INFLUENCE OF ENVIRONMENTAL-POLLUTION BY SULFUR-OXIDES ON THE MORPHOLOGICAL STRUCTURE OF THE CROWN, GENERATIVE SPHERE, AND POLLEN VIABILITY OF THE SIBERIAN FIR IN THE BAIKAL REGION

The sulfur content in needles, the morphological structure of the crow n, and the pollen quality of drying and healthy Siberian fir trees gro wing at different distances from the Baikal Integrated Pulp-and-Paper Mill were investigated. The highest content of sulfur in the needles w as revealed in trees growing on the Khamar-Daban chain at height of 11 00-1200 m a.s.l. It was determined that intensive fir forest decline, changes in the morphological structure of the crown, and the productio n of low quality pollen take place under the same conditions.