Influence of some soil properties on the content of selected Al forms in the soil of the dumpsite Litov

In 110 soil samples taken from the surface layer of the dumpsite Litov, con tent of labile Al in 1 M KCl extract and of Al extractable with 0.05 M Na4P 2O7 was determined in order to assess the influence of basic soil propertie s and management measures on Al forms. All determined properties showed ver y high variability. Mean labile Al content was 70.1 mg.kg(-1), mean content of Al in pyrophosphate extract was 1487 mg.kg(-1). On sites where no impro ving measures took effect, there was higher acidity and carbon and labile A l content than on areas covered with natural topsoil or planted with high-g rown tries, On the latter areas, on the contrary, there was a higher amount of Al in pyrophosphate extract, probably due to higher content of complexi ng organic compounds. The relationships were complicated by carbon derived from brown coal remains, However, as a result of management measures, the p rocesses developed towards processes common in natural soils. soil pH and o rganic matter being the most important factors affecting Al speciation.