Estimation of the condition of common birch population (Betula pendula) in specially protected natural territory of south Siberia

In article results of studying of a condition of population Betula pendula in territory of some reserves and national parks of the south of Siberia by means of standard methods of an estimation of fluctuating asymmetry of a sheet plate are resulted. It is shown, that in each population there is a level of natural breaking which can be preserved for a number of years. Extreme influences which lead to essential breaking of a ontogenesis homeostasis, can be both natural and anthropogenous.