Root-derived carbon and nitrogen input to the soil.We combined a long-term minirhizotron data set with continuous, root-specific measurements to assess carbon and nitrogen input from root mortality. We found that the flux of carbon and nitrogen into the soil nearly doubled under elevated [CO2] due to stimulated root production and mortality. Moreover, much of the carbon and nitrogen input occurred relatively deep in the soil profile where decomposition dynamics are likely to be different from what is commonly observed and modeled in the upper soil.
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Publications.Iversen CM, Ledford J, Norby RJ. 2008. CO2 enrichment increases carbon and nitrogen input from fine roots in a deciduous forest. New Phytologist: 179: 837-847.
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Related Publications.Franklin O, McMurtrie RE, Iversen CM, Crous KY, Finzi A, Tissue DT, Ellsworth DS, Oren R, Norby RJ. 2009. Forest fine-root production and nitrogen use under elevated CO2: contrasting responses in evergreen and deciduous trees explained by a common principle. Global Change Biology 15: 132-144.
Hockaday WC, Gallagher ME, Masiello CA, Baldock JA, Iversen CM, Norby RJ. 2015. Forest soil carbon oxidation state and oxidative ratio responses to elevated CO2. Journal of Geophysical Research - Biogeosciences 120: 1797-1811. |
Data Sets.See freely-available ORNL FACE data sets here: https://facedata.ornl.gov/ornl/.
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This research was funded by the Office of Biological and Environmental Research in the U.S. Department of Energy's Office of Science.