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Data characterizing biological productivity of wooden layer in dark coniferous forests secondary succession stands of southern taiga subzone of West Siberian continental sector have been given. Thus, the obtained data prove that ecosystems of the same age group which vary in type of root vegetation forming, developing under the similar vitality conditions (temperature, moisture and nutrition) form different organic matter stores in phytomass. The wooden layer phytomass of secondary birch stands accumulates almost ...