GROWTH AND CONDITION MONITORING OF SOME SPECIES OF ACER L. GENUS IN SARATOV VOLGA REGION
Article presents the results of long-term studies of three species of Acer L generic complex that show good growth and state in the conditions of Saratov Volga region: A. platanoides L., A. campestre L., A. saccharinum L. Monitoring was conducted in the arboretum of the Agricultural Research Institute of the South-East Region, located in the city of Saratov, where a collection of maples was formed which has no analogues in the region in terms of dendrological composition and age. The studied species grow by biogroups in identical conditions of arid southeast of the European part of Russia. During the work, biometric indicators of plants were measured, rhythms of seasonal and ontogenetic growth and development were studied, phenological observations of vegetative and generative spheres were conducted, a comprehensive assessment of introductory sustainability and integral assessment of viability and prospects of plants under new existence conditions were carried out. In the process of work, the standard techniques of botanical and forestry profile were used. The introduced species were compared with native ones. The result of the work is compiling the ranges according to the degree of reduction of the following indicators: height and diameter, viability, vegetation duration, blooming duration. The complex indicators of introductory sustainability, viability and prospects of A. platanoides L. and A. campestre L. belong to the group of highly resistant plants and group I of perspectivity, and A. saccharinum L. – to resistant plants and group II of perspectivity. On the whole, the observations and research that have been carried out have made it possible to conclude that the plants of the species under study have successfully adapted themselves to the new agroclimatic conditions of Saratov Volga region.