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Biomass Partitioning and Growth Efficiency of Intensively Managed Pinus taeda and Pinus elliottii Stands of Different Planting Densities

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Abstract:



The effect of planting density (740, 2,220, 3,700, and 4,440 trees/ha-1) on growth efficiency and biomass partitioning was examined in intensively managed stands of 4-yr-old loblolly (Pinus taeda L.) and slash pine (Pinus elliottii Engelm.) stands on the Coastal Plain of southern Georgia. The primary objective of this study was to determine whether decreased partitioning of biomass to stem relative to other tree components limits stem biomass growth on a per hectare basis as stand density increases. Fourth growing season stem biomass production did not increase proportionally with planting density, indicating that stem biomass growth was limited at the higher stand densities. For both species, growth efficiency (stem biomass growth produced during the fourth growing season per unit of leaf biomass) was significantly lower for stands planted at 740 trees/ha-1 compared to the other stand densities. Similarly, the ratio of stem biomass growth: fine root biomass was significantly lower for the 740 trees/ha-1 stand. Within sites, planting density had no effect on the ratio of fine root biomass: leaf biomass for either species. Overall, these results indicate that partitioning to stem growth increased relative to foliage or fine roots as stand density increased. Therefore, the limitation in stem biomass growth on a per hectare basis that occurred as stand density increased was not due to changes in partitioning, but probably due to a limitation in net primary production. FOR. SCI. 47(2):224–234.

Keywords: Biomass partitioning; Pinus elliottii; Pinus taeda; environmental management; fine root biomass; forest; forest management; forest resources; forestry; forestry research; forestry science; growth efficiency; leaf biomass; natural resource management; natural resources

Document Type: Miscellaneous

Affiliations: 1: 2505 13th St. NW, Washington, DC, 20009, Phone: (202) 249-1688 colterburkes@hotmail.com 2: Warnell School of Forest Resouces, University of Georgia, Athens, GA, 30602, Phone: 706-542-6821; Fax: 706-542-8356 rwill@smokey.forestry.uga.edu 3: Biosphere II, 32540 S. Biosphere Rd., P.O. Box 689 Oracle, AZ, 85623, Phone: 520-896-6237 gbarron@bio2.columbia.edu 4: Warnell School of Forest Resouces, University of Georgia, Athens, GA, 30602, Phone: 706-542-5055 teskey@smokey.forestry.uga.edu 5: Warnell School of Forest Resouces, University of Georgia, Athens, GA, 30602, Phone: 706-542-3009 shiver@smokey.forestry.uga.edu

Publication date: 2003-04-01

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.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 in forestry

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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