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Dissolved Organic Carbon Fluxes under Bare Soil

^a Soil and Water Management, K.U. Leuven, Celestijnenlaan 200E, B-3001 Heverlee, Belgium
^b Agrosphere, ICG-IV, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany

View larger version (16K): [in this window] [in a new window]   Fig. 1. Experimental layout: (a) location of the five pits, (b) zoom into 1 pit, each pit is equipped with six automatic equilibrium tension plate lysimeters (AETPLs) at 0.4 m and six AETPLs at 1.2-m depth, (c) location of the trench in which soil moisture content and soil temperatures were measured, and (d) location of the climatological station.

View larger version (27K): [in this window] [in a new window]   Fig. 2. Boxplots of the annual leachate flux densities (mm y–1), Br– recoveries (mg m–2), and annual DOC (dissolved organic carbon) flux densities (mg C y–1 m–2) sampled by the six automatic equilibrium tension plate lysimeters (AETPLs) at 0.4- and 1.2-m depths in each of the five pits. Each boxplot has lines at the lower quartile, median, and upper quartile values; lines (whiskers) extending from each end of the box show the extent of data. Outliers are data with values beyond the ends of the whiskers; if there is no data outside the whisker, a dot is placed at the bottom whisker.

View larger version (20K): [in this window] [in a new window]   Fig. 3. Average bromide concentration (mg L–1) against average cumulative infiltration (mm) of all automatic equilibrium tension plate lysimeters (AETPLs) at 0.4 and at 1.2 m, ie., the average breakthrough curves at 0.4- and 1.2-m depths. First moments (T1) are indicated by the vertical dotted lines.

View larger version (14K): [in this window] [in a new window]   Fig. 4. Total number of pore volumes (–) sampled against the total amount of leachate volume (mm) sampled by each automatic equilibrium tension plate lysimeter (AETPL) at 0.4 and 1.2 m.

View larger version (14K): [in this window] [in a new window]   Fig. 5. First moment (mm) against the total amount of leachate volume (mm) sampled at 0.4 and 1.2 m.

View larger version (16K): [in this window] [in a new window]   Fig. 6. Average and standard deviation of the measured dissolved organic carbon (DOC) concentration (mg C L–1) at each of the sampling dates at 0.4- and 1.2-m depth.

View larger version (28K): [in this window] [in a new window]   Fig. 7. Dissolved organic carbon (DOC) concentration (mg C L–1) against the averaged temperatures (°C) and soil moisture contents (cm3 cm–3) between two subsequent sampling dates.

View larger version (16K): [in this window] [in a new window]   Fig. 8. Time-averaged water velocity (mm d–1) between two subsequent sampling dates against measured dissolved organic carbon (DOC) concentration (mg C L–1) at 0.4- and 1.2-m depth.