Tagirova O.V., Kulagin A.YU.
SEASONAL VARIABILITY OF LEAVES BETULA PENDULA ROTH IN EXTREME FOREST VEGETATION CONDITIONS ^{[№ 11 ' 2017]}
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 2^nd 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 3^rd 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 4^th 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 5^th 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.

Kulagin A.Yu., Tagirova O.V.
MONITORING OF TREE PLANTATIONS OF SILVER BIRCH (BETULA PENDULA ROTH) IN TERMS OF THE UFA INDUSTRIAL CENTER ^{[№ 10 ' 2015]}
Research was conducted during the period from 2011 to 2014. In the territory of the city of Ufa 14 constants of the trial areas by standard techniques were put. For definition of the morphological features used for an assessment of stability of development of plantings of a birch (Betula pendula Roth) on each trial square 10 trees were numbered and from each tree during the vegetative season samples of leaves were monthly selected (till 20–30 pieces). The size of an integrated indicator of stability of development of plantings of a birch in the conditions of the Ufa industrial center, both in the territory with industrial pollution, and in the territory with the raised recreational loading is received. The analysis of an integrated indicator of stability of development of separate trees of a birch in plantings in the territory of the Ufa industrial center allowed to reveal considerable distinctions in indicators of asymmetry of sheet plates. The integrated indicator of stability of development of plantings is received. The analysis of results of researches testifies that dynamics of formation of a leaf of a birch is broken. The leaf is formed with deviations. That characterizes reaction of plants to a stress factor. Frequency of occurrence of indicators of stability of development depending on a growth zone was determined. Materials are generalized, the conclusion about frequencies of occurrence of asymmetry depending on pollution zones is made. On the basis of monitoring conclusions are drawn that the condition of wood plantings in the conditions of the Ufa industrial center needs to be investigated with the numbered trees on a network of the constant trial areas.

Tagirov B.B., Yanbaev Yu.A., Tagirova A.A., Redkina H.H.
INDIVIDUAL VARIABILITY OF HEIGHT INCREMENT OF SCOTS PINE`S UNDERGROWTH IN ABANDONED AGRICULTURAL LAND <sup>[№ 10 ' 2015]</sup>
The article contains results of analyses of individual variability of annual height increment of Scots pine (Pinus sylvestris L., Pinaceae). Region of research is presented by forest-steppe of Bashkir Trans-Urals, where in recent decades a large-scale of natural reforestation of Scots pine in out-of-use agricultural land — abandoned arable, hayfields and pastures is occurred. 30 areas of Scots pine`s self-seeding were selected on the territory of Uchaly region of Republic of Bashkortostan on a provisional transect `north-south` length of nearly 100 km. The amount of the annual increment in height in the years 2009–2013 was measured at 4 000 copies of undergrowth (30 plants / year for each test area). The study proved that the variability of a feature within separate reforestation areas is mainly determined by genetic characteristics of undergrowth rather than by environmental conditions.