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The intensity of logging was about 25-30 % of the stock. The density of undergrowth on felling areas increased compared with the control, and this increase two years out of four statistically significant for Vatica tonkinensis and Hopea pierrei. The undergrowth of Vatica tonkinensis is different from other species by stable number at logging sites of different year. Hopea pierrei number of undergrowth increases with age of cuttings. The photophilous undergrowth of Erythrophleum fordii, in contrast, has a high density in the 5-7-yearold cuttings area. The density of Madhuca pasquieri is not significantly different from the control. The occurrence of undergrowth is also higher in cutting areas. The total share of four breeds in the total composition of undergrowth is 36-41 % and it doesn't change much with the age of felling. On the control this fact is not observed. The share of undergrowth of Vatica tonkinensis and Hopea pierrei is increasing in logging areas compared to the control. The number of undergrowth of all four species decreases with increasing of height. As a rule, there are a litle bit more small ones at the cutting areas compared to the control irrespective of the species; the largest one has the opposite tendency. In general, in the areas of selective felling with age 5-12 years, the undergrowth of the most valuable tree species differs from the control in the greater density, occurrence and share in the total composition of the undergrowth. Труды Санкт-Петербургского научно-исследовательского института лесного хозяйства № 4, 2019 Key words: selective logging, natural regeneration, the number of undergrowth, the occurrence of undergrowth, the composition of the undergrowth Естественное возобновление леса после выборочных рубок в Центральном Вьетнаме Нгуен Ван Туен, А.П. Смирнов, Д.А. Данилов, Ву Ван Чыонг Цель работы: выявить влияние выборочных рубок на характеристики лесовозобновления в Центральном Вьетнаме. Исследования проведены в 2017 году на участках выборочных рубок в районе Хюнг Кхе, провинция Ха Тинь, на высотах 200-300 м над ур. м. Изучали подрост наиболее экономически ценных видов из I яруса:

An unsymmetrical salen-type Schiff base ligand, (Z)-1-(((2-((E)-(2-hydroxy-6-methoxybenzylidene)amino)phenyl)amino)methylene)naphthalen-2(1H)-one, and its Zn(II), Cu(II), Co(II), Mn(II), and Fe(III) complexes were synthesized and characterized by mass (MS), nuclear magnetic resonance (NMR), infrared (IR), ultraviolet-visible (UV-Vis) spectra, and effective magnetic moments. The thermal analyses of the obtained ligand and metal complexes were conducted by thermogravimetric analysis (TGA). Antimicrobial activity of the unsymmetrical Schiff base ligand and its metal complexes were examined for Staphylococcus aureus as Gram-positive bacteria and Escherichia coli as Gram-negative bacteria. In vitro anticancer property of synthetic compounds was estimated against human cancer cell lines, a subline of Hela tumor cell line (KB), and a human liver cancer cell line (HepG-2) as well.

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