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The paper presents the results of the study of changes in the normal volume of absorption capacity of soil skeletons formed from the Magura sandstone in the Beskid Makowski area, and sampled from different genetic horizons. In the field of hydrology, the key issue in assessing the water storage capacity of the soil cover storage reservoir is the water storage capacity of the skeleton part. In the case of mountain soils, the issue of determining water storage capacity seems to be of importance due to the significant share of skeleton fraction in the soil cover. Moreover, the absorption capacity of the skeleton is related to the fraction volume. Soil test pits were executed in the area of Myślenice Forest District (southern Poland), in the habitat of Carpathian beech species Dentario glandulosae−Fagetum, in a stand of fir and spruce Abieti Piceetum. The scope of field work included sampling of 6 test profiles. In each profile, samples were taken from three identified genetic horizons. Sieve analysis method was used to determine the total content of skeleton and fine earth, and percentage share of each fraction. For each skeleton fractions, normal absorption capacity and bulk density were found. An important, supplementary part of the study was the isolation of fine−grained and coarse sandstone in each sample. After such processing, the collected material was compared with the material remaining after the successive stages of soil skeleton abrasion (weathering) in an aqueous medium, according to methodological assumptions. A device was used to perform this stage of the study. Changes in water storage capacity were mainly considered taking into account the fraction size and the location depth in a soil profile (without specifying the thickness changes). Differences were found between the absorption capacity of skeleton occurring naturally in the soil, and water absorption capacity of skeleton devoid of the outer layer of detritus as a result of the abrasion method. Water storage capacity values were decreasing after each successive step of the experimental run, along with increasing fraction size and the depth of their position in the profile. Preliminary results showed that the changes of absorption capacity are more strongly correlated with size of the fraction than with position in a genetic horizon., Sylwan 159 (6): 452-460

The research focuses on the potential interception that describes the amount of maximum storage capacity of the plant surface. The study regarded trees interception under simulated rain in the range of 2 to 11 mm/h. Non−linear model was proposed for estimation of the analysed parameter. Interdependence of potential interception and the intensity of rain and the size of droplets was described using exponential equation., Sylwan 158 (4): 292-297

The concept of potential interception is used to determine maximum amount of water that can be retained by the surface of all parts of a sprayed tree. The word ‘potential' is supposed to emphasize the fact that ‘maximum interception' is not a constant value. For each individual rainfall it may assume a different value. Potential interception values depend each time on rainfall intensity and drop size. Nevertheless, formulas describing the influence of species specifics of trees and other characteristics of surface are still being searched for. It is also being indicated that some characteristics may demonstrate a certain dynamics related to time of exposure to factors capable of modulating these characteristics., Sylwan 158 (11): 860-866

Quantity approach of forest trees interception necessary for build mathematical formulas need to be measured in continuously controlled conditions. We developed original methodology and build all equipment for measure interception in laboratory, which allows to achieve comparable results. It was also experimentally found to what extent the prepared apparatus allows for the assumed variability of selected parameters of simulated rainfall., Sylwan 157 (6): 464-469

The research investigates if and to what extent the current state of the sprinkled surface and the temperature of the water used can influence the level of interception. The analysis was based on a series of experiments undertaken in laboratory conditions. Photographic documentation has recorded the angle at which water droplets at different temperatures hit the surface of leaves and needles of beech, oak, fir, pine and spruce., Sylwan 157 (12): 922-928