The objective of this paper was an attempt to estimate the impact of variable habitat conditions on the ionic state and ionic balance of selected species of plants occurring in an environment with scarce anthropogenic pressure in the Piska Primeval Forest, north-eastern Poland. The analysed mono- and dicotyledonous plants showed very high amounts of total nitrogen, exceeding sum of alkaline cations (Ca2+, Mg2+, K+, Na+), particularly at poor natural habitats (Sphagno-girgensohni-Picetum and Pino-Quercetum communities). Lack of alkaline cations is probably compensated by nitrogen in the form of NH4+, therefore maintaining the ionic balance of cations and anions in plants. Plants inhabiting habitats such as the Tilio-Carpinetum community show very high amounts of potassium. Some potassium radioactivity is probably indispensable for the physiological processes in plants instead of solar radiation
In this study physical and chemical analyses of soils were conducted in four areas of the habitat fresh mixed coniferous forest typical of the Kampinos National Park (20% forest area KPN). An attempt was made to evaluate the stock of organic carbon in every genetic horizon and the whole profiles of selected soils, and one counted the indicator ITGL (FSTI - Forest Soil Trophizm Index). In the examined soils, the particle size distributions, the content and ability to store organic carbon was analyzed as well as the amount of total nitrogen, C:N ratio, soil reaction and sorption properties. The highest content and stock of organic carbon was noted in the Brunic Arenosol (Distric) Postagricultural. In the investigated soils, the reserve of the organic carbon is accumulated in almost equal proportional shares, dividing soil into horizontal organic and mineral parts.