Abstract
Knowledge of principal environmental factors is essential for understanding the patterns of changes in species richness (SR) in specially protected natural areas. Species richness regression models have been produced for life forms (LFs) predominant in Samarskaya Luka National Park (hemicryptophytes and geophytes). These models have made it possible to identify solar radiation and topography as the principal environmental factors. SR maps show that LFs are spatially separated, which reduces competition between them. It is established that the SR proportion of therophytes on a site occupied by open forest is three times smaller than that in the Middle Volga region; this reflects the effect of the local species pool in the forest community. The SR spectrum of LFs is described by a geometric progression and geographically associated with active geological fault lines.
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