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Fraction analysis of Kharkov's urbanoflora



Fraction analysis of Kharkov's urbanoflora



Ukrayins'kyi Botanichnyi Zhurnal 53(5): 614-617



The results of Charckov's urbanoflora's investigations, where two main fractions have been singled out, are given. Latent archeophytes, which were considered autochthonous species previously, were included in adventive fraction. The similarity in some features have been noted-for example, prevalence of non-rosette plants in both fractions. At the same time the difference between them is significant: if in the adventive fraction xeromezophytes (31% of fraction's species number), ruderants (35%) and annuals (42%) are in the lead, in the autochthonous one accordingly eumezophytes (30% of the of the autochthonous species number), pratants (26%) and herbacious perennials (70%) occupy such a position. The analysis of living forms, ecological structure of fractions and also their dynamics for the last 100 years (increase of the autochthonous ones) testifies to the tendency of xerophytization and unification in the investigated urbanoflora. The adventive fraction brings in an element of non-stability, stipulated by a high number of terrophytes. The autochthonous one ID some extent serves as a guarantee of flora's stability.

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