ORNL FACE Fine Root Data

This report documents 3 data files with names of root_production.dat,root_mortality.dat, and root_crop.dat. These data were recorded biweekly during the growing season on five FACE plots from 1998 through 2006. Beginning in 2004, data also were recorded monthly during the winter.The calculation of root-length production, mortality, and standingcrop is described in Hendrick, R.L. and K.S.Pregitzer (1993) The dynamics of fine root length, biomass, and nitrogen content in two northern hardwood ecosystems. Can. J. For. Res. 23:2507-2520. Methods for collecting these data are documented in Norby, R.J., J. Ledford, C.D. Reilly, N.E. Miller, and E.G. O'Neill (2004) Fine-root productiondominates response of a deciduous forest to atmospheric CO2 enrichment. Proc. Natl. Acad. Sci. 101:9689-9693. Also, the conversion factors needed to convert the fine-root data from mm/tube to g/m**2 are discussed inthis paper.