SPECIFIC COMPOUND OF WEEDS IN FOREST NURSERIES OF TAIGA SUBZONE

The experimental data of weed study in forest nurseries of the southern, middle and northern taiga subzone in North-West Russia (including the regions of Vologda, Arkhangelsk and the Republic of Karelia) is viewed in the paper. Research of producing and auxiliary nurseries ’ area, using conventional methods of geobotanical descriptions in the southern taiga subzone was made. Taxonomic, geographic, botanical and ecological distribution of segetal species is explained. Weed flora of the forest nurseries showed great diversity of species’ composition and included 209 species belonging to 110 genera and 33 families. The role of the head families in the nursery is 77 % of the total species, it shows significant degree of anthropogenic transformation of the flora. The absolute number of indicators and systematic floristic diversity tend to increase in the direction from north to south and from west to east. Key words: forest nursery, segetal flora, weed vegetation, analysis of flora In forest nurseries there is a competitive interaction between coniferous seedlings and saplings, and weed species. Forest vegetation management is about supporting the survival and growth of the cultivated species by changing the competitive interaction in favour of the cultivated ones. This can be done by reducing the competitive strength of undesired species or enhancing the competitive strength of the cultivated species, or both. There is no unique definition of ‘weed’, but it is commonly considered to be an undesirable plant specie