Зависимость флористического разнообразия от ландшафтных особенностей территории на примере лесостепной зоны Самарской области

Abstract

Factors of geographical diversity play an important role in the spatial distribution of the species richness of the flora. The influence of geographical factors on the species diversity of the flora within the Soksky physico-geographical region of the forest-steppe zone (part of the province of the High Zavolzhye, Samara region) is analyzed. The dependence of the change in the number of flora species from the maximum range of the heights (m), the density of the valley-beam network (km / km²), the mean altitude (m) and the surveyed area (km²) is examined. The information basis of the analysis was served by three sections located in various parts of the Sok river basin: the uppermost part of the basin, the middle reaches and the mouth of the river. All three sections differ in the values of the geographic factors in question. Information on the species composition of the flora in the plots was formed on the basis of a series of floral descriptions for each section. The used floral descriptions differ in the number of species, the phytocoenotic confinement of the description, and also the frequency of observation. However, in combination, they give a fairly complete picture of the flora of the sections in question. As a result of the correlation-regression analysis, the equation of the dependence of the number of species of flora on the values of the maximum range of heights and the survey area was obtained. A significant influence of these factors on the species diversity of the flora was revealed. The results of this study are consistent with the data obtained earlier when studying the size of the minimum range of a particular flora for the territory under consideration. The resulting equation can be used in assessing the completeness of the conducted floristic studies for the foreststeppe zone of the Samara region.