Partitioning in Trees and Soils.Our objective was to improve the carbon partitioning routines in existing ecosystem models, and test the models using short-term, comprehensive field measurements of processes related to carbon partitioning from leaves to roots and roots to soil.
In 2010, we fumigated a loblolly pine stand at the University of Tennessee Forest Resources Research and Education Center, Oak Ridge, TN, USA, with 13C-enriched CO2, and compared carbon partitioning, above- and belowground, in shaded and unshaded trees. In 2011, we returned to the site of a historical Free-Air CO2-enrichment (FACE) experiment in a sweetgum plantation. We girdled one-half of the trees in each treatment plot with goals of determining the effects of tree carbon inputs on soil carbon and nutrient cycling, and quantifying the size of belowground carbon storage pools. In 2012, we fumigated individual dogwood trees at the University of Tennessee Forest Resources Research and Education Center with 13C-enriched CO2, and again compared carbon partitioning, above- and belowground, in shaded and unshaded trees, this time in a deciduous tree plant functional type. |
Publications.Lynch DJ, Matamala R, Iversen CM, Norby RJ, Gonzalez-Meler MA. 2013. Stored carbon partly fuels fine-root respiration but is not used for production of new fine roots. New Phytologist199: 420-430.
Mao J, Ricciuto DM, Thornton PE, Warren JM, King AW, Shi X, Iversen CM, Norby RJ. 2016. Evaluating the Community Land Model in a pine stand with 13CO2 labeling and shading manipulations. Biogeosciences 13: 641-657. Warren JM, Iversen CM, Garten CT, Norby RJ, Childs J, Brice DJ, Evans RM, Gu L, Thornton PE, Weston DJ. 2012. Timing and magnitude of carbon partitioning through a young loblolly pine (Pinus taeda L.) stand using 13C labeling and shade treatments. Tree Physiology 32: 799-813. |
Related Publications. |
Data Sets. |
This research was funded by the Office of Biological and Environmental Research in the U.S. Department of Energy's Office of Science.