Abstract: Gravitation soil solutions were investigated by using flat lysimeters in a nudal beech forest (group of types of geobiocens Fageta paupera typica inferiora, type of geobiocen Carex pilosa nudum), located in the Ecological Experimental Station (EES) Kremnicke vrchy mountains (Central Slovakia). Chemical properties of the percolated soil solutions were sampled monthly below surface humus (Ao-horizon) and the 10 cm and 25 cm thick mineral layers of andosolic cambisol. The soils were sampled monthy in Ao horizon, 10 cm and 25 cm depth, and their contents of four chemical elements Ca,Mg,K and Na, and pH and conductivity were analysed. The following amounts of the basic cations have been accumulated in mineral soil layers during the year (the balance is negatively influenced by freezing of Ao lysimeter in the winter) :calcium 2.6 kg Ca2+·hm-2 and 14.2 kg Ca2+·hm-2,magnesium 2.1 kg Mg2+·hm-2 and 1.1 kg Mg2+·hm-2,potassium 42.1 kg K+·hm-2 and 2.3 kg K+·hm-2,sodium 5.5 kg Na+·hm-2 and 2.0 kg Na+·hm-2.