Soil solution chemistry in the profiles of forest and arable light textured soils, S.E. Poland

Soil solution composition and solution speciation of Al(III), Fe(III), Mn(II) in forest and arable sandy soil profiles were studied. Contents 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 soil 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 range of free Al3+ and Mn2+ between horizons as well as between arable and forested sites. The model also predicted a substantial percentage of Alsingle bondSO4 species, especially in forest solutions and high a percentage of Mn-humus acid complexes.