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Title: Measuring crown dynamics of longleaf pine in the sandhills of Eglin Air Force Base

Author: Anderson, Matt; Somers, Greg L.; Smith, W. Rick; Freeland, Mickey; Ruth, Donna;

Date: 1998

Source: Proceedings of the 2nd Longleaf Alliance Conference; 1998 Novezzer 17-19; Charleston, SC. Longleaf Alliance Report No. 4. Longleaf. Alliance: 46-48. Auburn University, AL;

Publication Series: Miscellaneous Publication

Description: The USDA Forest Service SRS, in cooperation with Auburn University, is developing an individual tree, spatially explicit, and btoiogicaily based growth model for natural iongieaf pine sands at Eglin Air Force Base in Florida. The goal of the growth model is to provide a tool for the land managers to compare silvicultural practices effects on the light and water environment In addition to stand structure of the trees. Individual trees are being selected within 3 site classes at Egiin, to fit a predetermined matrix of tree height, diameter, and crown ratio. The field data taken on each selected tree includes stem taper on the subject tree and location relative to the subject tree, species, size, and crown dimensions on competitors. Branches and the top of the subject tree are then lowered to the ground before the stem is cut. The stem is then cut into sections and brought back to Auburn for reconstruction. Complete crown architecture for the past three years is measured by reattaching the branches to the stem sections within a three dimensional grid. DISC samples are collected at 1-meter intervals along the stem for measurements of heartwood and sapwood relationships, tree ring growth, and dry wood density. In the fietd, every fourth branch is selected to be a sample branch from which fresh needles are removed within every meter out from the stem to determine weight, density length, and nitrogen content. Branch dii are also taken at the base of every sample branch after crown architecture to determine sapwood, branch radial growth, and wood density. Over 50 trees have been finished so far ranging in diameter from seedlings just out of the grass stage to mature trees over 30 cm in diameter. Other factors such as light penetration through the crown and soil nutrients and water holding capacity are still in the planning stages. Another 1.5 years of data collection will be required to fill out the tree size matrix at which time a preliminary model will be completed for review.

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Anderson, Matt; Somers, Greg L.; Smith, W. Rick; Freeland, Mickey; Ruth, Donna 1998. Measuring crown dynamics of longleaf pine in the sandhills of Eglin Air Force Base. Proceedings of the 2nd Longleaf Alliance Conference; 1998 Novezzer 17-19; Charleston, SC. Longleaf Alliance Report No. 4. Longleaf. Alliance: 46-48. Auburn University, AL;

 


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