Assessment of the Effect of Uncontrolled Landfill Sites on the Content of Available Forms of Selected Macro- and Microelements in Forest Soil

The paper presents the results of the effect of uncontrolled landfill sites located in the sandy soils of the Bydgoszcz Forest (central Poland, the Kujawy and Pomerania Province) on the content of available forms of selected macro- and microelements. Soil was sampled from the mineral surface horizon (0-20 cm) under three uncontrolled landfill sites (W1, W2, W3). They were the landfill spots on the surface of 20-35 m(2) of different morphological composition. The control point (C) was located far from the waste landfill sites and beyond the range of their effect. Those soils were classified as Brunie Arenosols. This paper presents the arithmetic means of the results from three replications. Besides, the results of the analyses of the features investigated were exposed to the analysis of simple correlation (P < 0.05). Moreover, the principal component analysis (PCA) was used. The research demonstrated a significant effect of uncontrolled landfill sites on the changes in the soil reaction as well as significant changes in the content of organic carbon, available forms of phosphorus, potassium, magnesium, copper and zinc. With the analysis of variance, it was found that the soil sampled under landfill site showed a significantly highest amount of the macro- and microelements studied. The analysis of correlation confirmed a significant positive dependence between the content of available forms of all the elements analysed and the soil reaction. Two principal components (PC1 and PC2) were extracted from the available data set which accounted for a total variance of approximately 92.02%.