Структурно-функциональная организация разнообразия видов рода Аlchemilla L. (Rosaceae) на биогеоценотическом уровне с позиций концепции самоподобия

Abstract

Plant community with a high level of Alchemilla-species richness at the edge of oak forest was described through rectangular transect (2 × 9 m, 72 quadrats 0,5 × 0,5 m). On each quadrat for every species the cover (%) was indicated. Number of Alchemilla-species vary on the quadrats from 0 to 5, on the squares (16 quadrats) from 3 to 11. The dependence of species richness from the sample size (number of quadrats) (in the logarithmic form) is approximated well linearly (R2 = 0,80–0,95). So, Alchemilla-diversity is in accordance with principles of self-similarity, what confirms a real entity of these taxa. There are almost no significant correlations between fractal dimension and any ecological factors (neither abiotic nor biotic), probably, because this coefficient depends mostly on heterogeneity at the squares, not on factors by themselves. In comparison with a use of full species composition without Alchemilla-species, an inclusion of the latter increase sufficiently quality of approximation (average R2 rises from 0,91 to 0,95).