2026. The ratio of boreal and steppe floristic elements in phytocoenoses involving Populus alba, P nigra, P. tremula and P. × canescens in the Zhaiyk river floodplain. International Journal of Biology and Chemistry. 19, 1 (Jun. 2026), 78–98. DOI:https://doi.org/10.26577/IJBCh20261917.