INTRODUCTION OF PLANTS OF THE GENERA FORSYTHIA AND FRAXINUS AT THE ARBORETUM OF V. N. SUKACHEV INSTITUTE OF FOREST, SIBERIAN BRANCH, RUSSIAN ACADEMY OF SCIENCES

The modern climate of the South of the Middle Siberia makes it possible for many other regions woody plants to grow here. Introduced plants are widely used in landscaping of cities and towns, in creation of the protective forest plantations, as well as for scientific and educational purposes. Therefore, regular summarizing the results of plant introduction is of great practical value. This research is devoted to the introduction of two East Asian species (early forsythia ( Forsythia ovata Nakai) and Manchurian ash ( Fraxinus mandshurica Rupr.)) and one North American species (green ash ( Fraxinus pennsylvanica Marsh.)) the olive family (Oleaceae) in the arboretum of V. N. Sukachev Institute of Forest Sib. Br. Rus. Acad. Sci. in Krasnoyarsk Akademgorodok. The plants of these three species were found to show high winter hardiness - their shoots are not damaged either in winter or during spring frosts. Under conditions of the introduction, these plants retain the life form, which is characteristic for their natural habitats: at the age of 40, Korean forsythia bushes have a height of 1.5-2 m, red ash trees - 9-13 m, manchurian ash trees - up to 8 m. Manchurian ash plants, despite being 40 years old, did not have a flowering phase. Plants of Korean forsythia and red ash go through all phases of seasonal development. Based on sixteen years observations, the article presents the dates of the main phenological phases and the sums of effective temperatures at the beginning of flowering and shoot growth. Korean forsythia and red ash successfully bloom and bear fruits, producing high quality seeds (viability 79-91 %). Planting material of these highly decorative species can be grown from local reproduction seeds and be recommended for greening of Krasnoyarsk.