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Low Dissolved Organic Carbon Input from Fresh Litter to Deep Mineral Soils

^a Environmental Sciences Division, Oak Ridge National Laboratory Oak Ridge, TN 37831-6422
^b Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, Livermore, CA 94550
^c Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6422

View larger version (17K): [in this window] [in a new window]   Fig. 1. Experimental treatments in the Enriched Background Isotope Study.

View larger version (44K): [in this window] [in a new window]   Fig. 2. Measured patterns of soil water content at two depths within the soil profile of all four study sites (thin lines) along with the predicted water content for each depth (heavy line). Differences in the magnitude of the water content at a given depth for each site and their respective field capacities (flat portions of these curves) are dependent on location-specific rock content and probe calibration biases.

View larger version (34K): [in this window] [in a new window]   Fig. 3. Measured concentration of dissolved organic carbon (DOC) in lysimeter samples collected at 15- and 70-cm depth at each of the four study sites (Haw Ridge [HR], Pine Ridge [PR], Walker Branch [WB], and Tennessee Valley Authority [TVA]) throughout 2002 and 2003.

View larger version (49K): [in this window] [in a new window]   Fig. 4. The derivation of dissolved organic carbon (DOC) flux below the A horizon (below 15 cm) or through the B horizon (below 70 cm) throughout 2002 and 2003 for the Haw Ridge soils. Point-in-time measures of DOC concentrations ([DOC])were assumed to apply equally during the time period between measurements (Fig. 1) when percolation flow down through the soil profile was greater than zero. Similar data are available for the Walker Branch, Pine Ridge, and Tennessee Valley Authority sites.

View larger version (30K): [in this window] [in a new window]   Fig. 5. Carbon-14 content in bulk soil (solid bars) and dissolved organic carbon (DOC; patterned bars) for both treatments at all four sites averaged for 2002 and 2003. Error bars represent standard errors.