When we discuss the multiple use of forests, we frequently treat medicinal plants as inexhaustible natural resource, sometimes uncritically and without valid database. The aim of this research is to estimate the biomass of medicinal plants in central mountain region of Republic of Srpska.
Applying multiphase sampling scheme, we gathered data from 635 sample plots of 100 m2 each in various forest sites. On every sample unit we measured altitude, inclination and direction. Also, we estimated the density of crown canopy so as to meet the site specific light conditions. We counted individuals of all species, estimated their covering area and the form of appearance of their populations. We weighed useful parts of plants in fresh and air-dried condition. On the basis of the collected data we have also arrived at the inventory of medicinal plants, which are, apart of being curative, at the same time, attractive for market. Finally, we use regression analysis and some non-parametric statistical methods in order to investigate relations between biomass, configuration and sun radiation.