SPECIFIC OF POST-AGROGENIC VEGETATION DYNAMIC IN SOUTH TAIGA (KOSTROMA REGOIN)

V. M. Telesnina, E. Yu. Klimovich

Abstract


Vegetation change by natural reafforestation in south taiga (Kostroma region) is studied for two chronological rows – overgrowing hayfi eld and overgrowing arable land. Chronological rows are different in reclamation history and in soil features – the fi rst is formed on loamy soddy-podzolic soil, the second – on sandy podzolic soil. By natural reafforestation on arable land and hayfi eld in south taiga subzone, fl oristic composition of phytocenoces is most diverse by 12–13 years after the last year of agriculture. By vegetation reestablishment, weed-ruderal, nitrophil and mesophyle meadow species of herb layer are gradually replaced by edge-forest and boreal species – the more contrast changes are observed for overgrowing arable land. Reafforestation on neglected arable land on podzolic soil is characterized by vegetation oligotrophizating, it is especially obtained for the stage of forest closing – index of soil nutrient (Ramenskii scale) decreases from 12–14 to 3,5–5,0. For Reafforestation on hayfi eld, oligotrophization is obtained only for last stage (spruce forest). Results of site conditions estimate by Ramensky and Tsyganov ecological scales corresponds with results of soil investigation – soil acidity increases, but supply of nitrogen and nutrient elements decreases by succession. Especially high connection is obtained for plants, acidity index and soil acidity, as well as for index of soil nutrient and available phosphorous content. For overgrowing hayfi eld, such regularity was not obtained. Above-ground biomass of herb (herd-dwarf-shrub) layer decreases by reafforestation on arable land as well as on hayfi eld, as a result of replacing grasses and ruderal tall herdaceous vegetation by dwarfshrubs and boreal species, essential biomass decreasing is observed by 10–13 years.

Keywords


reestablishment of vegetation; post-agrogenic succession; fallow lands; south taiga

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