Loza I. The ecological-biological characteristic of small insular groves of aspen or birch, their protection and rational use.

In work the ecological role of an aspen and birch in formation of wood ecosystems of a steppe zone of Ukraine is investigated. The laws of distribution of these breeds in the basic types of a landscape are investigated. The considered of settling by an aspen on the loess eroded soils, the application of an aspen for creation artificial phytocoenosis is recommended with the purpose of fas-tening soils. Is constructed the genetic line of change of the types of soils and of woods in time depending on the change of a hydrological mode. The analysis of group and common humus is carried out. Are methods of mathe-matical statistics has allowed to reveal the tendencies in distribution on the soils profile of chemical components. The necessity of protection and rational use of small in-sular groves of aspen or birch as unique natural object is proved.