Main weed species of the Republic of Bashkortostan: position on environmental gradients and agrobiological groups
The paper presents a study of the main weed species in the Republic of Bashkortostan according to the results of a floristic analysis of 1170 geobotanical releves. The authors define 30 species, their constancy is more than 20%. Five species of dicotyledonous and 1 species of monocotyledonous plants Convolvulus arvensis, Chenopodium album, Cirsium setosum, Fallopia convolvulus, Avena fatua, Sonchus arvensis are characterized with the greatest values of occurrence (higher than 50%). According to the results of the ordination analysis and ANOVA the considered species are well differentiated on the gradients of the factors of moistening, richness of the soil and a crop. Among agrobiological groups of weed species the annual and creeping-rooted weeds prevail.