This research, conducted for the purposes of the protection of the National Park Bory Tucholskie, contains the results of the investigation of the chemical composition of humus (forest litter) and of atmospheric precipitation. The gathered material allowed determining the fate (accumulation or removal) of chemical elements contained in the pine forest humus as well as to compare the abundance of nutrients in humus and in atmospheric precipitation.
Andrzej Harasimiuk, Bogumił Wicik and Tomasz Grabowski
The lake deposits in Płock Basin (case studies of Lakes Rakutowskie and Żłoby)
Reconstruction of development of Lakes Rakutowskie and Żłoby in the late Pleistocene and Holocene was the aim of this research. Analysis of content of calcium carbonate, organic matter and C14 datings (7 samples) were done for two cores of sediments of 750 cm long. An average rate of accumulation was counted. Sediments of Lake Rakutowskie show homogeneity along the core which indicates similarity of sedimentation conditions. Sediments of Lake Żłoby were diversified and show variety related to cyclic changes. A common feature is a thick layer of fine sand without carbonate deposited during the older dryas, shown in both cores. The difference in sediment features of both lakes (which have similar depths) indicates that the Lake Żłoby is the more dynamic, filtering element, preceding Lake Rakutowskie in system of water catchment.
Agata Hasso-Agopsowicz, Maria Jeleńska and Bogumił Wicik
Among other forms, iron contained in soil is a component of magnetic minerals, both primary and secondary ones, produced by various soil forming processes. The composition of the soil magnetic fraction, characterised by a magnetic susceptibility, is the consequence of its origin. The character of susceptibility changes along the analysed chernozems’ profiles indicates a similarity of the parent rock, as well as the pedogenic processes forming the chernozems from the territories of Poland and the Ukraine. The influence of anthropogenic factors could be seen in the increased susceptibility within the humus horizon of the degraded chernozem.