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Particle Leaching and Particle-Facilitated Transport of Phosphorus at Field Scale

^a Danish Institute of Agricultural Sciences, Dep. of Agroecology, Research Centre Foulum, P.O. Box 50, 8830 Tjele, Denmark
^b Aalborg University, Dep. of Life Sciences, Environmental Engineering Section, Sohngaardsholmsvej 57, 9000 Aalborg, Denmark

View larger version (27K): [in a new window]   Fig. 1. Sampling grid.

View larger version (39K): [in a new window]   Fig. 2. Experimental setup.

View larger version (21K): [in a new window]   Fig. 3. Operationally defined fractionation of P forms in the effluent. DRP, dissolved reactive P; TRP, total reactive P; TDP, total dissolved P; TP, total P; PIP, particulate inorganic P; DIP, dissolved inorganic P; POP, particulate organic P; and DOP, dissolved organic P. Adapted from Haygarth et al. (1998).

View larger version (24K): [in a new window]   Fig. 4. Particle concentration in column effluent as a function of accumulated outflow. The specific numbers refer to grid numbers in Fig. 1.

View larger version (95K): [in a new window]   Fig. 5. Field variations in (a) the accumulated mass of leached particles (mg), (b) macropore flow velocity (m h–1), (c) clay content (%), and (d) water-dispersible colloids (mg kg–1).

View larger version (16K): [in a new window]   Fig. 6. (a) Accumulated mass of leached particles as a function of average electrical conductivity of the effluent and the macropore flow velocity. (b) Accumulated mass of leached particles and dyed areas of active macropores as a function of bulk density.

View larger version (21K): [in a new window]   Fig. 7. Accumulated mass of leached particles as a function of the air-filled porosity at –20 cm soil water potential. The encircled data points are from columns that ponded during the experiments.

View larger version (99K): [in a new window]   Fig. 8. Field variations in the accumulated mass of leached (a) particulate inorganic P (mg), (b) particulate organic P (mg), (c) dissolved inorganic P (mg), and (d) dissolved organic P (mg).

View larger version (29K): [in a new window]   Fig. 9. Accumulated mass of leached P fractions as a function of the accumulated mass of leached particles.

View larger version (17K): [in a new window]   Fig. 10. Accumulated mass of leached particulate inorganic P as a function of macropore flow velocity.