Belowground harvest.We excavated two large soil pits by hand in each treatment ring in late June, 2009 at the conclusion of the ORNL FACE experiment. Roots were separated into diameter classes for biomass and nutrient analyses. Subsamples of sieved soil were used in a soil incubation experiment to determine carbon and nitrogen mineralization throughout the soil profile.
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Publications.Iversen CM, Keller JK, Garten CT, Norby RJ. 2012. Soil carbon and nitrogen cycling and storage throughout the soil profile in a sweetgum plantation after 11 years of CO2-enrichment. Global Change Biology 18: 1684-1697.
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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.