## 3 Results and Discussion
### Effect of Basic Soil Properties on WDPT and MED Values  
It was found that topsoil moisture detected in the field is closely related to results of WR testing. Similarly as in the previous studies ([PERSON] et al., 2016; [PERSON] et al., 2016), also we observed an inverse relation between WDPT\({}_{\rm A}\) (r = \(-\)0.54; \(p\) \(<\) 0.001), WDPT\({}_{\rm P}\) (r = \(-\)0.47; \(p\) \(<\) 0.001), or MED values (r = \(-\)0.49; \(p\) \(<\) 0.001) and soil moisture in the field (w\({}_{\rm F}\)). A positive effect of SOM or SOC contents on the WR was only partially confirmed. Whereas SOM (r = 0.32; \(p\) \(<\) 0.05) and SOC (r = 0.35; \(p\) \(<\) 0.05) contents were significantly correlated with MED results, correlation between either of the two variables and WDPT data was insignificant. SOC content was successfully tested as a partial predictor of WDPT or MED values in multiple regression analysis. Testing of the partial regression coefficient associated with SOM content showed that its effect on WR data is negligible. This suggests that besides overall content of SOC, SOM quality may be more important for the occurrence of SWR. The presence and relative amount of specific functional groups bound within SOM, their degree of dissociation, and thermal stability of SOM components are examples of the parameters that may play an important role in SWR development. The data presented in this study confirmed a general trend of increasing WR with lowering of soil pH (the r values ranged between \(-\)0.32 and \(-\)0.43; \(p\) \(<\) 0.05). The studied soils are developed from granitic parent material in a relatively humid and cold climate, under a coniferous tree canopy. In such conditions, formation of SOM with a raw moor-like character is favored. In the surface horizon, there are high amounts of dissociating organic acids which lower the soil reaction. Some of the detected pH values (<4) suggest that the acidic character of the samples is probably also accentuated by dissociation of mineral acids (sulfuric and/or nitric). They enter the toposoil due to amounts of nitrate and sulfate anions contained in atmospheric precipitation. [PERSON] et al. (2015) reported that a decrease in soil pH in the Western Tatras is driven significantly by the deposition from the atmosphere. Acidification of the soil environment is probably causing stabilization of organic inputs which are entering the toposoil. Slower mineralization rates and hence higher amounts of accumulated carbon in the epipedon, as a partial consequence of accelerated soil acidification, have been reported from various forest ecosystems of Northern and Central Europe ([PERSON] et al., 2015). This points out that the balance between the rate of accumulation of organic inputs on one hand, and the rate of stabilization or mineralization on the other, may be important for SWR development. A significant negative correlation between WDPT data and soil pH was observed by [PERSON] et al. (2016) who studied SWR in calcareous soils. An increase in repellency due to soil acidification in the laboratory was reported by [PERSON] et al. (2016). The results of regression analysis showed that more than one half of WDPT and MED variances can be explained by varying field water and organic carbon contents together with change in soil pH value. Whereas the content of organic carbon affects WR positively, the effect of field moisture and soil pH on repellency is negative. The regression equations suggest that WR varies nonlinearly with soil moisture and, at the same time, changes linearly with soil pH and organic carbon content. Applying either a logarithmic or quadratic relation between field moisture content and SWR in the regression analysis led to better results in comparison to a linear relation. A nonlinear relation between WR and soil moisture was reported previously by [PERSON] [7] and [PERSON] et al. [8]. Although the variables, used as predictors, were proved to affect WDPT and MED values significantly, the predictive power of the model itself is lacking.