PECULARITIES OF THE SEASONAL DEVELOPMENT OF THE NORTHERN OAK IN THE BRYANSK REGION
The article presents the data of phenological observations for the period of 2011-2013 for northern oak (Quercus borealis) and English oak (Quercus robur) in the training and experimental forestry of BSETA (Bryansk region). An attempt was made to identify the relationship between the amount of effective temperatures, the amount of rain and the onset of different phenological phases in northern oak and in English oak. The close relationship (r = 0,794) was revealed between the length of the growing season in northern oak and the sum of effective temperatures of air above + 5ºC. Introduced oak, as well as local one, has complete cycle of seasonal development of vegetative and generative organs. It was found that the length of the growing season in northern oak was greater in all years of observations than in English oak. The increase in the growing season in northern oak occurred mainly due to the later completion. An attempt was made for calendaring seasonal development of northern oak in the Bryansk region. To carry out phenological observations modern techniques have been used. It was found that under favorable weather conditions in of northern oak there are two growths in height in the season. As a result of phenological observations it was found that a significant level of chronological and intraspecific variation on phenology suggests broad adaptive capacity of the species, great breeding potential for mass reproduction and introduction in forest cultures of the Bryansk region.