Forests 2011, 2(3), 749-776; doi:10.3390/f2030749

A Flexible Hybrid Model of Life Cycle Carbon Balance for Loblolly Pine (Pinus taeda L.) Management Systems

1 School of Forest Resources and Conservation, University of Florida, P.O. Box 110410, Gainesville, FL 32611-0410, USA 2 CellFor Corporation, 817 West Peachtree Street NW, Suite 210, Atlanta, GA 30308, USA
* Author to whom correspondence should be addressed.
Received: 13 May 2011; in revised form: 3 August 2011 / Accepted: 1 September 2011 / Published: 15 September 2011
(This article belongs to the Special Issue Adaptation of Forests and Forest Management to Climate Change)
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Abstract: In this study we analyzed the effects of silvicultural treatments on carbon (C) budgets in Pinus taeda L. (loblolly pine) plantations in the southeastern United States. We developed a hybrid model that integrated a widely used growth and yield model for loblolly pine with published allometric and biometric equations to simulate in situ C pools. The model used current values of forest product conversion efficiencies and forest product decay rates to calculate ex situ C pools. Using the model to evaluate the effects of silvicultural management systems on C sequestration over a 200 year simulation period, we concluded that site productivity (site quality), which can be altered by silviculture and genetic improvement, was the major factor controlling stand C density. On low productivity sites, average net C stocks were about 35% lower than in stands with the default average site quality; in contrast, on high quality sites, C stocks were about 38% greater than average productivity stands. If woody products were incorporated into the accounting, thinning was C positive because of the larger positive effects on ex situ C storage, rather than smaller reductions on in situ C storage. The use of biological rotation age (18 years) was not suitable for C sequestration, and extended rotation ages were found to increase stand C stock density. Stands with an 18-year-rotation length had 7% lower net C density than stands with a 22-year-rotation length; stands with a 35-year-rotation length had only 4% more C than stands harvested at age 22 years. The C sequestered in woody products was an important pool of C storage, accounting for ~34% of the average net C stock. Changes in decomposition rate, associated with possible environmental changes resulting from global climate change, affected C storage capacity of the forest. When decay rate was reduced to 10% or increased to 20%, the C stock in the dead pool (forest floor and coarse woody debris) was reduced about 11.8 MgC∙ha−1 or increased about 13.3 MgC∙ha−1, respectively, compared to the average decay rate of 15%. The C emissions due to silvicultural and harvest activities were small (~1.6% of the gross C stock) compared to the magnitude of total stand C stock. The C model, based on empirical and biological relationships, appears appropriate for use in regional C stock assessments for loblolly pine plantation ecosystems in the southern U.S.
Keywords: loblolly pine; silviculture; stand dynamics; forest floor; life cycle analysis; carbon stock modeling

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MDPI and ACS Style

Gonzalez-Benecke, C.A.; Martin, T.A.; Jokela, E.J.; Torre, R.D.L. A Flexible Hybrid Model of Life Cycle Carbon Balance for Loblolly Pine (Pinus taeda L.) Management Systems. Forests 2011, 2, 749-776.

AMA Style

Gonzalez-Benecke CA, Martin TA, Jokela EJ, Torre RDL. A Flexible Hybrid Model of Life Cycle Carbon Balance for Loblolly Pine (Pinus taeda L.) Management Systems. Forests. 2011; 2(3):749-776.

Chicago/Turabian Style

Gonzalez-Benecke, Carlos A.; Martin, Timothy A.; Jokela, Eric J.; Torre, Rafael De La. 2011. "A Flexible Hybrid Model of Life Cycle Carbon Balance for Loblolly Pine (Pinus taeda L.) Management Systems." Forests 2, no. 3: 749-776.

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