The research focuses on the potential interception that describes the amount of maximum storage capac− ity 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
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.
The prerequisite of conducting investigations on the water retention ability of the organic layers of forest soils in case of simulated rainfall was developing of appropriate methods of sampling and methods of conducting the experiment. The basic assumptions need: 1. botanical uniformity of analyzed samples, 2. the way that the samples are collected, including the succession of soil layers and slope inclination, 3. unification of the conditions for conducting experiments in respect to the intensity and duration of rainfall and the length of breaks between consecutive rainfalls, 4. conducting investigations within the entire range of moisture contents of soil samples.
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