title: ONTOGENETIC SCALES OF RELATION OF TREES TO LIGHT (ON THE EXAMPLE OF EASTERN EUROPEAN FORESTS)
abstract: Scales of shade tolerance, light demand and ranges of light possibilities for 13 tree species of the Eastern European forests have been developed. The variability of these plant properties in ontogeny is shown. Shade tolerance is the lower limit of the light and production potential of plants. The light minimum of the undergrowth is based on the ontogenetic scales of shade tolerance. The light minimum was determined with the help of individuals with extremely low vitality and which grew under a 
journal: Russian Journal of Ecosystem Ecology