Аннотация:A three-dimensional model was developed to derive the reflection, absorption and transmission of photosynthetically active radiation (PAR) by a non-uniform forest canopy with a multi-species structure (Levashova et al., 2018). The model was used to describe the spatial patterns of solar radiation reflection and transmission by non-uniform mixed forest canopy and to develop an algorithm that allows to retrieve the proportion of different tree species in a mixed forest stand from measured canopy reflection coefficients for blue, green, red and near-infrared spectral bands (obtained from e.g. the Landsat satellite imagery).