Velikoridko T. Tolerance and variation of Pinus sylvestris L. under industrially polluted conditions of the Ukrainian south-east.

The objects are the plants of the Pinus sylvestris L. populations on the testing areas. The aim is to define a degree of emissions' power of the industrial chemical plants "Azot" and "Plastmass" on a Pinus sylvestris L. and the tolerance to the industrial air pollution on the basis of the analysis of parameters' variability of a vital condition, productivity of trees and features of populations' structure on a distance up to sources of industrial emissions. The results of comparative-and-monitoring studies of variation of morphometric, reproductive indices, a life state of plants and structural-and-hereditory elements in populations of Pinus sylvestris L. have shown, that pine forests of the south - eastern Ukraine which are exposed to emissions of the Rubizhansk-Severodonetsk industrial junction chemical plants toxic are in a state of digression and in particular zones of pollution are also in a state of degradation, in spite of decrease of emissions' volumes in recent decades. The impact of chemicalplants toxic emissions that together with the natural climatic conditions cause decrease of needles' amount and partly a crown's defoliation do not call significant inhibition of sexual reproductive function of plants.Pinus sylvestris trees, tolerant to chemical plants' emissions, and characterised by high full value seeds productivity are recommended for use as initial plants for forming of regional seed reproduction fields and of long-living plantings under anthropogenously transformed environmental conditions of the Ukrainian south-east.