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Nitrogen and Carbon Cycling in a Model Longleaf Pine Community as Affected by Elevated Atmospheric CO2

Author

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  • H. Allen Torbert

    (USDA-ARS National Soil Dynamics Laboratory, Auburn, Alabama)

  • Stephen A. Prior

    (USDA-ARS National Soil Dynamics Laboratory, Auburn, Alabama)

  • G. Brett Runion

    (USDA-ARS National Soil Dynamics Laboratory, Auburn, Alabama)

  • Micheal A. Davis

    (University of Southern Mississippi, Hattiesburg, Mississippi, Department of Biological Sciences)

  • Seth G. Pritchard

    (College of Charleston, Charleston, South Carolina, Biology Department)

  • Hugo H. Rogers

    (USDA-ARS National Soil Dynamics Laboratory, Auburn, Alabama)

Abstract

Increasing global atmospheric CO2 concentration has led to concerns regarding its potential effects on terrestrial ecosystem and the long-term storage of C and N in soil. This study examined responses to elevated CO2 in a typical regenerating longleaf pine-wiregrass community. The model community consisted of five plant species: (1) an evergreen conifer (Pinus palustris), (2) a bunch grass (Aristida stricta), (3) a broadleaf tree (Quercus margaretta), (4) a perennial herbaceous legume (Crotalaria rotundifolia), and (5) a herbaceous perennial (Asclepias tuberosa) grown at two CO2 concentrations (ambient and twice ambient). The CO2-enriched plots had greater aboveground biomass than ambient plots, mainly due to increased pine biomass. After 3 years, samples of the soil (Blanton loamy sand: loamy, siliceous, semiactive, thermic Grossarenic Paleudult) were collected from 0- to 5-, 5- to 10-, and 10- to 20-cm depth increments. Microbial respiration, potential C and N mineralization, and C turnover were measured during a 120-day incubation of the soil samples. Elevated CO2 decreased soil C respiration and C turnover, but increased N mineralization. Results indicate that soil C sequestration is likely for soils in this longleaf pine ecosystem.

Suggested Citation

  • H. Allen Torbert & Stephen A. Prior & G. Brett Runion & Micheal A. Davis & Seth G. Pritchard & Hugo H. Rogers, 2004. "Nitrogen and Carbon Cycling in a Model Longleaf Pine Community as Affected by Elevated Atmospheric CO2," Environmental Management, Springer, vol. 33(1), pages 132-138, July.
    • Handle: RePEc:spr:envman:v:33:y:2004:i:1:d:10.1007_s00267-003-9123-4
    DOI: 10.1007/s00267-003-9123-4
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