SEASONAL VARIABILITY OF LEAVES BETULA PENDULA ROTH IN EXTREME FOREST VEGETATION CONDITIONS
The intraspecific and individual variability of wood plants is of interest at assessment of stability and adaptive reactions to extreme conditions of growth. Features of fluctuating asymmetry of leaves of trees of a Betula pendula Roth during the vegetative period in contrast forest vegetation conditions in 2015 are revealed. Differences between averages of two trial areas in July on 1 sign by means of an unpaired student criterion were revealed: P - 0,005, differences between values 0,015 ±0,005, fiducial interval from 0,005 to 0,026. By means of Fischer’s criterion distinctions next months were revealed: in July (F - 2,299, P <0,0001), August (F - 6,409, P <0,0001), September (F - 1,552, P - 0,015). On the 2nd sign differences between averages of two trial areas by means of an unpaired student criterion in September are revealed: P - 0,016, distinctions-0,011±0,005, a fiducial interval from - 0,020 to - 0,002. By means of Fischer’s criterion distinctions are revealed: in June (F - 1,858, P - 0,0011), July (F - 1,812, P - 0,0017), September (F - 2,904, P <0,0001). On the 3rd sign by means of Fischer’s criterion distinctions are revealed: in July (F - 3,512, P < 0,0001), August (F - 1,742, P - 0,0031), September (F - 1,478, P - 0,0266), October (F - 1,799, P - 0,0023). On the 4th sign (Student’s criterion) of distinction in September: P - 0,032, distinctions-0,020±0,009, fiducial interval from-0,038 to-0,002. By means of Fischer’s criterion distinctions are revealed: in August (F - 1,456, P - 0,0315), September (F - 3,795, P <0,0001), October (F - 2,634, P <0,0001). On the 5th sign by means of Fischer’s criterion distinctions are revealed: in July (F - 8,193, P < 0,0001), September (F - 1,975, P - 0,0004). The seasonal dynamism of indexes of fluctuating asymmetry of leaves of trees of a Betula pendula Roth is revealed.