The contents of calcium, magnesium and mineral carbon were investigated in the ground and surface water of shelterbelts and also in four small ponds of different surroundings as well as in water-courses of agricultural landscape. In these studies, differences among the concentrations of calcium, magnesium and mineral carbon were attributed solely to different surroundings of the ponds and water-courses, and also to width of the shelterbelt. The biogeochemical barrier in the form of shelterbelt efficiently decreases the concentration of chemical substances included in the dry mass from 30 to 75%, calcium from 20 to 54%, magnesium from 46 to 72% and also mineral carbon from 58 to 71%. The smallest contents of every investigated substance characterized the water of pond surrounded by a wide zone of meadow.