Long-term Effects of Free Air CO2 Enrichment (FACE) on Soil Respiration |
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Authors: | E. S. Bernhardt J. J. Barber J. S. Pippen L. Taneva J. A. Andrews W. H. Schlesinger |
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Affiliation: | (1) Department of Biology, LSRC B234, Duke University, Box 90000, Durham, NC 27708, USA;(2) Department of Mathematical Sciences, Montana State University, Bozeman, MT 59717, USA;(3) Nicholas School of the Environment and Earth Sciences, Duke University, Durham, NC 27708, USA;(4) Department of Biological Sciences, University of Illinois at Chicago, Chicago, Il 60607, USA;(5) Locke, Liddell & Sapp, LLP, 3400 JPMorgan Chase Tower, 600 Travis Street, Houston, TX 77002-3095, USA |
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Abstract: | Emissions of CO2 from soils make up one of the largest fluxes in the global C cycle, thus small changes in soil respiration may have large impacts on global C cycling. Anthropogenic additions of CO2 to the atmosphere are expected to alter soil carbon cycling, an important component of the global carbon budget. As part of the Duke Forest Free-Air CO2 Enrichment (FACE) experiment, we examined how forest growth at elevated (+200 ppmv) atmospheric CO2 concentration affects soil CO2 dynamics over 7 years of continuous enrichment. Soil respiration, soil CO2 concentrations, and the isotopic signature of soil CO2 were measured monthly throughout the 7 years of treatment. Estimated annual rates of soil CO2 efflux have been significantly higher in the elevated plots in every year of the study, but over the last 5 years the magnitude of the CO2 enrichment effect on soil CO2 efflux has declined. Gas well samples indicate that over 7 years fumigation has led to sustained increases in soil CO2 concentrations and depletion in the δ13C of soil CO2 at all but the shallowest soil depths. |
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Keywords: | Carbon dioxide enrichment Del 13C Duke Forest FACE Soil CO2 Soil respiration |
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