Abstract
The results of a comparative analysis of the height and density of pedunculate oak (Quercus robur L.) and small-leafed linden (Tilia cordata Mill.), growing in the low mountains of the western macro slope of the South Ural Mountains, are presented. The study was conducted out in a floodplain oak forest with a composition of 80 % (oak) and 20 % (linden) and a density of 0,4 in windows of the canopy. The shoots and self-seeding of both species were not revealed. The projective cover of plants in all 7 trial plots is close to 100 %. Small (up to 0,5 m) and medium (0,51–1,5 m) undergrowth prevails. The oak dominates in most cases – its share on a 10- point scale is 7,4 ± 0,5 (coefficient of variation 18,3 %), compared with linden (2,4 ± 0,6, 58,9 %). The average height of the oak undergrowth is 64,6 ± 1,2 cm with changes from 20 to 140 cm (coefficient of variation 38,7 %). The growth of linden was almost 1,5 times higher (101,6 ± 1,9 cm), but it varies less (30–175 cm and 27,7 %). Differences in height between the two species are statistically significant (p < 0,001). The oak renewed more abundantly (12,4 ± 2,6 plants per square meter, 1,0 to 18,0 pcs, coefficient of variation 51,8 %) than linden (6,5 ± 1,9 cm, 0,25–13,4 pcs, 72,7 %). Plants with a developmental delay during the reversal and dying off of the main stem were not found. Smallleaved linden, which plays the role of «sod» at the first stage of his life, is currently beginning to inhibit the growth of young oak. The restoration of oak forests under these conditions is impossible without the forestry help (thinning).
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