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Sorption and Fractionation of Dissolved Organic Matter and Associated Phosphorus in Agricultural Soil

^a DHI–Water and Environment, Dep. of Hydrology, Soil and Waste, Agern Allé 11, DK-2970 Hørsholm, Denmark
^b The Univ. of Copenhagen, Faculty of Life Sciences, Højbakkegård Allé 9, DK-2630 Taastrup, Denmark
^c The Univ. of Copenhagen, Thorvaldsensvej 40, DK-1871 Frederiksberg C, Denmark

View larger version (18K): [in this window] [in a new window]   Fig. 1. Effect of pH on dissolved organic carbon (DOC) sorption showing adsorbed DOC as function of DOC in solution with time for the Ap, EB, and Bt horizons. Left: pH 7, right: pH 5. Dots indicate average of two replicates.

View larger version (22K): [in this window] [in a new window]   Fig. 2. Effect of pH on dissolved organic phosphorus (DOP) sorption showing adsorbed DOP as function of DOP in solution with time for the Ap, EB, and Bt horizons. Left: pH 7, right: pH 5. Dots indicate average of two replicates.

View larger version (23K): [in this window] [in a new window]   Fig. 3. Simulated (Eq. [6], lines) and measured (dots) dissolved organic carbon (DOC) concentrations vs. time of reaction for different initial concentrations of DOC added.

View larger version (24K): [in this window] [in a new window]   Fig. 4. Simulated (Eq. [6], lines) and measured (dots) dissolved organic phosphorus (DOP) concentrations vs. time of reaction for different initial concentrations of DOP added.

View larger version (15K): [in this window] [in a new window]   Fig. 5. Comparison of measured and simulated (Eq. [6]) values of dissolved organic C (DOC) (left) and dissolved organic P (DOP) (right) concentrations for all samples investigated. The line 1:1 indicates where a measured value is equal to a simulated value.

View larger version (16K): [in this window] [in a new window]   Fig. 6. Fractionation of dissolved organic carbon (DOC) and dissolved organic phosphorus (DOP) during sorption represented by the DOC/DOP ratios in solution vs. dissolved DOC concentration for Ap, EB, and Bt horizons at pH 7 (left) and pH 5 (right). Dots correspond to averages for all reaction times for each soil sample.