Bidens frondosa L. resource evaluation in the Dnipro River bottomland (in range the forest steppes of Ukraine)

The article concentrates in on the investigation of Bidens frondosa L. resources in the Dnipro River bottomland as a promising substitute of B. tripartitа L. due to its phyto-resources deterioration on the territory of Ukraine. The features of their distribution, ecological and cenotic components, and these species reserve at the most perspective raw material significant territories are identified. Threat factors for B. tripartitа resources are clarified. The research was performed on the basis of the method of registration plots with the subsequent calculation of the biological and operational reserves and the possible volume of the annual collection of dry raw material. Registration plots were diagonally located on the area occupied by the community of species. In the extended areas they are placed as parallel or separated transects. B. frondosa plant raw material reserve is established and their decrease for B. tripartitа is proved. In connection with the increase of B. frondosa resource base, the prospects of using its raw material as a successful substitute of B. tripartitа are justified. Corresponding proposals are submitted to the Ministry of Ecology and Natural Resources of Ukraine.