FEATURES OF A PINUS PUMILA BIOLOGY IN THE NORTH OF TRANSBAIKALIE
The Pinus pumila in Transbaikalie occupies the space more than 1,5 million hectares from which 1,1 million hectares and is concentrated in the Kalarsky area. Plantings of Pinus pumila have low productivity, middle class of site class V and age of about 60 years. The Pinus pumila grows in continuous thickets and rare open plantings with completeness 0,1.0,2 in pre-loaches belt up to border of wood distribution. Average stock of Pinus pumila is 20.30 m <sup>3</sup>/ha. The Pinus pumila grows slowly on 5.6 sm in a year. It transfers winter well but the branches which remained opened from snow die in spring because of temperatures' fall. It is a perspective bush for nuts' use in food industry and wood greens in medicine. Growing on stony scatterings, peat and gley and sandy soils, it forms almost impassable thickets highly in mountains, which carry out climate, soil-protective, waterpreserving, biore-sourse, fodder and social functions. The Pinus pumila on the burnt forest areas and cuttings down renews through change of breeds some decades later. In the article the Pinus pumila biological features, growing in mountain conditions of severe continental climate in the north of Transbaikalie are given. Environmental issues are considered