SOIL SOLUTION CHEMISTRY IN THE PROFILES OF FOREST AND ARABLE LIGHT TEXTURED SOILS, SE POLAND

Soil solution composition and solution speciation of Al(III), Fe(III), Mn(II) in forest and arable sandy soil profiles were studied. Content s of ions were typically below 1.0 mmol dm(-3). Generally, amounts of Ca, K, Mg, and Cl, NO3, PO4 were higher in solutions of the arable soi l as compared to the forest soil. Contents of Mn, Fe, Al and SO4 were higher in forest soil solutions. The model GEOCHEM predicted a wide ra nge of free Al3+ and Mn2+ between horizons as well as between arable a nd forested sites. The model also predicted a substantial percentage o f Al-SO4 species, especially in forest solutions and high a percentage of Mn-humus acid complexes. (C) 1996 Elsevier Science Ltd