific gravity very much. Finally, our analysis showed no significant impacts of complete vegetation control on taper, volume or weight characteristics. FOR. SCI. 48(3):595–607.

Keywords: Cross-equation correlation of errors; constant form factor; environmental management; forest; forest management; forest resources; forestry; forestry research; forestry science; natural resource management; natural resources; variable form factor

Document Type: Miscellaneous

Affiliations: 1: Research Coordinator D.B. Warnell School of Forest Resources, The University of Georgia, Athens, GA, 30602-2152, Phone: (706) 542-7587; Fax: (706) 542-8356 yzhang@smokey.forestry.uga.edu 2: Professor D.B. Warnell School of Forest Resources, The University of Georgia, Phone: (706) 542-2605 borders@smokey.forestry.uga.edu 3: Professor D.B. Warnell School of Forest Resources, The University of Georgia, Phone: (706) 542-1187 bailey@smokey.forestry.uga.edu

Publication date: August 1, 2002

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
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