Изменение структуры и фитомассы кроны березы повислой (Betula pendula Roth) и березы пушистой (B. pubescens Ehrh. ) в условиях техногенного стресса

The structure, head biomass and leaf parameters of drooping birch (B. pendula) and white birch (B. Pubescens) growing in the natural conditions on the SDPS ash-disposal area are researched. The conclusion that line-ar and weight parameter changes of head and leaf depend on competition load degree in the planting and water and mineral ash content is drawn.