Principles of selection of ornamental woody plants assortment for gardens on roofs in conditions of minsk.

摘要

To control woody plants growth and their development in gardens on roofs we studied microclimatic conditions on roof surfaces of buildings with different number of storeys and their influence on 30 species and forms. Fall of substratum temperature till -18-22 degrees C in winter and its heating till 25-33, 4 degrees C in summer are revealed as main limitative factors by growing of woody plants on roofs. There are some typical features for seasonal development of woody plants on roofs in conditions of Minsk such as: increase of vegetation period by majority of taxa, shortening of fruit ripening period, more intensive tonality of leaves autumn colouring. Ability of roots of woody plants for hardening by growing in gardens on roofs is proved. It allows to extend an assortment of commonly used plants. As a result of the research we revealed the main criteria by choosing a range of plants such as: high winter hardiness, especially of root system; compact growth form; high ornamentality perceived within short distance. By such criteria the most suitable for these purposes are ornamental forms of introducted species which were long-tested and showed sufficient steadiness in conditions of Minsk. Adaptive possibilities of plants and developed recommendations on agrotechnics let them preserve high ornamentality by cultivation on roofs within 10-12 years.