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The paper concerns the dynamics of phytocoenose structure in the early phases of secondary succession in four, spontaneously overgrowing old fields of different age in the Peucedano-Pinetum Mat. (1962) 1973 pine forest habitat (Poland). The studies were conducted during 1980-1982. It was concluded that the following phenomena are characteristic of the succession course:
1) wave-like changes in the number of species, state and spatial structure of biomass, minimum area size, species diversity and per cent of positive and negative interspecific associations; 2) tendency for decrease in species richness, total diversity, evenness and minimum area size; 3) tendency for increase in dominance; 4) directional changes in the floristic composition, i.e. decrease in the number of weed species and increase in the number of pine forest species; 5) gradual stabilization of the qualitative and quantitative structure characteristics.