It was investigation on distribution of seven Euro-Siberian plant species on the western borders of their natural ranges in Nizhegorod region. Amygdalus nana L., Cotoneaster melanocarpus Fisch. ex Blytt., Crataegus sanguinea Pall.,Spiraea crenata L. are on the north-west borders. Abies sibirica Ledeb., Larix sibirica Ledeb. et Lonicera caerulea L. are onthe south-west borders. It was ascertained, that Crataegus sanguinea, Larix sibirica et Lonicera caerulea enlarged its rangesat naturalization from cultivation and tinning of forests. Crataegus sanguinea moved on taiga and Larix sibirica moved onforest-steppe. This is analogous their ranges in Siberia. The ranges of Abies sibirica, Amygdalus nana, Cotoneaster melanocarpus and Spiraea crenata remained the same even under the conditions of cultivation. It was supposed, that the reasonof these differences is greater ecological tolerance of first third species. Anthropogenic factors promote reach their natural borders. Moreover, anthropogenic factors can create favorable phytocenotic conditions, but don´t can create favorablephysiographic conditions for others.
Euro-Siberian plant species on the western borders of their natural ranges in Nizhegorod region