In field conditions, direct measurement of plant interception is still a difficult task, especially because of methodological limitations and also that of technical and organizational nature. [Olszewski, 1984, Kossowska-Cezak et al., 2000].The way to deepen the knowledge about the determinants of interception in forest areas is research in controlled conditions [Anzhini et al,. 2007], which could provide the data for the identification of the mathematical models. Pei et al. [1993] performed a laboratory simulation of precipitation on a set tree surface by changing the intensity of the rain ten times in the range of 47.4 to 147.6 mm/h. Similarly, Keim et al. [2006] applied a rate of 20 to 420 mm/h by changing the droplet size of the simulated precipitation from 1.0 to 2.8 mm. These amounts of precipitation are not likely to occur in the Polish climate. The essence of the research was to spray trees with simulated rain with certain characteristics, according to the methodology previously developed and tested on mockups.To carry out the research on trees interception of simulated rain in the range of 2 to 11 mm/h autors had to design and build a sprinkler device [Klamerus - Iwan et al., 2013] taking into ...
