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Effect of species diversity, frequency and spatial distribution on the species-area relationship in an oak forest stand



Effect of species diversity, frequency and spatial distribution on the species-area relationship in an oak forest stand



Annales Botanici Fennici 31(3): 169-178



The decline of oak forest stands in Bialowieza Primeval Forest is accompanied by reduction in the area of the 'island' of thermophilous vegetation and changes in the structure of the ground layer. Investigations carried out on a plot of 512 ml between 1969 and 1992 showed that, during the decline, (1) species with low frequency gradually disappeared from the plot; (2) the spatial homogeneity of the patch increased while the species diversity decreased; (3) mean species frequency and number and proportion of species with aggregated dispersion were negatively correlated with the slope parameter (z) of the power function model S=cA-z; (4) the value of z in the model was inversely proportional to the Shannon diversity index; and (5) the fit of the theoretical model to empirical data was very good and the pattern of the species - area relationship did not change.

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