The age structure of Acer negundo L. and Fraxinus pennsylvanica Marsh. coenopopulations under different anthropogenic load in the Balashov town flora is studied in the article. The degree of these arboreal advents introduction into the natural phytocenosis is analyzed. The economic assessment of these species is given.
Acer negundo L, Fraxinus pennsylvanica Marsh, phytocenosis Balashovt own
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