Acta Scientiarum Polonorum
Silvarum Colendarum Ratio et Industria Lignaria

Abstract Studies carried out on twenty plots in the Forest Districts of Czerniejewo and Jarocin were aimed identify at and characterising the site conditions of the Calamagrostio arundinaceae-Quercetum petraeae association in the central part of Wielkopolska. It was found that this association occurs on cambic arenosols, gleyic podzols and haplic luvisols developed from deep fluvio-glacial sands, outwash sands, boulder sands or boulder clays with a high sand content. All soils occupied by Calamagrostio arundinaceae-Quercetum petraeae are highly acidified with strongly leached surface layers, which determines the kind of vegetation ground cover. The productivity of soils and sites is due to the fertility of deep and very deep soil horizons which often contain carbonates. Depending on the trophy of these horizons, various site types have developed, namely a fresh mixed coniferous forest, fresh mixed broadleaved forest or less fertile variants of fresh broadleaved forest.