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Separation of Root Respiration from Total Soil Respiration Using Carbon-13 Labeling during Free-Air Carbon Dioxide Enrichment (FACE)

^a Dep. of Ecology & Evolutionary Biology—MS 170, Rice Univ., 6100 Main Street, Houston, TX 77005-1892 USA
^b Dep. of Geology and Geophysics, Boston College, Chestnut Hill, MA 02167 USA
^c Dep. of Botany, Duke Univ., Box 90340, Durham, NC 27708 USA
^d Dep. of Botany and Division of Earth and Ocean Sciences, Nicholas School of the Environment, Duke Univ., Box 90340, Durham, NC 27708 USA

View larger version (24K): [in a new window]   Fig. 1 The 13C of CO2 from (a) surface flux, (b) 15-cm depth, and (c) 30-cm depth collected from the replicated FACE experiment in treatment (closed circles, n = 3) and control (open circles, n = 3) plots. Error bars show 1 standard error from the mean. Vertical broken lines show the start of CO2 fumigation

View larger version (13K): [in a new window]   Fig. 2 The 13C of CO2 evolved from root free soil incubations over time in days from sample collection. Soils were collected from FACE treatment (closed circles, n = 3) and control (open circles, n = 3) plots. Error bars show 1 standard error from the mean

View larger version (29K): [in a new window]   Fig. 3 (a) The 13C of soil CO2 collected from 20-cm depth in the FACE prototype treatment (solid circles) and reference (open circles) plots. The vertical broken lines mark the dates that CO2 fumigation started for the growing season (on) and stopped for the winter (off). Arrows mark the points used for the calculation of percent live root contribution to soil CO2. (b) Daily rainfall (mm) measured at Chapel Hill, Orange County, NC (Office of the State Climatologist, North Carolina State University, Raleigh)