Long-term dynamics of species of forest plants with different width of ecological niches at permanent plot in pine forest with oaks and lime in Voronezh nature reserve

Changes of species composition of forest plants at permanent plot established 61 year ago in Voronezh Strict Nature Reserve is discussed. Evaluation of site parameters using Ellenberg and Tsyganov ecological scales has been done. Dynamics of stenobionts (specialists) during these years is also described. It is shown that there are no significant changes in soil moisture and acidity, stenobionts portion in relation to these factors is constant in time. Nevertheless soil fertility increased being a result of biocoenos life activity. Plant species specific for more rich sites substitute those ones specific for poor sites.